Origin of the cluster-size effect in the hydrogenation of cinnamaldehyde over supported Au catalysts |
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| Affiliation: | 1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;1. Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;2. Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakorn Pathom 73000, Thailand;3. Division of Chemical Process Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan;1. Department of Chemistry, School of Science, Institute of Molecular Plus, Tianjin University, Tianjin, Nankai District 300072, China;2. Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, Tianjin, Nankai District 300072, China;1. Department of Chemistry, Northeastern University, Shenyang 110819, People’s Republic of China;2. MOE Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology, Beijing Key Lab of Microanalytical Methods & Instrumentation, Department of Chemistry, Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, People’s Republic of China;1. N.D. Zelinsky Institute of Organic Chemistry RAS, Moscow, Russia;2. Process Chemistry Centre, Åbo Akademi University, Turku, Finland;3. Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia |
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| Abstract: | Gold nanoclusters supported on γ-Al2O3 were more active and selective than platinum nanoclusters in the high-pressure liquid-phase hydrogenation of cinnamaldehyde to cinnamylalcohol, while in the hydrogenation of cyclohexene gold was less active than platinum. The differences in catalytic performance are ascribed to the weaker interaction of gold with the reactants and products compared to platinum. Gold clusters with a diameter below 2 nm are essential to obtain a high activity and selectivity in the hydrogenation of cinnamaldehyde. The size dependence of the selectivity originates from the stronger dependence of the C O hydrogenation rate on cluster size compared to the CC hydrogenation rate. Small clusters exhibit an enhanced π backbonding, which favors CO adsorption over CC adsorption. |
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