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Studies of silver species for low-temperature CO oxidation on Ag/SiO2 catalysts
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
2010-05-11
DOI10.1016/j.seppur.2010.03.012
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
关键词[WOS]SELECTIVE OXIDATION ; AG NANOPARTICLES ; ETHYLENE EPOXIDATION ; SUBSURFACE OXYGEN ; NOX REDUCTION ; METHANE ; PERFORMANCE ; AG/AL2O3 ; SYSTEM ; OXIDE
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.
语种英语
WOS记录号WOS:000277662200022
引用统计
被引频次:68[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/321008/141712
专题中国科学院大连化学物理研究所
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
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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.
APA Zhang, Xiaodong.,Qu, Zhenping.,Li, Xinyong.,Wen, Meng.,Quan, Xie.,...&Wu, Jingjing.(2010).Studies of silver species for low-temperature CO oxidation on Ag/SiO2 catalysts.SEPARATION AND PURIFICATION TECHNOLOGY,72(3),395-400.
MLA Zhang, Xiaodong,et al."Studies of silver species for low-temperature CO oxidation on Ag/SiO2 catalysts".SEPARATION AND PURIFICATION TECHNOLOGY 72.3(2010):395-400.
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