Dehydrogenation of acetylene and ethylene studied on clean and oxygen covered palladium surfaces |
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| Affiliation: | 1. Department of Chemical Engineering, Tafresh University, P.O. Box 79611-39518, Tafresh, Iran;2. Faculty of Chemical Engineering, Babol Noshirvani University of Technology, P.O. Box 484, Babol, Iran;1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;2. Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;3. Department of Chemistry, School of Science, Nanchang University, Nanchang 330031, China;4. Department of Chemistry, Fuzhou University, Fuzhou 350108, China;1. Forschungszentrum Jülich, IEK-3: Electrochemical Process Engineering, 52425, Jülich, Germany;2. Gas- und Wärme-Institut Essen e.V. (GWI), Germany;3. Institute of Energy Economics at the University of Cologne (EWI), Germany;4. Forschungszentrum Jülich, IEK-STE: Systems Analysis and Technology Evaluation, 52425, Jülich, Germany;5. Wuppertal Institut for Climate, Environment and Energy, Germany;6. RWTH Aachen University, Chair for Fuel Cells, Faculty of Mechanical Engineering, 52072, Aachen, Germany;1. G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russian Federation;2. Fritz Haber Institute of the Max Planck Society, 14195 Berlin, Germany;3. Helmholtz Center for Materials and Energy, 12489 Berlin, Germany;4. Max Planck Institute for Chemical Energy Conversion, Department of Heterogeneous Reactions, 45470 Mülheim an der Ruhr, Germany;5. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation |
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| Abstract: | The interaction of acetylene and ethylene with a clean and oxygen covered Pd surface has been studied at a temperature of 473 K. The measurements were performed on a hydrogen sensitive Pd-MOS structure making it possible to obtain direct information on the dissociation of both hydrogen and oxygen containing species on a palladium surface. Desorption studies were also performed as well as ultraviolet photoelectron spectroscopy and work function measurements. The studies show that both acetylene and ethylene adsorb dissociatively at this temperature leaving mainly carbon on the surface. When an oxygen covered Pd surface is exposed to C2H2 or C2H4 carbon dioxide and water will be formed and desorb until the surface is oxygen free. In the case of acetylene the presence of preadsorbed oxygen does not block or prevent the C2H2 dissociation on the surface. For C2H4, a large preadsorbed oxygen coverage (⪆ 0.45) will have an impeding effect on the dissociation. The CO2 desorption is oxygen coverage dependent contrary to the H2O desorption. This is due to the fact that hydrogen has a large lateral mobility on the surface while carbon has not. Both the CO2 and H2O reactions are, however, due to the same type of mechanisms. |
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