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题名: CO adsorption and correlation between CO surface coverage and activity/selectivity of preferential CO oxidation over supported Ag catalyst: an in situ FTIR study
作者: Qu, ZP;  Zhou, ST;  Wu, WC;  Li, C;  Bao, XH
通讯作者: 包信和
关键词: FTIR ;  preferential CO oxidation ;  silver catalyst ;  CO coverage ;  selectivity
刊名: CATALYSIS LETTERS
发表日期: 2005-05-01
DOI: 10.1007/s10562-004-3742-0
卷: 101, 期:1-2, 页:21-26
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 502,503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: In situ IR measurements for CO adsorption and preferential CO oxidation in H-2-rich gases over Ag/SiO2 catalysts are presented in this paper. CO adsorbed on the Ag/SiO2 pretreated with oxygen shows a band centered around 2169 cm(-1), which is assigned to CO linearly bonded to Ag+ sites. The amount of adsorbed CO on the silver particles ( manifested by an IR band at 2169 cm(-1)) depends strongly on the CO partial pressure and the temperature. The steady-state coverage on the Ag surface is shown to be significantly below saturation, and the oxidation of CO with surface oxygen species is probably via a non-competitive Langmuir Hinshelwood mechanism on the silver catalyst which occurs in the high-rate branch on a surface covered with CO below saturation. A low reactant concentration on the Ag surface indicates that the reaction order with respect to Pco is positive, and the selectivity towards CO2 decreases with the decrease of Pco. On the other hand, the decrease of the selectivity with the reaction temperature also reflects the higher apparent activation energy for H-2 oxidation than that for CO oxidation.
关键词[WOS]: CARBON-MONOXIDE OXIDATION ;  LOW-TEMPERATURE ;  COMPOSITE OXIDES ;  SILVER CATALYST ;  H-2-RICH GAS ;  KINETICS ;  SPECTROSCOPY ;  OXYGEN
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000228549400004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/93105
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
2.Univ Stuttgart, Inst Phys Chem, D-70569 Stuttgart, Germany

Recommended Citation:
Qu, ZP,Zhou, ST,Wu, WC,et al. CO adsorption and correlation between CO surface coverage and activity/selectivity of preferential CO oxidation over supported Ag catalyst: an in situ FTIR study[J]. CATALYSIS LETTERS,2005,101(1-2):21-26.
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