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题名: Studies of silver species for low-temperature CO oxidation on Ag/SiO2 catalysts
作者: Zhang, Xiaodong1, 2;  Qu, Zhenping1, 2;  Li, Xinyong1, 2;  Wen, Meng1, 2;  Quan, Xie1, 2;  Ma, Ding3;  Wu, Jingjing3
关键词: Ag/SiO2 ;  CO oxidation ;  Active species ;  Particle size
刊名: SEPARATION AND PURIFICATION TECHNOLOGY
发表日期: 2010-05-11
DOI: 10.1016/j.seppur.2010.03.012
卷: 72, 期:3, 页:395-400
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Technology
类目[WOS]: Engineering, Chemical
研究领域[WOS]: Engineering
英文摘要: The active species and particle size of silver catalysts for CO oxidation were discussed in this paper by investigating the effects of Ag loading and different pretreatments on the crystallite structure of silver catalysts. It was found that 8 wt% Ag/SiO2 catalyst pretreated with O-2 at 500 degrees C exhibited high catalytic performance (T-98 = 65 degrees C).When the catalyst further treated with H-2 at 200 degrees C following O-2 treatment, a better catalytic performance (T-98 = 50 degrees C) was obtained. However, it was decreased with the increase the reduction temperature to 300 degrees C. Crystallite Ag and Ag2O species were observed after O-2 pretreatment at 500 degrees C. Subsequent H-2 treatment at low temperatures (50-200 degrees C) caused the reduction of Ag2O species, the formation of Ag-n(delta+) clusters and the high dispersion of crystallite silver. Reduction at high temperature (>200 degrees C) resulted in decreased amount of the oxygen species and the aggregation of metallic silver particles, which were confirmed by the disappearance of the Ag-n(delta+) clusters and the sharpening of the band centered at 410 nm. Therefore, oxygen-containing Ag species might be proposed as the active species and silver particle size of ca. 4.5-5.5 nm would be favorable for the low-temperature CO oxidation. (C) 2010 Elsevier B.V. All rights reserved.
关键词[WOS]: SELECTIVE OXIDATION ;  AG NANOPARTICLES ;  ETHYLENE EPOXIDATION ;  SUBSURFACE OXYGEN ;  NOX REDUCTION ;  METHANE ;  PERFORMANCE ;  AG/AL2O3 ;  SYSTEM ;  OXIDE
语种: 英语
WOS记录号: WOS:000277662200022
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141712
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.Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Peoples R China
2.Dalian Univ Technol, Sch Environm Sci & Technol, State Key Lab Fine Chem, Dalian 116024, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Zhang, Xiaodong,Qu, Zhenping,Li, Xinyong,et al. Studies of silver species for low-temperature CO oxidation on Ag/SiO2 catalysts[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2010,72(3):395-400.
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