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题名: Investigation on the catalytic roles of silver species in the selective catalytic reduction of NOx with methane
作者: Shi, C;  Cheng, MJ;  Qu, ZP;  Bao, XH
关键词: silver catalysts ;  selective catalytic reduction ;  NOx
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2004-08-10
DOI: 10.1016/j.apcatb.2003.12.003
卷: 51, 期:3, 页:171-181
收录类别: SCI
文章类型: Article
项目归属: 502
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Environmental ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Silver impregnated H-ZSM-5 zeolite catalysts with silver loading from 3 to 15 wt.% were investigated for the selective catalytic reduction (SCR) of NOx with CH4 in the excess of oxygen. X-ray diffraction (XRD) and UV-Vis measurements established the structure of silver catalysts. A relationship between the structure of silver catalysts and their catalytic functions for the SCR of NOx by CH4 was clarified. The NO conversion to N-2 showed a S-shape dependence on the increase of Ag loading. No linear dependence of catalytic activity on the amount of silver ions in the zeolite cation sites was observed. Contrastively, the activity was significantly enhanced by the nano-sized silver particles formed on the higher Ag loading samples (greater than or equal to7 wt.%). Temperature programmed desorption (TPD) and temperature programmed reduction (TPR) studies showed that nano-silver particles provided much stronger adsorption centers for active intermediates NO3-(s) on which adsorbed NO3-(s) could be effectively reduced by the activated methane. Silver ions in the zeolite cation sites might catalyze the reaction through activation of CH4 at lower temperatures. Activated CH4 reacted with NO3-(s) adsorbed on nano-silver particles to produce N-2 and CO2. (C) 2003 Elsevier B.V. All rights reserved.
关键词[WOS]: SUPPORTED AG CATALYSTS ;  ZEOLITE CATALYSTS ;  NITRIC-OXIDE ;  ALUMINA CATALYSTS ;  NITROGEN MONOXIDE ;  SUBSURFACE OXYGEN ;  EXCHANGED ZSM-5 ;  ACTIVE-SITES ;  Y-ZEOLITES ;  HYDROCARBONS
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000222130900005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82641
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 Inst Light Ind, Inorgan & Analyt Chem Lab, Dalian 116034, Peoples R China

Recommended Citation:
Shi, C,Cheng, MJ,Qu, ZP,et al. Investigation on the catalytic roles of silver species in the selective catalytic reduction of NOx with methane[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2004,51(3):171-181.
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