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题名: CO selective oxidation in H-2-rich gas over Ag nanoparticles - effect of oxygen treatment temperature on the activity of silver particles mechanically mixed with SiO2
作者: Qu, ZP;  Cheng, MJ;  Dong, XL;  Bao, XH
关键词: CO selective oxidation ;  silver powder ;  SiO2 ;  mechanical mixing ;  oxygen treatment
刊名: CATALYSIS TODAY
发表日期: 2004-09-01
DOI: 10.1016/j.cattod.2004.06.133
卷: 93-5, 页:247-255
收录类别: ISTP ;  SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: In order to elucidate the roles of pretreatment with oxygen at high temperatures and the interaction between Ag nanoparticles and SiO2 in low-temperature CO selective oxidation, a mechanical mixture of Ag nanoparticles and SiO2 powder was prepared and pretreated with oxygen at different temperatures. The samples calcined at 300 and 400 degreesC have poor activities for CO oxidation, while oxygen reacts totally with H-2 at temperatures of 160 and 120 degreesC, respectively. It becomes catalytically active after treatment with oxygen at 500 degreesC, and the activity increases with the treatment temperature up to 700 degreesC, reaching nearly the same level of CO conversion as that of the 8%Ag/SiO2 prepared by the incipient wetness impregnation method and treated with He at 500 degreesC. XRD and TEM results show that calcinations under oxygen atmosphere between 500 and 700 degreesC help dispersing the silver nanoparticles on the surface Of SiO2, as well as induce an interaction between the silver nanoparticles and SiO2. Moreover, the ability of CO adsorption at low temperatures is obviously enhanced. However, further increasing the pretreatment temperature decreases the catalytic activity due to the heat-induced aggregation of silver nanoparticles on the surface Of SiO2 and the corresponding decrease of the CO adsorption ability, but higher than that of the initial Ag-SiO2 mixture. CO adsorbed on the Ag nanoparticles dispersed on the surface of silica shows a high activity toward CO selective oxidation, and it is proved that the sub-surface oxygen species plays a very important role in this reaction. (C) 2004 Published by Elsevier B.V.
关键词[WOS]: NOBLE-METAL CATALYSTS ;  CARBON-MONOXIDE ;  FILMS
语种: 英语
WOS记录号: WOS:000223973200034
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138435
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.Dalian Univ Technol, Dalian 116024, Peoples R China

Recommended Citation:
Qu, ZP,Cheng, MJ,Dong, XL,et al. CO selective oxidation in H-2-rich gas over Ag nanoparticles - effect of oxygen treatment temperature on the activity of silver particles mechanically mixed with SiO2[J]. CATALYSIS TODAY,2004,93-5:247-255.
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