Low temperature gas-phase oxidation of ethanol over Au/TiO₂

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• 作者：Vladimir I. Sobolev ; Konstantin Yu. Koltunov ; Olga A. Simakova ; Anne-Riikka Leino ; Dmitry Yu. Murzin
• 关键词：Ethanol ; Selective oxidation ; Gold ; Nanoparticles ; Au/TiO2
• 刊名：Applied Catalysis A: General
• 出版年：2012
• 出版时间：8 August, 2012
• 年：2012
• 卷：433-434
• 期：Complete
• 页码：88-95
• 全文大小：793 K

文摘

A set of nanostructured gold catalysts with Au loadings ranging from 0.5 to 7.0 wt % on a TiO₂ support was prepared and evaluated in a gas-phase oxidation of ethanol with molecular oxygen. The catalytic activity was measured in a flow reactor under atmospheric pressure using temperature programmed heating. The catalysts with Au loadings varying from 2 wt % to 7 wt % displayed two distinct temperature dependent peaks of catalytic activity in ethanol oxidation to acetaldehyde. The temperature, at which the first peak occurred, 125 ¡ãC, is extraordinarily low for the gas-phase oxidation of ethanol. In contrast, gold supported on Al₂O₃ and SiO₂, which was prepared and tested in the same reaction for the purpose of comparison, showed conventional, steady increase of ethanol conversion at temperatures above 200 ¡ãC. The results demonstrated a possibility to employ Au/TiO₂ catalysts in selective low temperature gas phase oxidation of ethanol. The probable reasons of the unusual catalytic behavior of Au/TiO₂ are discussed.