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题名: CuO/CeO2 catalysts: Redox features and catalytic behaviors
作者: Tang, XL;  Zhang, BC;  Li, Y;  Xu, YD;  Xin, Q;  Shen, WJ
关键词: CuO/CeO2 ;  redox features ;  chemical states ;  metal-support interaction ;  CO oxidation
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 2005-07-15
DOI: 10.1016/j.apcata.2005.04.024
卷: 288, 期:1-2, 页:116-125
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: The reduction and oxidation features of nanostructured CuO/CeO2 catalysts prepared by the deposition-precipitation method were extensively investigated by TPR, FIF-IR and in situ XPS techniques. Both the chemical states of copper and the reduction degree of ceria could be well controlled during the reduction with hydrogen by adjusting the temperature. Noticeably, the fully reduced Cu-0 could be further oxidized into Cu+ in hydrogen by increasing the reduction temperature through the interaction between Cu-0 and lattice oxygen of ceria immigrating to the surface. Structure-reactivity relationship was established between the structural features of CuO/CeO2 formed during the pre-reduction with hydrogen and its catalytic activities for CO oxidation. It was observed that reduction with hydrogen at 473-573 K, which leads to the full presence of metallic copper in the catalyst, gives rise to higher CO conversion. These phenomena were interpreted in terms of the reduction degrees of ceria, the changes of surface morphology and the chemical states of copper species. The interface oxygen activation as well as its transfer from the interface to the adsorbed reactant was found to play decisive roles in determining the reaction rate of CO oxidation. (c) 2005 Elsevier B.V. All rights reserved.
关键词[WOS]: CARBON-MONOXIDE OXIDATION ;  OXIDE COMPOSITE CATALYSTS ;  CO OXIDATION ;  CU/CEO2 CATALYST ;  COPPER CATALYST ;  CERIA ;  METAL ;  CU ;  REDUCTION ;  SPECTROSCOPY
语种: 英语
WOS记录号: WOS:000230685200016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139857
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Tang, XL,Zhang, BC,Li, Y,et al. CuO/CeO2 catalysts: Redox features and catalytic behaviors[J]. APPLIED CATALYSIS A-GENERAL,2005,288(1-2):116-125.
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