The action of VOx doping on Au/CeO2 catalysts for CO oxidation and water–gas shift reaction
作者： Weiping Liao , Hongying Lv , Zhanghuai Suo
DOI: 10.1007/S11144-015-0921-5
关键词:
摘要: VOx–CeO2 oxides with different Ce/V molar ratios were prepared via solution combustion synthesis method. Au/VOx–CeO2 catalysts obtained by the impregnation method for CO oxidation and water–gas shift reaction (WGSR). The textural properties structures of these materials investigated techniques such as nitrogen physical adsorption, X-ray diffraction, UV–Visible spectroscopy, temperature-programmed reduction, photoelectron spectroscopy. following activity orders are obtained: Au/CeO2 ~ Au/Ce9V1 > Au/Ce7V3 > Au/Ce5V5 at 20 °C Au/Ce9V1 > Au/CeO2 > Au/Ce7V3 > Au/Ce5V5 WGSR 350 °C. proceeds more easily than same catalyst. low VOx content show better activities. addition high content to CeO2 leads to agglomeration polymeric or polyvanadate species. These species make reduction difficult interaction between gold weak. presence Au effectively enhances lower temperatures. gold, VOx, is favorable improving
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