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Formation of subsurface oxygen species and its high activity toward CO oxidation over silver catalysts
Qu, ZP; Cheng, MJ; Huang, WX; Bao, XH; Bao XH(包信和); Bao XH(包信和)
关键词Silver Co-selective Oxidation Subsurface Oxygen Migration
刊名JOURNAL OF CATALYSIS
2005-01-25
DOI10.1016/j.jcat.2004.11.043
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
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
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.
语种英语
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WOS记录号WOS:000227146700018
引用统计
被引频次:130[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/93115
专题中国科学院大连化学物理研究所
通讯作者Bao XH(包信和); Bao XH(包信和)
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
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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.
APA Qu, ZP,Cheng, MJ,Huang, WX,Bao, XH,包信和,&包信和.(2005).Formation of subsurface oxygen species and its high activity toward CO oxidation over silver catalysts.JOURNAL OF CATALYSIS,229(2),446-458.
MLA Qu, ZP,et al."Formation of subsurface oxygen species and its high activity toward CO oxidation over silver catalysts".JOURNAL OF CATALYSIS 229.2(2005):446-458.
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