Welcome to the Heterogeneous Catalysis Research Group (HCRG)
Our research strives to elucidate catalytic phenomena in a variety of systems. Current research includes development of novel catalytic materials for fuel cell applications, catalytic water treatment, high-temperature electrocatalysis of oxidation reactions, high-temperature electrocatalytic NH3 production, electrocatalytic carbon dioxide and water reduction, fuel reformulation for hydrogen production, oxidation catalysis, hydrogenolysis, and hydrogenation.
Umit S. Ozkan is a College of Engineering Distinguished Professor and the Chair of the Chemical and Biomolecular Engineering Department at The Ohio State University. She has been on the faculty of Chemical Engineering since 1985. Between 2000 and 2005, she also served as the Associate Dean for Research in the College of Engineering. She held Visiting Scientist and Visiting Professor positions at the French Institut de Recherches sur la Catalyse (Catalysis Research Institute) Centre National de la Recherche Scientifique (CNRS) and Université Claude Bernard, respectively. She received her B.S. (1978) and M.S. (1980) degrees from the Middle East Technical University in Turkey and her Ph.D. (1984) from Iowa State University.
Dr. Ozkan’s current research interests are focused on heterogeneous catalysis and electro-catalysis. She has edited eight books, has written over 250 refereed publications and book chapters, given over 350 conference presentations and over 150 invited lectures in 25 different countries. She has seven patents and over 12,000 citations.
Professor Ozkan has held and continues to hold many leadership positions in several professional organizations, including American Institute of Chemical Engineers, American Chemical Society and the North American Catalysis Society. She is on the Editorial Boards of Catalysis Today, Journal of Molecular Catalysis, Catalysis Letters, Journal of Catalysis, Topics in Catalysis, The Royal Society of Chemistry, Catalysis Book Series, Applied Catalysis B, ACS Applied Energy Materials and Catalysis Reviews in Science and Engineering, ACS Catalysis and Nature Sustainability. Dr. Ozkan is a Professional Engineer registered in Ohio. She is a fellow of the American Association for the Advancement of Science (AAS), American Institute of Chemical Engineers (AICHE), and American Chemical Society (ACS).
High-temperature electrocatalytic production of NH3 from N2 and H2O at atmospheric pressure in which the only byproduct is pure oxygen will allow a path for less energy-intensive, economically more feasible and environmentally friendlier production of ammonia compared to Haber-Bosch process.
Ozkan group developed composite cathodes that contain two phases, i.e., perovskite oxide and metal nitride/oxynitride to provide oxygen and nitrogen mobility/activation on the electrode surface for electrocatalytic NH3 synthesis from N2 and H2O. A patent was filed for the development of these composite cathodes.
Co-electrolysis of CO2 and H2O in an SOEC is an efficient renewable technology to produce synthesis gas.
The main challenge in the construction of an efficient SOEC lies in the development of a suitable cathode catalyst. A cathode catalyst should be coke resistant, thermally stable and have high electrical and ionic conductivity. A- and/or B-site doped lanthanum ferrite type perovskite oxides were synthesized and tested for co-electrolysis reaction.
Solid oxide electrochemical cell (SOEC)-type reactors provide a controlled oxygen ion flux to the reaction, thus improve the desired product (olefin) selectivity by suppressing the complete oxidation of the reactants and products in Electrocatalytic Oxidative Coupling of Methane (OCM) and Oxidative Dehydrogenation of Alkanes (ODH).
Electrocatalytic Oxidative Coupling of Methane (OCM)
Electrocatalytic Oxidative Dehydrogenation (ODH) of Alkanes
Ever-increasing energy demands and environmental concerns necessitate the development of technologies that are clean, efficient and environmentally friendly such as hydrogen-based proton exchange membrane (PEM) fuel cells. One of the technological challenges identified here is the slow kinetics of the oxygen reduction reaction (ORR) at the cathode. Platinum-based catalysts currently used to catalyze ORR suffer from their high costs, limited availability and susceptibility to the presence of poisons in the fuel.
Our research effort has focused on development of alternative metal-free electrocatalyst materials for PEM fuel cells and regenerative fuel cells such as nitrogen-doped carbon nanostructures (CNx).
We perform electrocatalytic measurements to investigate the potential of using heteroatom-doped carbon-based materials as both anode and cathode catalysts for electrochemical bromine production. Significant energy savings can be attained by an alternative oxygen depolarized cathode (ODC)-based process where oxygen is reduced at the cathode instead of protons.
This project focuses on tailoring the composition of CNx for the bromine evolution reaction (BER) on the anode side, by systematically modifying the synthesis procedure and parameters. This work also involves developing a fundamental understanding of the effect of halide exposure on the ORR activity of CNx to be used on the cathode side as well.
Groundwater contamination due to organic compounds such as polychlorinated and aromatic hydrocarbons is a cause for concern as these compounds pose serious risks to human health and the environment due to their toxicity. Conventional physical remediation techniques such as air stripping and adsorption just transfer the contaminants from water to another phase (gas/solid) without degrading them whereas, biological processes fail to degrade these organics effectively owing to their toxicity. As a promising alternative, we are employing catalytic hydrogenation & hydrogenolysis to degrade toxic molecules such as toluene and trichloroethylene to benign products.
Our research is focused on investigating a new class of silica-based material, known as swellable organically modified silica (SOMS), for its applicability as a catalytic support in aqueous phase hydrogenation and hydrogenolysis systems. SOMS is a hydrophobic material that can swell to more than three times its original volume when exposed to organics. Its high affinity for organics helps in concentrating the contaminants in the pores of the catalyst thus favoring the kinetics of the reaction. Hydrophobicity of SOMS was found to repel ionic species present in groundwater thereby, protecting the precious-metal sites from deactivation.
Non-renewable resources such as petroleum, natural gas and coal have been the major source of fuels and chemicals for the past few centuries. However, recently, growing energy demand and the depletion of fossil fuels have created a need for sustainable alternatives. Biofuels i.e., fuels derived from renewable feedstock such as biomass are a renewable energy source and hence, have been studied extensively by many researchers.
Lignocellulosic biomass is converted to bio-oil by fast pyrolysis. Bio-oil is a complex mixture of compounds such as carboxylic acids, ethers, ketones, aldehydes, phenols, nitrogen and sulfur-containing compounds. High oxygen content (30-50%) and high moisture content (15-30%) lower the energy density of bio-oil (16-20 MJ/kg) as compared to crude (35-40 MJ/kg). Hence, further processing of bio-oil is necessary for blending biofuels with conventional petroleum fuels. Hydrodeoxygenation (HDO) is most applied to upgrade bio-oil as it removes oxygen without affecting the C/H ratio.
Our research focuses on studying HDO of phenolic compounds such as phenol and m-cresol utilizing SOMS as the catalyst support. This was motivated by our previous studies wherein we explored the effect of the unique properties of SOMS such as hydrophobicity and swellability on the reaction kinetics of hydrodechlorination.
RESOURCES
Funding Sources
The Heterogeneous Catalysis Research Group receives financial support from a variety of funding sources both locally and nationally. We would like to thank the following sources for their support throughout the years:
Department of Energy - Basic Energy Science
Ohio Department of Development
The Ohio 3rd Frontier Project: Wright Fuel Cell Center of Innovation
PUBLICATIONS
OZKAN GROUP FOR HETEROGENEOUS CATALYSIS
For more information about our publications and citations, visit us on Google Scholar.
Umit S. Ozkan
2022
J Kim, YJ Kim, M Ferree, S Gunduz, AC Co, M Kim, US OzkanIn-situ exsolution of bimetallic CoFe nanoparticles on (La,Sr)FeO3 perovskite: its effect on electrocatalytic oxidative coupling of methane", Applied Catalysis B: Environmental 321, 122026.
A Hunoor, S Patil, PL Edmiston, US Ozkan, "Animated organic-inorganic hybrid materials and their use as catalyst scaffolds", Catalysis Today, online available Oct. 2022.
Deeksha Jain, Jonathan Hightower, Dishari Basu, Vance Gustin, Qiang Zhang, Anne C Co, Aravind Asthagiri, Umit S Ozkan, "Highly active nitrogen-doped carbon nanostructures as electrocatalysts for bromine evolution reaction: A combined experimental and DFT study", Journal of Catalysis 413, 1005-1016.
Saurabh Ailawar, Anagha Hunoor, Dishari Basu, Benjamin Rudzinski, Laurence Burel, Jean-Marc M Millet, Jeffrey T Miller, Paul L Edmiston, Umit S Ozkan, "Aqueous phase hydrodechlorination of trichloroethylene using Pd supported on swellable organically modified silica (SOMS): Effect of support derivatization", Journal of Catalysis 411, 15-30.
S Gunduz, DJ Deka, M Ferree, J Kim, JMM Millet, US Ozkan, " Composite cathodes with oxide and nitride phases for high-temperature electrocatalytic ammonia production from nitrogen and water", ECS Advances 1 (1), 014501.
J Kim, M Ferree, S Gunduz, JMM Millet, M Aouine, US Ozkan, "Exsolution of nanoparticles on A-site-deficient lanthanum ferrite perovskites: its effect on co-electrolysis of CO2 and H2O", Journal of Materials Chemistry A 10 (5), 2483-2495.
2021
Deka, D.J., Kim, J., Gunduz, S., Jain, D., Shi, Y., Miller, J., , Co, A.C., Ozkan, U.S., ”Coke formation during high-temperature CO2 electrolysis over AFeO3 (A=La/Sr) cathode: Effect of A-site metal segregation”, Applied Catalysis B: Environmental 283, 119642
Deka, D.J., Kim, J., Gunduz, S., Aouine, M., Miller, J., Milllet, J-M., Co, A.C., Ozkan, U.S., “Investigation of Hetero-phases Grown In-situ on a Ni-doped (La,Sr)FeO3 Cathode and the Resultant Activity Enhancement in CO2 Reduction”, Applied Catalysis B: Environmental, 286, 119917 (2021).
S Ailawar, A Hunoor, Y Khalifa, JT Miller, PL Edmiston, US Ozkan, "Elucidating the role of ethanol in aqueous hydrodechlorination of trichloroethylene over Pd catalysts supported on swellable organically modified silica (SOMS)", Applied Catalysis B: Environmental 285, 119819
Gunduz, S., Deka, J., Kim, J., Wilson, M. Warren, M., Ozkan, U.S., “Incident-angle Dependent Operando XAS Cell Design: Investigation of the Electrochemical Cells Under Operating Conditions at Various Incidence Angles”, RSC Advances, 2021, 11, 6456-6463.
Ailawar, S., Hunoor, A., Rudzinski, B., Celik, G., Burel, L., Millet, J-M.J, Miller, J.T., Edmiston, P.L., Ozkan, U.S.,”On the Dual Role of the Reactant during Aqueous Phase Hydrodechlorination of Trichloroethylene (HDC of TCE) using Pd supported on Swellable Organically Modified Silica (SOMS)” Applied Catalysis B: Environmental. 291 (2021)
2020
Jain, D., Zhang, Q., Gustin, V., Hightower, J., Gunduz, S., Co, A.C., Miller, J.T., Asthagiri, A., Ozkan, U.S., “An Experimental and DFT Investigation into Chloride Poisoning Effects on Nitrogen-Coordinated-Iron-Carbon (FeNC) Catalysts for Oxygen Reduction Reaction” The Journal of Physical Chemistry C. 124(19), 10324–10335 (2020).
Ailawar, S., Hunoor, A., Khalifa, Y., Miller, J.T., Edmiston, P.L., Ozkan, U.S., “Elucidating the Role of Ethanol in Aqueous Phase Hydrodechlorination of Trichloroethylene over Pd Catalysts Supported on Swellable Organically Modified Silica (SOMS)”, Applied Catalysis B: Environmental. 285 119819 (2020).
Gunduz, S., Deka, D.J., Ozkan, U.S., “A Review of the Current Trends in High-temperature Electrocatalytic Ammonia Production Using Solid Electrolytes,” Journal of Catalysis, 387, 207–216 (2020).
Jain, D., Ozkan, U.S., “Electrocatalytic Applications of Heteroatom-doped Carbon Nanostructures: Thinking Beyond PEM fuel Cells”, Catalysis Book Series, Royal Society of Chemistry. Catalysis, 32, 44–80 (2020) DOI: 10.1039/9781788019477-00044.
Basu, D., Ailawar, S., Celik, G., Edmiston, P., Ozkan, U.S., “Effect of High Temperature on Swellable Organically Modified Silica (SOMS) and Its Application for Preferential CO Oxidation in H2 Rich Environment,” ChemCatChem, 12, 1–17 (2020).
Deka, D.J., Gunduz, S., Kim, J., Feree, M., Co, A.C., Ozkan, U.S., “Temperature-induced changes in the synthesis gas composition in a high-temperature H2O and CO2 co-electrolysis system,” Applied Catalysis A., 602, 602 (2020).
Jain, D., Gustin, V., Basu, D., Gunduz, S., Deka, D.J., Co, A.C., Ozkan, U.S.,“Phosphate Tolerance of Nitrogen-Coordinated-Iron-Carbon (FeNC) Catalysts for Oxygen Reduction Reaction: A Size-related Hindrance Effect,” Journal of Catalysis, 390, 150–160 (2020).
Jain, D., Zhang, Q., Gustin, V., Hightower, J., Gunduz, S., Co, A.C., Miller, J.T., Asthagiri, A., Ozkan, U.S., “An Experimental and DFT Investigation into Chloride Poisoning Effects on Nitrogen-Coordinated-Iron-Carbon (FeNC) Catalysts for Oxygen Reduction Reaction” The Journal of Physical Chemistry C, 124(19), 10324–10335 (2020).
2019
Gunduz, S., Dogu, D., Deka, D.J., Meyer, K.E., Fuller, A., Co, A.C., Ozkan, U.S., “Application of Solid Electrolyte Cells in Ion Pump and Electrolyzer Modes to Promote Catalytic Reactions: An Overview”. Catalysis Today, 323, 3–13, (2019). https://doi.org/10.1016/j.cattod.2018.08.008
Olson, N., Deshpande, N., Gunduz, S., Ozkan, U.S., Brunelli, N.A., “Utilizing Imogolite Nanotubes as a Tunable Catalytic Material for the Selective Isomerization of Glucose to Fructose,” Catalysis Today, 323, 69-65 (2019). https://doi.org/10.1016/j.cattod.2018.07.059.
Dogu, D., Sohn, H., Bhattacharya, Cornelius, C., and Ozkan., U.S., “Using Volatile Organic Compounds in Waste Streams as Fuel, ”International Journal of Chemical Reactor Engineering,” (2019) https://doi.org/10.1515/ijcre-2018-0252.
Celik, G., Ailawar, S., Gunduz, S., Edmiston, P.L, Ozkan, U.S., “Formation of Carbonaceous Deposits on Pd-based Hydrodechlorination Catalysts: Vibrational Spectroscopy Investigations over Pd/Al2O3 and Pd/SOMS,” Catalysis Today, 323, 129-140 (2019). https://doi.org/10.1016/j.cattod.2018.05.001.
Deka, D.J., Gunduz, S., Fitzgerald, T., Miller, J. T., Co, A.C., Ozkan, U.S., “Production of syngas with controllable H2/CO ratio by high temperature co-electrolysis of CO2 and H2O over Ni and Co- doped lanthanum strontium ferrite perovskite cathodes,” Applied Catalysis B, 248, 487-503 (2019).
Sinha Majumdar, S., Alexander, A.-M., Gawader, P., Celik, G., Ozkan, U.S., “Effect of alumina incorporation on the sulfur-tolerance of the dual-catalyst aftertreatment system for reduction of nitrogen oxides under lean conditions,” Catalysis Today, 320 204-213 (2019). doi.org/10.1016/j.cattod.2018.01.027.
Celik, G., Ailawar, S., Gunduz, S., Miller, J.T., Edmiston, P.L, Ozkan, U.S., “Aqueous-phase Hydrochlorination of Trichloroethylene over Pd-based Swellable Organically Modified Silica: Catalyst Deactivation Due to Sulfur Species,” I&EC Research, 58(10), 4054-4064 (2019). DOI: 10.1021/acs.iecr.8b05979
Dogu, D., Gunduz, G.,. Meyer, K.E., Deka, D. J., Co, A.C.,and and Ozkan., U.S., “CO2 and H2O Electrolysis Using Solid Oxide Electrolyzer Cell (SOEC) with La and Cl- doped Strontium Titanate Cathode,” Catalysis Letters, 149(7), 1743-1752 (2019)
Jain, D., Ozkan, U.S., “Electrocatalytic Applications of Heteroatom-doped Carbon Nanostructures:Thinking Beyond PEM fuel Cells”, Catalysis Book Series, Royal Society of Chemistry submitted.
Deka, D.J., Gunduz, S., Kim, J., Fitzgerald, T., Shi, Y., Co, A.C., Ozkan, U.S., “Hydrogen Production from Water in a Solid Oxide Electrolysis Cell: Effect of Ni Doping on Lanthanum Strontium Ferrite Perovskite Cathodes” Submitted to Special Issue of I&EC Research, Chuck Eckert Festschrift.
Deka, D.J., Gunduz, S., Ozkan, U.S., “Advances in High Temperature Electrocatalytic Reduction of CO2 and H2O,” accepted Advances in Catalysis.
2018
Mamtani, K., Jain, D., Dogu, D., Gustin, V., Gunduz, S., Co, A., Ozkan, U.S., “Insights into Oxygen Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER) Active Sites for Nitrogen-doped Carbon Nanostructures (CNx) in Acidic Media,”. Applied Catalysis B.220, 88-97 (2018). https://doi.org/10.1016/j.apcatb.2017.07.086
Dogu, D., Meyer K. E., Fuller A., Gunduz. S., Deka, D.J., Kramer, N., Co, A.C., Ozkan, U.S.,”Effect of Lanthanum and Chlorine Addition on Strontium Titanates for Electrocatalytically-Assisted Oxidative Dehydrogenation of Ethane,” Applied Catalysis B. 227, 90-101 (2018) https://doi.org/10.1016/j.apcatb.2018.01.019
Deeksha, J., Mamtani, K., Gustin, V., Gunduz, S., Celik, G., Waluyo, I., Hunt, A., Co, A., Ozkan, U.S., “Effect of Chloride Exposure on Oxygen Reduction Reaction Activity of Nitrogen-doped Carbon Nanostructures,” ChemElectroChem., 5, 1-11 (2018).
Mamtani, K., Singh, D., Dogu, D. Jain, D., Millet, J.-M., Ozkan, U.S., “Effect of Acid-washing on the Nature of Bulk Characteristics of Nitrogen-doped Carbon Nanostructures (CNx) as Oxygen Reduction Reaction (ORR) Electrocatalysts in Acidic Media,” Energy&Fuels, 32(10), 11038-11045. DOI: 10.1021/acs.energyfuels.8b01510
Sinha Majumdar, S., Alexander, A.-M., Gawader, P., Celik, G., Ozkan, U.S., “Effect of alumina incorporation on the sulfur-tolerance of the dual-catalyst aftertreatment system for reduction of nitrogen oxides under lean conditions,” Catalysis Today. (2018). doi.org/10.1016/j.cattod.2018.01.027. 2018
Celik, G., Ailawar, S., Gunduz, S., Edmiston, P.L, Ozkan, U.S., “Formation of Carbonaceous Deposits on Pd-based Hydrodechlorination Catalysts: Vibrational Spectroscopy Investigations over Pd/Al2O3 and Pd/SOMS”, Catalysis Today. (2018). https://doi.org/10.1016/j.cattod.2018.05.001.
Celik, G., Ailawar, S., Sohn, H., Tang, Y., Feng, F.,Miller, J.T., Edmiston, P.L., Ozkan, U.S., “Swellable Organically Modified Silica (SOMS) as a Catalyst Scaffold for Catalytic Treatment of Water Contaminated with Trichloroethylene,”ACS Catalysis, 8, 6796-6809 (2018) DOI:10.1021/acscatal.8b01700.
Celik, G., Ailawar, S., Gunduz, S., Miller, J.T., Edmiston, P.L., Ozkan, U.S., “Aqueous-Phase Hydrodechlorination of Trichloroethylene over Pd-based Swellable Organically-Modified Silica (SOMS): Catalyst Deactivation Due to Chloride Anions,” Applied Catalysis B. 239, 654-664 (2018).
Gunduz, S., Dogu, D., Deka, D.J., Meyer, K.E., Fuller, A., Co, A.C., Ozkan, U.S., “Application of Solid Electrolyte Cells in Ion Pump and Electrolyzer Modes to Promote Catalytic Reactions: An Overview”. Catalysis Today. accepted. https://doi.org/10.1016/j.cattod.2018.08.008
Olson, N., Deshpande, N., Gunduz, S., Ozkan, U.S., Brunelli, N.A., “Utilizing Imogolite Nanotubes as a Tunable Catalytic Material for the Selective Isomerization of Glucose to Fructose,” Catalysis Today. Accepted. https://doi.org/10.1016/j.cattod.2018.07.059
Gunduz, S. Deka, D.J., Ozkan, U.S., “Advances in high-temperature electro-catalytic reduction of CO2 and H2O,” Advances in Catalysis. 62, 113-165 (2018) https://doi.org/10.1016/bs.acat.2018.08.003
Deka, D.J., Gunduz, S., Fitzgerald, T., Miller, J. T., Co, A.C., Ozkan, U.S., “Production of syngas with controllable H2/CO ratio by high temperature co-electrolysis of CO2 and H2O over Ni and Co- doped lanthanum strontium ferrite perovskite cathodes,” submitted to Applied Catalysis B.
2017
Sinha Majumdar, S., Alexander, A-M., Celik, G., Gawade, P., Ozkan, U.S., “In-situ incorporation of binder during sol-gel preparation of Pd-based sulfated zirconia for reduction of nitrogen oxides under lean-burn conditions: Effect on activity and wash-coating characteristics,” Applied Catalysis B. 202, 134-146 (2017).
Sohn, H., Celik, G., Gunduz, S., Dean, S.L., Painting, E., Paul L. Edmiston, P.L., and Ozkan, U.S., “Hydrodechlorination of Trichloroethylene over Pd Supported on Swellable Organically-Modified Silica (SOMs)”. Applied Catalysis, B. 203, 641-653 (2017).
Sohn, H., Celik, G., Gunduz, S., Sinha Majumdar S., Dean, S.L, Edmiston, P.L., and Ozkan, U.S.,”Effect of High-temperature on the Swellable Organically-Modified Silica (SOMS) and Its Application to Gas-Phase Hydrodechlorination of Trichloroethylene” Applied Catalysis B.209, 80-90 (2017). doi.org/10.1016/j.apcatb.2017.02.056
Mamtani, K., Jain, D, Shankaran, K., Co, A., Ozkan, U.S., “Nitrogen-coordinated iron-carbon (FeNC) Materials as Efficient Bifunctional Electrocatalysts for Oxygen Reduction Reaction and Oxygen Evolution Reaction in Acidic Media,” Energy and Fuels, 31(6), 6541–6547 (2017).
Dogu, D., Meyer K. E., Fuller A., Gunduz. S., Deka, D.J., Kramer, N., Co, A.C., Ozkan, U.S.,”Effect of Lanthanum and Chlorine Addition on Strontium Titanates for Electrocatalytically-Assisted Oxidative Dehydrogenation of Ethane,” submitted to Applied Catalysis B.
Mamtani, K., Jain, D., Co, A., Ozkan, U.S., “Investigation of Chloride poisoning for Carbon-based Materials as Oxygen Depolarized Cathode Catalysts in Acidic Media,” submitted to Catalysis Letters.
Mamtani, K., Jain, D., Dogu, D., Gustin, V., Gunduz, S., Co, A., Ozkan, U.S., “Insights into Oxygen Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER) Active Sites for Nitrogen-doped Carbon Nanostructures (CNx) in Acidic Media,”. Accepted to Applied Catalysis B. https://doi.org/10.1016/j.apcatb.2017.07.086
Mamtani, K., Bruening, C., Co, A., Ozkan, U.S., “A Comparison of Oxygen Reduction Reaction (ORR) Performance for Iron-nitrogen-carbon (FeNC) Catalysts in Acidic and Alkaline Media,” Accepted to Research & Reviews in Electrochemistry.
Sohn, H., Celik, G., Gunduz, S., Dogu, Zhang, S., Shan, J., (Feng) Tao,F., and Ozkan, U.S., “Oxygen Mobility in Pre-reduced Nano- and Macro-ceria with Co loading: An AP-XPS, in-situ DRIFTS and TPR Study, “ Accepted to Catalysis Letters.
Sinha Majumdar, S., Alexander, A.-M., Gawader, P., Celik, G., Ozkan, U.S., “Sulfur-tolerance of the dual-catalyst aftertreatment system for reduction of nitrogen oxides under lean conditions,” submitted to Catalysis Today.
2016
Soykal, I.I., Matter, P.H., Thrun, L., Long, R., Swartz, S., Ozkan, U.S., “Amperometric NOx Sensor Based on Oxygen Reduction,” IEEE Sensors.16(6), 1532-1540 (2016).
Johnson, G.B., Hjalmarsson, P., Norrman, K., Ozkan, U.S., Hagen, A., “Biogas catalytic reforming studies on nickel based solid oxide fuel cell anodes” Fuel Cells 16, 218-234 (2016).
Sohn, H. Ozkan, U.S., “Cobalt-based Catalysts for Ethanol Steam Reforming: An Overview,” Energy and Fuels, 30 (7), pp 5309–5322 (2016).
Sohn, H., Soykal, I.I., Zhang, S., Shan, J., Tao, F., Miller, J.T., Ozkan. U.S., “Effect of Cobalt on Reduction Characteristics of Ceria under Ethanol Steam Reforming Conditions: In-situ AP-XPS and XANES Studies”. J. Physical Chemistry, C, 20, 14631-14642 (2016).
Mamtani, K., Singh, D., Millet, J-M., Miller, J.T., Co, A. C., Ozkan, U.S., “Evolution of FeNC catalysts through synthesis stages.” Catal Lett. 146, 1749-1770, (2016).
Zhang, Q., Mamtani, K., Jain, D. Ozkan, U.S., Asthagiri, “CO Poisoning Effects on FeNC and CNx ORR Catalysts: A Combined Experimental− Computational Study” J. of Physical Chemistry, C, 20, 15173-15184 (2016).
Mamtani, K., Jain, D., Zemylanov, G., Celik, G., Luthman, J., Renkes, G., Co, A., Ozkan, U.S., “Probing the ORR Active Sites Over Nitrogen-doped Carbon Nanostructures (CNx) in Acidic Media Using Phosphate Anion” ACS Catal. 6, 7249-7259 (2016).
Sinha Majumdar, S., Celik, G., Ozkan, U.S., “Investigation of the effect of alumina binder addition to Pd/SO42--ZrO2 catalysts during sol-gel synthesis,” Industrial and Engineering Chemistry Research, 55 (44), 11445–11457 (2016).
2015
Mamtani, K. and Ozkan, U.S., “Heteroatom-doped Carbon nanostructures as Oxygen Reduction Reaction Catalysts in Acidic Media: An Overview." Catalysis Letters, Silver Anniversary Special Issue 145, 436-450 (2015).
Zhao, Z., Lakshminarayanan, N., Swartz, S.L., Arkenberg, G.B., Felix, L.G., Slimane, R. B., Choi, C.W., Ozkan, U.S., “Characterization of olivine-supported nickel silicate catalyst for tar removal from biomass gasification,” Applied Catalysis A, 489, 42-50 (2015)
Choi, H., Fuller, A., Dogu, D., Binkley, K.E., Davis, J., Co, A., Ozkan, U.S., “Effect of Ce doping on the performance and stability of strontium cobalt ferrite perovskites as SOFC anode catalysts,” Topics in Catalysis. 58:359–374 (2015).
Soykal, I.I., Sohn, H., Bayram, B., Gawade, P. Snyder, M.P.Stephen E. Levine, Oz, H. and Ozkan, U.S.“Effect of Microgravity on Synthesis of Nano Ceria,” Catalysts 5(3), 1306-1320 (2015).
2014
Soykal, I.I., Sohn, H., Miller, J.T., Ozkan, U.S., “Reduction characteristics of ceria under ethanol steam reforming conditions: Effect of the particle size,” ACS Catalysis. 4 (2), 585–592 (2014).
Soykal, I.I., Sohn, H., Miller, J.T., Ozkan, U.S., “Investigation of the Reduction/Oxidation Behavior of Cobalt Supported on Nano-ceria,” Topics in Catalysis, 57, 785-795 (2014).
Singh, D., Tian, J., King, J., Mamtani, K., Miller, J.T., Ozkan, U.S., “A comparison of N-containing Carbon Nano-structures (CNx) and N-coordinated Iron-Carbon Catalysts (FeNC) for the Oxygen Reduction Reaction in Acidic Media” Journal of Catalysis, 317, 30-43 (2014).
Singh, D., Mamtani, K., Miller, J.T., Ozkan, U.S., “Use of H2S to Probe the Active Sites in FeNC Catalysts for the Oxygen Reduction Reaction (ORR) in Acidic Media” ACS Catalysis. 4, 3454-3462 (2014)
Chen, X., Liu,Y-S., Anne-Marie Alexander,A-M., Gallucci,, J.C., Hwang, S-J., Lingam,H.K., Huang, Z., Wang,C., Li,H., Zhao,Q., Ozkan, U.S., Shore, S.G., and Zhao, J-C. “Desolvation and dehydrogenation of solvated magnesium salts of dodecahydrododecaborate: relationship between structure and thermal decomposition”. Chemistry- A European Journal. 20(24), 7325-7333 (2014).
2013
Singh, D., Soykal, I.I., von Deak, D., Tian, J., King, J., Miller, J.T., Ozkan, U.S., “In-situ characterization of the growth of CNx carbon nano-structures as oxygen reduction reaction catalysts,” Journal of Catalysis 301, 100-111 (2013).
Bao, X., Nie, X., von Deak, D., Biddinger, E.J., Luo, W., Asthagiri, A., Ozkan, U.S., Hadad, C.M., “A first-principles study of the role of quarternary-N doping on the oxygen reduction reaction activity and selectivity of graphene edge sites,” Topics in Catalysis. 56 (18-20), 1623-1630 (2013).
Ozkan, U.S., “Bridging Heterogeneous Catalysis and Electro-catalysis: Catalytic Reactions Involving Oxygen,” Topics in Catalysis. 56 (18-20), 1603-1610 (2013).
Ji, Z. ,He, M., Huang, Z.,Ozkan, U.,and Wu, Y., “Photostable p‑Type Dye-Sensitized Photoelectrochemical Cells for Water Reduction,” J. Am. Chem. Soc. 135, 11696−11699 (2013).
2012
Von Deak, D., Singh, D., Biddinger, E.J., King, J.C., Bayram, B., Miller, J.T., Ozkan, U.S., “Investigation of sulfur poisoning of CNx oxygen reduction catalysts for PEM fuel cells,” Journal of Catalysis. 285, 145-151 (2012).
Von Deak, D. Singh, D., King, J.C., Ozkan, U.S., “Use of carbon monoxide and cyanide to probe the active sites on nitrogen-doped carbon catalysts for oxygen reduction,” Applied Catalysis, B. 113-114, 126-133 (2012).
Song, H., Zhang, L., Ozkan, U.S., “The effect of Surface Acidic and Basic Properties on Ethanol Steam Reforming Performance of Co-based Catalysts,” Topics in Catalysis. 55, 1324-1331 (2012).
Gawade, P., Bayram, B., Ozkan, U.S., “Preferential oxidation of CO (PROX) over CoOx/CeO2 in Hydrogen-rich Streams: Effect of Cobalt Loading,” Applied Catalysis B. 128, 21-30 (2012).
Gawade,P.,Alexander, A.M., Clark, R. and. Ozkan, U.S., “The role of oxidation catalyst in dual catalyst after-treatment of lean-burn natural gas engine exhaust”, Catalysis Today. 197, 127-136 (2012).
Soykal, I.I., Sohn, H., Bayram, B., Gawade, P., Miller, J.T., Ozkan, U.S., “Ethanol steam reforming over Co/CeO2 catalysts: Investigation of the effect of ceria morphology, ” Applied Catalysis A. 449 47-58 (2012).
Gawade,P., Alexander, A.M., Silver, R., and Ozkan, U.S., “Effect of engine exhaust parameters on the hydrothermal stability of hydrocarbon-selective catalytic reduction (SCR) catalysts for lean-burn systems,” Energy and Fuels, 26(12) 7084-7091 (2012).
Choi, H., Fuller, A., Davis, J., Wielgus, C., Ozkan, U.S., “Ce-doped strontium cobalt ferrite perovskites as cathode catalysts for solid oxide fuel cells: Effect of dopant concentration” Applied Catalysis B. 127, 336-341 (2012).
Soykal, I.I., Sohn, H., Ozkan, U.S., “Effect of Support Particle Size in Steam Reforming of Ethanol over Co/CeO2 Catalysts” ACS Catalysis. 2(1) 2335-2348 (2012)
2011
Song, H. Bao, X., Hadad, C., and Ozkan, U.S., “Adsorption/desorption Behavior Ethanol Steam Reforming Reactants and Intermediates over Supported Cobalt Catalysts,” Catalysis Letters, 141, 43–54 (2011).
Lakshminarayanan, N. and Ozkan, U.S., “Effect of H2O on Sulfur poisoning and catalytic activity of Ni-YSZ catalysts,” Applied Catalysis A. 393,138–145 (2011).
Ledesma, C., Ozkan,U.S., Llorca, J., “Hydrogen Production By Steam Reforming of Dimethyl Ether Over Pd-Based Catalytic Monoliths,” Applied Catalysis. 101, 690-697 (2011).
Biddinger, E.J., von Deak, D., Singh, D., Marsh, H., Knapke, D.S., Ozkan, U.S., “Examination of catalyst loading effects on the selectivity of CNx and Pt/VC ORR catalysts using RRDE” Journal of Electrochemical Society, 158 (4) B402-B409 (2011).
Lakshminarayanan, N., Kuhn, J.N., Choi, H., Millet, J-M. M., Ozkan, U.S., “Variation of structure and properties of La1-xSrxCo0.2Fe0.8O3-d with Sr content: Implications for Oxidation Activity,” J. Molecular Catalysis, 336, 23–33 (2011).
Lakshminarayanan, N., Choi, H., Kuhn, J.N., Ozkan, U.S., “Effect of additional B-site transition metal doping on oxygen transport and activation characteristics in La0.6Sr0.4(Co0.18Fe0.72X0.1)O3-d (where X= Zn, Ni or Cu) perovskite oxides,” Applied Catalysis B. 103, 318-325 (2011)
Von Deak, D., Biddinger, E.J., Ozkan, U.S., “Corrosion Characteristics of N-containing Carbon Nanostructures in a PEM Fuel Cell Environment” Journal of Applied Electrochemistry, 41, 757-763 (2011).
Bayram, B., Soykal, I.I., von Deak, D., Miller. J.T., Ozkan, U.S., “Ethanol Steam Reforming over Co-based Catalysts: Investigation of Cobalt Coordination Environment under Reaction Conditions,” Journal of Catalysis, 284, 77-89 (2011).
2010
Biddinger, E.J., Knapke, D.S., von Deak, D., Ozkan, U.S., “Effect of Sulfur as a Growth Promoter for CNx Nanostructures as PEM and DMFC ORR Catalysts” Applied Catalysis B, 96, 72-82 (2010).
Song, H. and Ozkan, U.S., “Economic Analysis of Hydrogen Production through a Bio-ethanol Steam Reforming Process: Sensitivity Analyses and Cost Estimations”. International Journal of Hydrogen Energy, 35, 127-134 (2010).
Gawade, P., Mirkelamoglu, B., Tan, B., Ozkan, U.S., “Cr-free Fe-based water-gas shift catalysts prepared through propylene oxide assisted sol-gel technique,” Journal of Molecular Catalysis, 321, 61-70 (2010).
Song, H. and Ozkan, U.S., “The Role of Impregnation Medium on the Activity of Ceria-supported Co Catalysts for Ethanol Steam Reforming,” J. Molecular Catalysis, 318, 21-29 (2010).
Mirkelamoglu, B., Ozkan, U.S., “Effect of Water Vapor on the Activity and Stability of Pd/SZ and Co/ZrO2 in Dual-Catalyst Treatment of Simulated Exhaust from Lean-Burn Natural Gas Engines” Applied Catalysis B, 96, 421-433 (2010).
Song, H. Ozkan, U.S., “Changing the Oxygen Mobility in Co/Ceria Catalysts by Ca Incorporation: Implications for Ethanol Steam Reforming,” Invited paper. Journal of Physical Chemistry A. 114, 3796-3801 (2010).
Woods, M. P. Gawade, P., Tan, B. Ozkan, U.S., “Preferential Oxidation of Carbon Monoxide on Co/CeO2 Nano-particles” Journal of Applied Catalysis B, 97, 28-35 (2010).
Mirkelamoglu, B., Liu, M. and Ozkan, U.S., “ Dual-catalyst Aftertreatment of Lean-Burn Engine Exhaust” Catalysis Today, Invited paper. 151, 386-394 (2010).
Lakshminarayanan, N., Kuhn, J.K., Rykov, S.A., and Ozkan, U.S., “Doped LaFeO3 as SOFC Catalysts : Control of Oxygen Mobility and Oxidation Activity” Catalysis Today. Invited paper, 157, 446-450 (2010).
Woods, M.P., Biddinger, E.J., Matter, P.H., Mirkelamoglu, B. and Ozkan, U.S., “Correlation Between the ORR and ODH Activities of CNx Catalysts”, Catalysis. Letters, 136 (1), 1-8 (2010)
Song, H., Mirkelamoglu, B., and Ozkan, U.S., “Effect of Cobalt Precursor on the Performance of Ceria-Supported Cobalt Catalysts for Ethanol Steam Reforming,” Applied Catalysis A. 382, 58-64 (2010).
Biddinger, E.J., von Deak, D.,Marsh, H., Ozkan, U.S., “RRDE catalyst ink aging effects on selectivity to water formation in ORR,” Electrochemistry and Solid State Letters, 13 (8) B98-B100 (2010).
Song, H., Zhang, L., Ozkan, U.S., “Investigation of Reaction Networks in Ethanol Steam Reforming over Supported Co Catalysts” Industrial and Engineering Chemistry Research, 49, 8984-8989 (2010).
Von Deak, D., Biddinger, E.J., Luthman, K.A., Ozkan, U.S., “The effect of phosphorus in nitrogen-containing carbon nanostructures on oxygen reduction in PEM fuel cells,” Carbon, 48, 3635-3638 (2010).
Biddinger, E.J., Ozkan, U.S., “Role of graphitic edge-plane exposure in carbon nanostructures for oxygen reduction reaction,” J. Phys. Chem. C, 114, 15306–15314 (2010).
Gawade, P., Mirkelamoglu, B., Tan, B., Ozkan, U.S., “Effect of ceria morphology on water gas-shift activity of Cu/CeO2,” J Phys. Chem., 114, 18173-18181 (2010).
Bao, X., von Deak, D. Biddinger, E.J., Ozkan, U.S., Hadad, C.M., “A Computational Exploration of the Oxygen Reduction Reaction over a Carbon Catalyst Containing a Phosphinate Functional Group,” Chemical Communications. 46, 8621-8623 (2010).
2009
Zhang, L. Wang, X., Tan, B., Ozkan, U.S., “Effect of Preparation Method on Structural Characteristics and Propane Steam Reforming Performance of Ni/Al2O3 Catalysts,” J. Mol. Catal. 297, 26-34 (2009).
Song, H., Ozkan, U.S., “Ethanol Steam Reforming over Co-based Catalysts: Role of Oxygen Mobility ” Journal of Catalysis, 261 66-74 (2009).
Zhang, L., Millet, J-M.M., Ozkan, U.S., “Effect of Cu loading on the catalytic performance of Fe-Al-Cu for water-gas shift reaction” Applied Catalysis A, 357, 166-72 (2009)
Woods, M. P., Mirkelamoglu, B., Ozkan, U.S., “Oxygen and Nitrous Oxide as Oxidants: Implications for Ethane Oxidative Dehydrogenation over Silica:Titania Supported Molybdenum”, Journal of Physical Chemistry C, 113, 10112-10119 (2009).
Biddinger, E.J., von Deak, D., Ozkan, U.S., “Nitrogen-containing carbon nanostructures as oxygen-reduction catalysts,” Topics in Catalysis, 52 (11), 1566 (2009).
Zhang, L., Millet, J-M.M., Ozkan, U.S.,” Deactivation characteristics of Fe-Al-Cu water-gas shift catalysts in the presence of H2S” Journal of Molecular Catalysis, 309, 63-70 (2009).
Zhao, Z., Lakshminarayanan, N., Kuhn, J.N., Senefeld-Naber, A., Felix, L.G., Slimane, R., B., Choi, C.W., Ozkan, U.S., “Optimization of thermally impregnated Ni-olivine catalysts for tar removal” Applied Catalysis, 363, 64-72 (2009)
Song, H., Tan, B., Ozkan, U.S., “Novel Synthesis Techniques for Preparation of Co/CeO2 as Ethanol Steam Reforming Catalysts, Catalysis Letters, 132, 422-429 (2009).
2008
Yung, M.M., Zhao, Z., Woods, M.P., Ozkan, U.S., “Preferential Oxidation of Carbon Monoxide on CoOx/ZrO2,“ Journal of Molecular Catalysis. 279, 1-9 (2008).
Kuhn, J.N. and Ozkan, U.S., “Surface properties of Sr-and Co-doped LaFeO3” Journal of Catalysis, 253, 200-211 (2008).
Kuhn, J. N. and Ozkan, U.S., “Effect of Co-content upon the Bulk Structure of Sr- and Co-Doped LaFeO3” Catalysis Letters, 121, 179-188 (2008).
Zhao, Z., Kuhn, J.N., Ozkan, U.S., Felix, L.G., Slimane, R. B., “Thermally Impregrated Ni-olivine Catalysts for Tar Removal by Steam Reforming in Biomass Gasifiers” Industrial and Engineering Chemistry Research. 47, 717-723 (2008)
Kuhn, J.N., Zhao, Z., Felix, L.G., Slimane, R. B., Choi, C.W., Ozkan, U.S., “Olivine catalysts for methane- and tar-steam reforming” Applied Catalysis B. 81, 14-26 (2008).
Kuhn, J.N., Lakshminarayanan, N. and Ozkan, U.S., “ Effect of hydrogen sulfide on the catalytic activity of Ni-YSZ cermets”. Journal of Molecular Catalysis, 282, 9-21 (2008).
Kuhn, J.N. , Zhao, Z., Senefeld-Naber, A., Felix, L.G., Slimane, R.B., Choi, C.W., Ozkan, U.S., “Ni-olivine catalysts prepared by thermal impregnation: structure, steam reforming activity, and stability” Applied Catalysis A 341, 43-49 (2008).
Zhao, Z., Yung, M.M., Ozkan, U.S., “Effect of Support on the Preferential Oxidation of CO over Cobalt Catalysts,” Catalysis Communications, 9, 1465-1471 (2008).
Bunch, A.Y., Wang, X., Ozkan, U.S., “Adsorption Characteristics of Reduced Mo and Ni-Mo Catalysts in the Hydrodeoxygenation of Benzofuran”, App.Catal A., 346, 96-103 (2008).
Kuhn, J.N., Matter, P.H., Millet, J-M.M., Ozkan, U.S., “Oxygen Exchange Kinetics over Sr- and Co-doped LaFeO3” Journal of Physical Chemistry C, 112, 12468-12476 (2008).
Zhang, L. Wang, X., Millet, J-M.M., Matter, P.H., Ozkan, U.S., “Investigation of highly active Fe-Al-Cu catalysts for water-gas shift reaction,” App. Catal. A. 351, 1-8, (2008).
2007
Matter, P.H., Wang, E., Arias, M., Biddinger, E.J., Ozkan, U.S., “Oxygen Reduction Reaction Activity and Surface Properties of Nanostructured Nitrogen-Containing Carbon,” Journal of Molecular Catalysis A, 264, 73-81 (2007).
Matter, P.H., Wang, E., Millet, J-M., Ozkan, U.S., “Characterization of the Iron Phase in CNx-based Oxygen Reduction Reaction Catalysts” Journal of Physical Chemistry C. 111, 1444-1450 (2007).
Yung, M., Holmgreen, E., “Oxidation of NO to NO2 over Supported Co Catalysts “to Journal of Catalysis, 247, 356-367 (2007).
Song, H. Zhang, L. Watson, R.B., Braden, D., Ozkan, U.S., “Investigation of Bio-ethanol Steam Reforming over Cobalt-based Catalysts” Catalysis Today, 129, 346-354 (2007).
Holmgreen, E.M., Yung, M.M., Ozkan, U.S., “Dual catalyst after-treatment of lean-burn natural gas engine exhaust,” Applied Catalysis, B, 74, 73-82 (2007).
Bunch, A.Y., Wang, X, Ozkan, U.S., “Hydrodeoxygenation of Benzofuran over Sulfided and Reduced Ni-Mo/g-Al2O3 Catalysts: Effect of H2S” J. Mol. Catalysis, 270, 264-272 (2007).
Holmgreen, E.M., Yung, M.M., Ozkan, U.S., “Pd-based sulfated zirconia prepared by a single step sol-gel procedure for lean NOx reduction,” Journal of Molecular Catalysis A, 270, 101-111 (2007).
Yung, M.M., Holmgreen, E.M., Ozkan, U.S., “Low-temperature Oxidation of Carbon Monoxide on Co/ZrO2,” Catal Lett., 118, 180-186 (2007).
Biddinger, Elizabeth J.; Ozkan, Umit S., "Methanol Tolerance of CNx Oxygen Reduction Catalysts," Topics in Catalysis, 46, 339-348 (2007).
Song, H., Zhang, L., Ozkan, U.S., “Effect of Synthesis Parameters on the Catalytic Activity of Co/ZrO2 for Bio-ethanol Steam Reforming” Green Chemistry, 9, 686-694 (2007).
2006
Munteanu, R.V., Oktar, N., Holmgreen, E.M., Ozkan, U.S., “The Role of in-situ NH3 Production in NO Reduction with CH4 over Cu-Doped Pd Catalysts,” Journal of Environmental Engineering and Management, 16 (5), 285-295 (2006).
Matter, P.H. and Ozkan, U.S., “Non-metal Catalysts for the Dioxygen Reduction Reaction in An Acidic Electrolyte”. Catalysis Letters, 109, 115-123 (2006).
Matter, P.H., Zhang, L., Ozkan, U.S., “The Role of Nano-structure in Nitrogen-Containing Carbon Catalysts for the Oxygen Reduction Reaction” J. Catal., 239, 83-96 (2006).
Liu, C., Watson, R.B., and Ozkan, U. S. “Spectroscopic characterization of Cl-modified Mo/Si:Ti catalysts for oxidative dehydrogenation of propane”, Topics in catalysis, 41, 63-72 (2006).
Matter, P.H., Millet, J.M., Ozkan, U.S., “Non-metal catalysts for oxygen reduction reaction in PEM fuel cells” Proceedings of the 16th World Hydrogen Energy Conference, 669, Lyon-France, 2006.
Natesakhawat, S., Watson, R.B., Wang, X., Ozkan, U. S. “Development of Chromium-Free Iron-Based Catalysts for High-Temperature Water-Gas Shift Reaction,” Journal of Molecular Catalysis, 260. 82-94 (2006).
Matter, P.H., Wang, E., Arias, M., Biddinger, E.J., Ozkan, U.S., “Oxygen Reduction Reaction Catalysts Prepared from Acetonitrile Pyrolysis Over Alumina Supported Metal Particles”. Journal of Physical Chemistry B, 110, 18374-18384 (2006).
Oktar, N., Mitome, J., Holmgreen, E.M. Ozkan, U.S., “Catalytic Reduction of N2O And NO2 With Methane Over Sol –Gel Palladium Based Catalysts,” Journal of Molecular Catalysis, 259, 171-182 (2006).
Holmgreen, E.M., Yung, M.M., Ozkan, U.S., “Pd catalysts supported on sulfated monoclinic zirconia for the reduction of NO2 with methane under lean conditions,” Catalysis Letters 111, 19-26 (2006).
Matter, P.H., Wang, Ozkan, U.S., “Preparation of Nanostructured Nitrogen-Containing Carbon Catalysts for the Oxygen Reduction Reaction from SiO2 and MgO Supported Metal Particles,” Journal of Catalysis, 243, 395-403 (2006).
2005
Wang, X. and Ozkan, U.S., “Characterization of Active Sites over Reduced Ni-Mo/Al2O3 Catalysts for Hydrogenation of Linear Aldehydes” Journal of Physical Chemistry, 109(5), 1882 (2005).
Wang, X., Saleh, R. Y., and Ozkan, U.S., “ Reaction Network of Aldehyde Hydrogenation over Sulfided Mo-Ni/Al2O3 Catalysts” Journal of Catalysis, 231, 20-31 (2005)
Liu, C. and Ozkan, U.S., “Spectroscopic and Structural Characterization of Chlorine Loading Effects on Mo/Si:Ti Catalysts in Oxidative Dehydrogenation of Ethane,” Journal of Physical Chemistry A, 109(6), 1260-1268 (2005).
Ozkan, U.S., and Watson, R.B., “The structure-function relationships in selective oxidation reactions over metal oxides” Catalysis Today, 100(1-2), 101-114 (2005).
Wang, X. and Ozkan, U.S., “Effect of Pretreatment Conditions on the Performance of Sulfided Ni-Mo/Al2O3 Catalysts for Hydrogenation of Linear Aldehydes” J. Mol. Catal. 232 (1-2), 101-112 (2005).
Wang, X., Saleh, R., and Ozkan, U.S., “Effect of S-compounds and CO on Hydrogenation of Aldehydes over Reduced and Sulfided Ni-Mo/Al2O3 Catalysts” Applied Catalysis, 286, 111-119 (2005).
Natesakhawat, S., Oktar, O., Watson, R.B., Ozkan, U. S. “Effect of Lanthanide Promotion on Catalytic Performance of Sol-Gel Ni/Al2O3 Catalysts in Steam Reforming of Propane”. Journal of Molecular Catalysis A, 241, 133-146 (2005).
Natesakhawat, S., Watson, R.B., Wang, X., Ozkan, U. S. “Deactivation Characteristics of Lanthanide-Promoted Sol-Gel Ni/Al2O3 Catalysts in Propane Steam Reforming” Journal of Catalysis, 234, 496-508 (2005).
Matter, P.H., and Ozkan, U.S., “Effect of Pretreatment Conditions on Cu/Zn/Zr-based Catalysts for Steam Reforming of Methanol to H2”, J. Catal., 234, 463-475 (2005).
2004
Watson, R.B.. Lashbrook, S., and Ozkan, U.S “Chlorine modification of Mo/Silica-Titania Mixed-Oxide Catalysts for the Oxidative Dehydrogenation of Ethane" Journal of Molecular Catalysis,208, 233-244 (2004).
Matter, P.H., Braden, D., Ozkan, U.S., “Steam Reforming of Methanol to H2 over Zr-containing CuO/ZnO Catalysts”, Journal of Catalysis, 223( 2), 340-351 (2004).
Liu, C and Ozkan, U.S., “Effect of Chlorine on Redox and Adsorption Characteristics of Mo/Si:Ti Catalysts in the Oxidative Dehydrogenation of Ethane Journal of Molecular Catalysis A. 220(1), 53-65 (2004).
Wang, X., Li, G-L., Ozkan, U.S., “Hydrogenation of Hexanal over Sulfided Ni-Mo/g-Al2O3 Catalysts” Journal of Molecular Catalysis A, 217, 219-229 (2004).
Wang, X. and Ozkan, U.S., “Correlation of NO and CO2 Adsorption Sites with Aldehyde Hydrogenation Performance of Sulfided Ni-Mo/Al2O3 Catalysts” Journal of Catalysis, 227(2), 492-50, (2004).
Holmgreen, E., Yung, M. and Ozkan, U.S., “Two-Stage Catalytic NOx Reduction with Hydrocarbons for Lean Burn Gas Fired Reciprocating Engines” Proceedings of ICEF04 ASME Internal Combustion Engine Division 2004 Fall Technical Conference 893, 1-7 (2004).
2003
Watson, J.M. and Ozkan, U.S., “Role of NH3 as an Intermediate in Reduction of NO with CH4 Over Sol-Gel Pd-Catalysts on TiO2” Journal of Molecular Catalysis A 192, 79, (2003).
Guliants, V., Ozkan, U.S., Gaffney, A., “Lower Alkane Oxidation,” Catalysis Today, 81(2), 75 (2003).
Watson, J.M. and Ozkan, U.S., ”Spectroscopic Characterization of Surface Species in Deactivation of Sol-Gel Pd Catalysts in NO Reduction with CH4 in the Presence of SO2”, Journal of Catalysis, 217, 1 – 11 (2003).
Watson, R.B.. and Ozkan, U.S., “Propane and Propylene Adsorption Effects over MoOx-based Catalysts Induced by Low Levels of Alkali Doping”. Journal of Molecular Catalysis. A, Chemical, 194, 115 – 135 (2003).
2002
Bunch, A.Y. and Ozkan, U.S., “Investigation of the Reaction Network of Benzofuran Hydrodeoxygenation over Sulfided and Reduced Ni-Mo/Al2O3 Catalysts” Journal of Catalysis, 206 177 (2002).
Karakas, G., Watson, J.M., and Ozkan, U.S., “NO Reduction with CH4 Over Wet-Impregnated and Sol-Gel Pd/TiO2: Characterization by In-Situ DRIFTS’, Catalysis Communications. 3, 199-206 (2002).
Watson, J.M. and Ozkan, U.S., “Adsorption Characteristics of Sol-Gel Gd/Pd/TiO2 Catalysts on Reduction of Nitric Oxide with CH4: DRIFTS and TPD”, J. Catal. , 210, 295, (2002).
Watson, R.B.. and Ozkan, U.S., “Mo Loading Effects Over Mo/Si:Ti Catalysts in the Oxidative Dehydrogenation of Ethane” J. Catal. 208, 124-138 (2002).
Watson, R.B.. and Ozkan, U.S., “Spectroscopic and Structural Characterization of Low-Level Alkali Doping effects on Mo/Silica-Titania Catalysts,” J. Phys. Chem. 106(27), 6930-6941 (2002).
Watson, J.M. and Ozkan, U.S., “Structural and Surface Characteristics of Sol-gel Pd/TiO2 Catalysts for NO Reduction with Methane “Environmental Materials and Technologies , Volume D., Florence, Italy (2002).
2001
Rath, A., Aceves, E., Mitome, J.,. Liu, J., Ozkan, U.S., Shore,S.G., "Application of {(DMF)10Ln2[Pd(CN)4]3} Bimetallic Crystalline Precursors Dispersed on Sol-Gel-TiO2 in the Reduction of NOx with Methane" Journal of Molecular Catalysis A: Chemical, 165, 103-111 (2001).
Watson, R.B. and Ozkan, U.S., “Oxidative Dehydrogenation over Sol-Gel Mo/Si:Ti Catalysts: Effect of Mo Loading”, Stud. Surf. Sci. Catal., 136, 221 (2001).
2000
Bunch, A., Y., Zhang, L., Karakas, G., and Ozkan, U.S. “Reaction Network of Indole Hydrodenitrogenation over NiMoS/-Al2O3 Catalysts,” Applied Catalysis, 190, 51-60 (2000)
Watson, R. B. and Ozkan, U.S., “K-Mo Catalysts Supported over Sol-Gel Silica-Titania Mixed Oxides in the Oxidative Dehydrogenation of Propane," Journal of Catalysis, 191, 12-29 (2000).
Watson, R.B. and Ozkan, U.S., " Oxidative Dehydrogenation of Propane over Alkali- Mo Catalysts Supported on Sol-Gel-Silica-Titania-Mixed-Oxides," Stud. Surf. Sci, Catal., Stud. Surf. Sci. Catal. 130, 1883 (2000).
1999
M. Langpape, J.M.M. Millet, U.S. Ozkan, and M. Boudeulle, “Study of Cesium or Cesium-Transition Metal Substituted Keggin Type Phosphomolybdic Acid As Isobutane Oxidation Catalysts. Part I : Structural Characterization,” J. Catal., 181, 80-90 (1999).
Langpape, J.M.M. Millet, U.S. Ozkan, and P. Delichère, “Study of Cesium or Cesium-Transition Metal Substituted Keggin Type Phosphomolybdic Acid As Isobutane Oxidation Catalysts Part II : Redox and Catalytic Properties,” J. Catal. 182, 148-155 (1999).
Mitome, J., Aceves, E., Ozkan, U.S., "Role of Lanthanide Elements on the Catalytic Behavior of Supported Pd Catalyst in the Reduction of NO with Methane," Catalysis Today, 53, 597-606 (1999).
1998
Ozkan, U.S., Kumthekar, M.W., and Karakas, G., “Characterization and Temperature-programmed Studies over Pd/TiO2 Catalysts for NO Reduction with Methane,” Catalysis Today. 40, 3-14 (1998).
Humayun, R., Karakas, G., Dahlstrom, P.R., Ozkan, U.S., and Tomasko, D.L., “Supercritical Fluid Extraction and Temperature-Programmed Desorption of Phenol and Its Oxidative Coupling Products from Activated Carbon,” Ind. Eng., Chem. Res., 37, 3089-3097 (1998).
Ozkan, U.S. and Spivey, J. “Reduction of NOx and SOx from Stationary Combustion Sources” Catalysis Today, 42(1) 1, (1998).
Mitome, J., Karakas, G., Bryan, K. A. Ozkan, U.S., “Effect of H2O and SO2 on the Activity of Pd/TiO2 Catalysts in Catalytic Reduction of NO with Methane in the Presence of Oxygen,” Catalysis Today, 42, 3-11 (1998).
Zhang, L., Karakas, G., Ozkan, U.S., “NiMoS/g-Al2O3 Catalysts: The Nature and the Aging Behavior of Active Sites in HDN Reactions” Journal of Catalysis. 178, 457-465 (1998).
1997
Ozkan, U.S. Harris, T.A. and Schilf, B.T., “The Partial Oxidation of C5 Hydrocarbons over Vanadia-based Catalysts,” Catalysis Today, 33, 57-71 (1997).
Kumthekar, M.W. and Ozkan, U.S., “Activity and Temperature-Programmed Adsorption/Desorption Behavior of Pd-TiO2 Catalysts in NO/CH4 Reduction and NO Decomposition Reactions,” Catalysis Today, 35, 107-112 (1997).
Kumthekar, M.W. and Ozkan, U.S., “Use of Isotopic Transient Techniques in the Study of NO Reduction Reactions,” Applied Catalysis, A: General, 151(1) 289-303 (1997).
Ozkan, U.S., Kung, H.H., “Catalysis and Photocatalysis on Metal Oxides” Catalysis Today, 33(1), 1 (1997).
Zhang, L. and Ozkan, U.S., “Simultaneous HDN/HDS of Model Compounds over Ni-Mo Sulfide Catalysts,” Studies in Surface Science and Catalysis, 106, 69-82 (1997).
Kumthekar, M.W. and Ozkan, U.S., “Nitric Oxide Reduction with Methane over Pd/TiO2 Catalysts: I. Effect of Oxygen Concentration,” Journal of Catalysis, 171, 45-53 (1997).
Kumthekar, M.W. and Ozkan, U.S., “Nitric Oxide Reduction with Methane over Pd/TiO2 Catalysts: II. Isotopic Labeling Studies Using N-15, O-18, and C-13,” Journal of Catalysis, 171, 54-66 (1997).
Ozkan, U.S., Kumthekar, M.W., and Karakas, G., “Self-Sustained Oscillatory Behavior of NO+CH4+O2 Reaction over Titania-supported Pd Catalysts,” Journal of Catalysis, 171, 67-76 (1997).
Ozkan, U.S., Karakas, G., Schilf, B.T., and Ang, S., “Partial Oxidation of C5 Hydrocarbons to Phthalic and Maleic Anhydrides over Suboxides of Vanadia: Use of Dicyclopentadiene As A Probe Molecule,” Studies in Surface Science and Catalysis, 110, 471-480 (1997).
Ozkan, U.S., Clark, P.A., and Zhang, L., “ Performance and Post-reaction Characterization of-Mo2N Catalysts in Simultaneous Hydrodesulfurization and Hydrodenitrogenation Reactions” J. Catalysis 172, 294-306 (1997).
1996
Zhang, L. and Ozkan, U.S., “Hydrodenitrogenation of Indole over NiMo Sulfide Catalysts,” Studies in Surface Science, 101, 1223-1232 (1996).
Ozkan, U.S., Gooding, R. E., and Schilf, B.T., “Partial Oxidation of C5 Hydrocarbons to Maleic and Phthalic Anhydrides over Molybdate-based Catalysts,” ACS Symposium Series, 638, 179-191 (1996).
1995
Ozkan, U.S., Cai, Y., Kumthekar, M.W., "Mechanistic Studies of Selective Catalytic Reduction of Nitric Oxide with Ammonia over V2O5/TiO2 (Anatase) Catalysts through Transient Isotopic Labeling At Steady-state," Journal of Physical Chemistry. 99(8), 2363-2372 (1995).
1994
Driscoll, S.A. and Ozkan, U.S., "Isotopic Labeling Studies on Oxidative Coupling of Methane over Alkali-Promoted Molybdate Catalysts," Studies in Surface Science and Catalysis, 82, 367-375 (1994).
Ozkan, U.S., Ni, S., Zhang, L., and Moctezuma, E., "Simultaneous Hydrodesulfurization and Hydrodenitrogenation of Model Compounds over Ni-Mo/g-Al2O3 catalysts," Energy & Fuels, 8(1), 249-257 (1994).
Driscoll, S.A., Gardner, D.K., and Ozkan, U.S., "Transient Isotopic Labeling Studies Using 12CH4/13CH4 over Alkali-Promoted Molybdate Catalysts in Oxidative Coupling of Methane," Catalysis Letters 25, 191-199 (1994).
Driscoll, S. A., Gardner, D. K., and Ozkan, U.S., "Characterization, Activity, and Adsorption/Desorption Behavior of Alkali-Promoted Molybdate Catalysts in Oxidative Coupling of Methane ," Journal of Catalysis, 147, 379-392 (1994).
Ozkan, U.S., Zhang, L., Ni, S., and Moctezuma, E., "Investigation of the Role of Nickel and the Effect of Gas Phase Sulfur Compounds on the Performance of Ni-Mo/-Al2O3 Hydrodenitrogenation Catalysts," Journal of Catalysis, 148, 181-193 (1994).
Ozkan, U.S., Cai, Y., and Kumthekar, M.W., "Investigation of the Mechanism of Ammonia Oxidation and Oxygen Exchange in Selective Catalytic Reduction of NO over Vanadia Catalysts Using N-15 and O-18 Tracer Studies," Journal of Catalysis, 149, 375-389 (1994).
Ozkan, U.S., Cai, Y., and Kumthekar, M.W., "Investigation of Reaction Pathways in Selective Catalytic Reduction of NO with NH3 over V2O5 Catalytsts: Isotopic Labeling Studies using 18O2, 15NH3, 15NO, and 15N18O," Journal of Catalysis, 149, 390-403 (1994).
Ozkan, U.S., Zhang. L., Ni, S., and Moctezuma, E., "Characterization and Activity of Unsupported Ni-Mo Sulfide Catalysts in HDN/HDS Reactions," Energy and Fuels, 8, 830-838 (1994).
Ozkan, U.S., Kumthekar, M.K., and Cai, Y., "Selective Catalytic Reduction of Nitric Oxide over Vanadia/Titania Catalysts: Temperature-Programmed Desorption and Isotopically Labeled Oxygen Exchange Studies," I&EC Research, 33, 2924-2929 (1994).
1993
Rajesh, H. and Ozkan, U.S., "Catalytic Oxidation of Ethanol, Acetaldehyde and Ethanol/Methanol Mixtures over Cu Oxide and Cu-Cr Oxide Catalysts," Industrial and Engineering Chemistry Research, 32(8), (1993).
Driscoll, S.A. and Ozkan, U.S., "Oxidative Coupling of Methane over Alkali-Promoted Simple Molybdate Catalysts," in Catalytic Selective Oxidation, (Eds, S.T. Oyama, J.W. Hightower) ACS Book Series, 523, 340-353 (1993).
Ozkan, U.S., Cai, Y., Kumthekar, M.W., and Zhang, L., "Characterization and Activity of Vanadium Oxide Catalysts in Selective Catalytic Reduction of Nitric Oxide," in New Frontiers in Catalysis , Guczi. L., Solymosi, F., and Tetenyi, P., (Akademiai Kiado, Budapest, Hungary, 1993), p.1543-1547.
Ozkan, U.S., Cai, Y, and Kumthekar, M.W., "Effect of Crystal Morphology in Selective Catalytic Reduction of NO over V2O5 Catalysts," Applied Catalysis, 96, 365-381 (1993).
Smith, M.R. and Ozkan, U.S., "The Partial Oxidation of Methane to Formaldehyde: Role of Different Crystal Planes of MoO3," Journal of Catalysis, 141, 124-139 (1993).
Ozkan, U.S. Cai, Y., Kumthekar, M.W., and Zhang, L., "Role of Ammonia Oxidation in Selective Catalytic Reduction of Nitric Oxide over Vanadia Catalysts," Journal of Catalysis, 142, 182-197, (1993).
Smith, M.R. and Ozkan, U.S., "Transient Isotopic Labeling Studies under Steady-state Conditions in Partial Oxidation of Methane to Formaldehyde over MoO3 Catalysts," Journal of Catalysis, 142, 226-236, (1993).
Smith, M.R., Zhang, L., Ozkan, U.S., "Effect of Surface Species on Activity and Selectivity of MoO3/SiO2 Catalysts in Partial Oxidation of Methane to Formaldehyde," Catalysis Letters, 19, 1-15 (1993).
Driscoll, S.A. and Ozkan, U.S., "Transient Isotopic Labeling Using16O2/18O2 over Alkali-Promoted Molybdate Catalysts in Oxidative Coupling of Methane," Journal of Physical Chemistry, 97 (44), 11524-11529 (1993).
1992
Ozkan, U.S., Smith, M.R., Driscoll, R.A., "Synergy Effects in Selective Oxidation Catalysis," Studies in Surface Science and Catalysis, 72, 363-377 (1992).
Ozkan, U.S., Smith, M.R., and Driscoll, S.A., "Investigation of Synergy Effects in Selective Oxidation Catalysts through In-situ Laser Raman Spectroscopy/Isotopic Labeling Technique," Journal of Catalysis, 134, 24-35 (1992).
Ozkan, U.S., Cai, Y., and Kumthekar, M. W., "Selective Catalytic Reduction of Nitric Oxide with Ammonia," in Catalytic Control of Air Pollution: Mobile and Stationary Sources, (eds. R.G. Silver, J.E. Sawyer, J.C. Summers) ACS Book Series, 495 Chap. 9 (1992).
1991
Cai, Y. and Ozkan, U.S., "NOx Emission Control by Selective Catalytic Reduction Technique," in Environment and Energy, Vol. F, Veziroglu, T.N. ed., (Nova Science Publishers, New York, NY, 1991) p. 127-152.
Cai, Y. and Ozkan, U.S., "Selective Catalytic Reduction of NOx with Ammonia," International Journal of Energy, Environment and Economics, 1(3), 229-236 (1991).
Cai, Y. and Ozkan, U.S., "Vanadia/Titania Catalysts in Selective Catalytic Reduction of NO," Applied Catalysis, 78(2), 241-255 (1991).
1990
Ozkan, U.S., Moctezuma, E. and Driscoll, S.A., "Transient Response Studies of C4 Hydrocarbon Oxidation over MnMoO4/MoO3 Catalysts," Applied Catalysis, 58, 305-318 (1990).
Gill, R.C. and Ozkan, U.S., "MoO3 Catalysts Promoted by MnMoO4: II. Effect of O2 Concentration and Temperature in Selective Oxidation of 1-Butene to Maleic Anhydride," Journal of Catalysis, 122, 452-456 (1990).
Ozkan, U.S., Smith, M.R., and Driscoll, S.A., "Effect of O2 Concentration in Selective and Complete Oxidation of 1,3-Butadiene, Furan, and Maleic Anhydride over MnMoO4/MoO3 Catalysts," Journal of Catalysis, 123, 173-180 (1990).
Ozkan, U.S., Driscoll, S.A., Zhang, L. And Ault, K.L., "Investigation of Oxygen Insertion Mechanism in Selective Oxidation Reactions over MnMoO4/MoO3 Catalysts Through Isotopic Labeling and Chemisorption Studies," Journal of Catalysis, 124, 183-193 (1990).
Ozkan, U.S., Kueller, R.F., and Moctezuma, E., "Methanol Oxidation over Non-precious Transition Metal Oxide Catalysts," Industrial and Engineering Chemistry Research, 29(7), 1136-1142 (1990).
Hernandez, R.A. and Ozkan, U.S., "Structural Specificity of Molybdenum Trioxide in C4 Hydrocarbon Oxidation," Industrial and Engineering Chemistry Research, 29(7) 1454-1459 (1990).
Ozkan, U.S., Gill, R.C., and Smith, M.R., "Synergy in CdMoO4/MoO3 Catalysts in Partial Oxidation Reactions of C4 Hydrocarbons," Applied Catalysis, 62, 105-117 (1990).
Pre-1990
Ozkan, U.S., Gill, R.C., and Smith M.R., "MoO3 Catalysts Promoted by MnMoO4: I. Synthesis, Characterization and Selectivity in Oxidation of 1-Butene and 1,3-Butadiene to Maleic Anhydride," Journal of Catalysis, 116, 171-183 (1989).
Schrader, G.L. and Ozkan, U., "Laser Raman Microprobe Analysis of Selective Oxidation Catalysts," in Microbeam Analysis, Geiss, R.H. ed., (San Francisco Press, San Francisco, CA, 1987), p.128-130.
Ozkan, U.S. and Schrader, G.L., "Synthesis, Characterization and Catalytic Behavior of Cobalt Molybdates in 1-Butene Oxidation to Maleic Anhydride," Applied Catalysis, 23, 327-328 (1986).
Ozkan, U.S. and Schrader, G.L., "NiMoO4 Selective Oxidation Catalysts Containing Excess MoO3 for the Conversion of C4 Hydrocarbons to Maleic Anhydride: I. Preparation and Characterization," Journal of Catalysis, 95, 120-136 (1985).
Ozkan, U.S. and Schrader, G.L., "NiMoO4 Selective Oxidation Catalysts Containing Excess MoO3 for the Conversion of C4 Hydrocarbons to Maleic Anhydride: II. Selective Oxidation of 1-Butene," Journal of Catalysis, 95, 137-146 (1985).
Ozkan, U.S. and Schrader, G.L., "NiMoO4 Selective Oxidation Catalysts Containing Excess MoO3 for the Conversion of C4 Hydrocarbons to Maleic Anhydride: III. Selective Oxidation of 1,3-Butadiene and Furan," Journal of Catalysis, 95, 147-154 (1985).
Ozkan, U.S., "Producing Maleic Anhydride Using C4 Hydrocarbons," in Industrial Innovative Concepts, Watts, R.L., Lee, V.E., Levine, L.O. and Smith, S.A., eds., (Arlington, Virginia, 1985), p. 1-12.
Selcuk, N. and Ozkan, U.S., "Testing of A Model for Fluidized Coal Combustors," in Proceedings of the Twentieth Symposium (International) on Combustion (The Combustion Institute, Pittsburgh, PA, 1984), p.1471-1478.
Sivrioglu (Ozkan), U., Batista, M.S., Schrader,G.L., "Preparation of Bismuth and Nickel Molybdate Catalysts: Incorporation of Excess Molybdenum Oxide, " in Chemistry and Uses of Molybdenum - IV, Barry, J.F., Mitchell, P.C.H. eds. (Climax, Ann Arbor, MI, 1982), p. 415-427.
Selcuk, N. and Sivrioglu (Ozkan), U., "Mathematical Modeling of Fluidized Coal Combustors," Journal of Thermal Sciences and Technology, 3(1), 31-38 (1980).