Boosting Size‐Selective Hydrogen Combustion in the Presence of Propene Using Controllable Metal Clusters Encapsulated in Zeolite |
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| Authors: | Dr Yuling Shan Prof Dr Zhijun Sui Prof Dr Yian Zhu Prof Dr Jinghong Zhou Prof Dr Xinggui Zhou Prof Dr De Chen |
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| Institution: | 1. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, China;2. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, China;3. Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim, Norway |
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| Abstract: | A strategy is presented for making metal clusters encapsulated inside microporous solids selectively accessible to reactant molecules by manipulating molecular sieve size and affinity for adsorbed molecules. This expands the catalytic capabilities of these materials to reactions demanding high selectivity and stability. Selective hydrogen combustion was achieved over Pt clusters encapsulated in LTA zeolite (KA, NaA, CaA) in a propene‐rich mixture obtained from propane dehydrogenation, showing pore‐size dependent selectivity and coking rate. Propene tended to adsorb at channels or external surfaces of zeolite, interfering the diffusion of hydrogen and oxygen. Tailoring the surface of LTA zeolite with additional alkali or alkaline earth oxides contributed to narrowing zeolite pore size and their affinity for propene. The thus‐modified Pt@KA catalyst displayed excellent hydrogen combustion selectivity (98.5 %) with high activity and superior anti‐coking and anti‐sintering properties. |
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| Keywords: | encapsulation heterogeneous catalysis propane dehydrogenation selective hydrogen combustion zeolites |
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