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CO adsorption and correlation between CO surface coverage and activity/selectivity of preferential CO oxidation over supported Ag catalyst: an in situ FTIR study
Qu, ZP; Zhou, ST; Wu, WC; Li, C; Bao, XH; Bao XH(包信和); Bao XH(包信和)
关键词Ftir Preferential Co Oxidation Silver Catalyst Co Coverage Selectivity
刊名CATALYSIS LETTERS
2005-05-01
DOI10.1007/s10562-004-3742-0
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
关键词[WOS]CARBON-MONOXIDE OXIDATION ; LOW-TEMPERATURE ; COMPOSITE OXIDES ; SILVER CATALYST ; H-2-RICH GAS ; KINETICS ; SPECTROSCOPY ; OXYGEN
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.
语种英语
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WOS记录号WOS:000228549400004
引用统计
被引频次:23[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/321008/93105
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
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GB/T 7714
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.
APA Qu, ZP.,Zhou, ST.,Wu, WC.,Li, C.,Bao, XH.,...&包信和.(2005).CO adsorption and correlation between CO surface coverage and activity/selectivity of preferential CO oxidation over supported Ag catalyst: an in situ FTIR study.CATALYSIS LETTERS,101(1-2),21-26.
MLA Qu, ZP,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".CATALYSIS LETTERS 101.1-2(2005):21-26.
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