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题名: Formation of subsurface oxygen species and its high activity toward CO oxidation over silver catalysts
作者: Qu, ZP;  Cheng, MJ;  Huang, WX;  Bao, XH
通讯作者: 包信和
关键词: silver ;  CO-selective oxidation ;  subsurface oxygen ;  migration
刊名: JOURNAL OF CATALYSIS
发表日期: 2005-01-25
DOI: 10.1016/j.jcat.2004.11.043
卷: 229, 期:2, 页:446-458
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 502
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Silver is well known to show peculiar catalytic activities in several oxidation reactions. In the present paper, we investigate the catalytic activity of silver catalysts toward CO-gelective oxidation in H-2. XRD, TEM, TPD, and in situ FTIR techniques were used to characterize the catalysts. The pretreatment of the catalysts was found to have great influence on their performance. The pretreatment in 02 improves the activity of the silver catalyst, whereas He pretreatment at 700 degreesC or direct hydrogen pretreatment shows an inverse effect. Silver catalysts undergo massive structural change during oxygen pretreatment at high temperatures (> 500 degreesC), and there is solid evidence for the formation of subsurface oxygen species. The existence of this silver-subsurface oxygen structure facilitates the formation of active sites on silver catalysts for CO oxidation, which are related to the size, morphology, and exposed crystal planes of the silver particles. Its formation requires a certain temperature, and a higher pretreatment temperature with oxygen is required for the silver catalyst with a smaller particle size. It is observed, for the first time, that adsorbed CO on the surface of silver particles can directly react with subsurface oxygen species at low temperatures (e.g., RT), and the surface oxygen can migrate into and refill these subsurface sites after the consumption of subsurface oxygen by the reaction with CO. This finding provides a new reaction pathway for CO oxidation on silver catalyst. (C) 2004 Published by Elsevier Inc.
关键词[WOS]: CARBON-MONOXIDE OXIDATION ;  FUEL-CELL APPLICATIONS ;  SELECTIVE OXIDATION ;  H-2-RICH GAS ;  ETHYLENE EPOXIDATION ;  ELECTROLYTIC SILVER ;  TEMPERATURE ;  SURFACE ;  AG(111) ;  CHEMISORPTION
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000227146700018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/93115
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:
Qu, ZP,Cheng, MJ,Huang, WX,et al. Formation of subsurface oxygen species and its high activity toward CO oxidation over silver catalysts[J]. JOURNAL OF CATALYSIS,2005,229(2):446-458.
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