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Galvanic deposition of silver on 80‐μm‐Cu‐fiber for gas‐phase oxidation of alcohols
Author(s) -
Zhao Guofeng,
Li Yakun,
Zhang Qiaofei,
Deng Miaomiao,
Cao Fahai,
Lu Yong
Publication year - 2014
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.14295
Subject(s) - selectivity , oxidizing agent , catalysis , chemistry , benzyl alcohol , benzaldehyde , galvanic cell , fiber , deposition (geology) , alcohol , mass transfer , chemical engineering , heat transfer , inorganic chemistry , organic chemistry , chromatography , thermodynamics , paleontology , physics , sediment , engineering , biology
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/Al 2 O 3 at equivalent conversion and selectivity. Synergistic interaction between Cu 2 O and Ag was discussed, being assignable to the activity improvement. © 2014 American Institute of Chemical Engineers AIChE J , 60: 1045–1053, 2014