Galvanic deposition of silver on 80‐μm‐Cu‐fiber for gas‐phase oxidation of alcohols |
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| Authors: | Guofeng Zhao Yakun Li Qiaofei Zhang Miaomiao Deng Fahai Cao Yong Lu |
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| Affiliation: | 1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Dept. of Chemistry, East China Normal University, Shanghai, P.R. China;2. College of Chemical Engineering, East China University of Science and Technology, Shanghai, P.R. China;3. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University, Shanghai, P.R. China |
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| Abstract: | Microstructured Ag‐based catalysts were developed by galvanically depositing Ag onto 80‐μm‐Cu‐fibers for the gas‐phase oxidation of alcohols. By taking advantages including large voidage, open porous structure and high heat/mass transfer, as‐made catalysts provided a nice combination of high activity/selectivity and enhanced heat transfer. The best catalyst was Ag‐10/80‐Cu‐fiber‐400 (Ag‐loading: 10 wt%; Cu‐fiber pretreated at 400 °C in air), being effective for oxidizing acyclic, benzylic and polynary alcohols. For benzyl alcohol, conversion of 94% was achieved with 99% selectivity to benzaldehyde at 300 °C using a high WHSV of 20 h?1. Computational fluid dynamics (CFD) calculation and experimental result illustrated significant enhancement of the heat transfer. The temperature difference from reactor wall to central line was about 10–20 °C for the Ag‐10/80‐Cu‐fiber‐400, much lower than that of 100–110 °C for the Ag‐10‐Cu‐2/Al2O3 at equivalent conversion and selectivity. Synergistic interaction between Cu2O and Ag was discussed, being assignable to the activity improvement. © 2014 American Institute of Chemical Engineers AIChE J, 60: 1045–1053, 2014 |
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| Keywords: | Cu‐fiber silver catalyst alcohol oxidation galvanic deposition heat transfer computational fluid dynamics |
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