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Received June 1, 2009
Accepted August 4, 2009
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Effect of preparation method on structure and catalytic activity of Cr-promoted Cu catalyst in glycerol hydrogenolysis
World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2),School of Chemical and Biological Engineering, College of Engineering, Seoul National University (SNU), Seoul 151-742, Korea 1GS Caltex Corporation, 104-4 Munji-dong, Yusung-gu, Daejeon 305-380, Korea
Korean Journal of Chemical Engineering, February 2010, 27(2), 431-434(4), 10.1007/s11814-010-0070-5
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Abstract
Relationships between surface structure and catalytic properties were investigated for a series of copper chromium catalysts. The catalysts were prepared using methods involving impregnation and precipitation, and their catalytic activities were evaluated for the hydrogenolysis of glycerol. Catalyst (10I and 50I) prepared by the impregnation method contained a mixed phase of both individual copper and chromium oxide structures, while the catalyst (50P) prepared by precipitation showed a single phase, with a copper chromite spinel structure (CuCr2O4). XPS data indicated that, after the reduction step, the copper species in the impregnated catalyst was reduced to Cu^(0), but the catalyst prepared by the precipitation method retained a spinel structure evidenced by the large amount of Cu^(2+) species. In hydrogenolysis reactions, the precipitated catalyst showed a higher catalytic activity than the impregnated catalyst. Thus, the reduced copper chromite spinel structure, which constitutes a single phase, appears to be responsible for the high catalytic activity in the hydrogenolysis of glycerol to propylene glycol.
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