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Valence State of Active Copper in CuOx/CeO2 Catalysts for CO Oxidation

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【作者】 曾尚红； 白雪； 王晓燕； 于文国； 刘源；

【Author】 Zeng Shanghong1, Bai Xue 2, Wang Xiaoyan 2, Yu Wenguo 2, Liu Yuan1 (1. Department of Catalysis Sciences and Technology, College of Chemical Engineering, Tianjin University, Tianjin 300072, China; 2. School of Chemical Engineering, Inner Mongolia University of Technology, Huhhot 010062, China)

【机构】 Department of Catalysis Sciences and Technology College of Chemical Engineering Tianjin University Tianjin 300072 China； School of Chemical Engineering Inner Mongolia University of Technology Huhhot 010062 China； Department of Catalysis Sciences and Technology College of Chemical Engineering Tianjin University Tianjin 300072 China；

【Abstract】 CuOx/CeO2 catalysts were prepared by adsorption-impregnation method. CO conversion was tested over the catalysts pretreated under different conditions for preferential CO oxidation in H2, and the catalysts were characterized with X-ray photoelectron spectroscopy and temperature programmed reduction. Experimental results show that there are two kinds of copper, which are Cu+ and Cu 2+ in calcined CuOx/CeO2. Among them, the Cu+ is the key active component for CO oxidation. The main reason is as follows: CO is activated by copper for CO oxidation over CuOx/CeO2, while CO can not be activated by Cu 2+ . Only when Cu 2+ is reduced to Cu+ or Cu0, the copper may be active for CO oxidation, moreover, the experimental results show that the reduction of Cu 2+ does not lead to an increase of catalytic activity. So the active species is Cu+ in CuOx/CeO2 catalysts.

【关键词】 active center； carbon monoxide； ceria； copper； preferential oxidation； hydrogen production； rare earths；
【Key words】 active center； carbon monoxide； ceria； copper； preferential oxidation； hydrogen production； rare earths；
【基金】 ProjectsupportedbytheNationalNaturalScienceFoundationofChina(20476079,20263002)
  • 【文献出处】 Journal of Rare Earths ,稀土学报(英文版) , 编辑部邮箱 ,2006年02期
  • 【分类号】O643.32
  • 【被引频次】5
  • 【下载频次】63
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