| Valence State of Active Copper in CuOx/CeO2 Catalysts for CO Oxidation |
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| 作者姓名： | 曾尚红 白雪 王晓燕 于文国 刘源 |
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| 作者单位： | [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 |
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| 摘 要： | 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 Cu^0, 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.
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| 关 键 词： | 活性中心 一氧化碳 二氧化铈 铜 优先氧化 催化剂 |
| 文章编号： | 1002-0721（2006）02-0177-05 |
| 收稿时间： | 2005-07-21 |
| 修稿时间： | 2005-10-10 |
Valence State of Active Copper in CuOx/CeO2 Catalysts for CO Oxidation |
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| Shanghong , Xue Bai, Xiaoyan Wang, Wenguo Yu,Yuan Liu,.Valence State of Active Copper in CuOx/CeO2 Catalysts for CO Oxidation[J].Journal of Rare Earths,2006,24(2):177-181. |
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| Authors: | Shanghong Xue Bai Xiaoyan Wang Wenguo Yu Yuan Liu |
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| Affiliation: | aDepartment of Catalysis Sciences and Technology, College of Chemical Engineering, Tianjin University, Tianjin 300072, China;bSchool of Chemical Engineering, Inner Mongolia University of Technology, Huhhot 010062, China |
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| 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 Cu2 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 Cu2 .Only when Cu2 is reduced to Cu or Cu0, the copper may be active for CO oxidation, moreover, the experimental results show that the reduction of Cu2 does not lead to an increase of catalytic activity.So the active species is Cu in CuOx/CeO2 catalysts. |
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| Keywords: | active center carbon monoxide ceria copper preferential oxidation hydrogen production rare earths |
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