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Investigation on the catalytic roles of silver species in the selective catalytic reduction of NOx with methane; Investigation on the catalytic roles of silver species in the selective catalytic reduction of NOx with methane
Shi, C; Cheng, MJ; Qu, ZP; Bao, XH
KeywordSilver Catalysts Silver Catalysts Selective Catalytic Reduction Selective Catalytic Reduction Nox Nox
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL ; APPLIED CATALYSIS B-ENVIRONMENTAL
2004-08-10 ; 2004-08-10
DOI10.1016/j.apcatb.2003.12.003 ; 10.1016/j.apcatb.2003.12.003
Volume51Issue:3Pages:171-181
Indexed BySCI ; SCI
SubtypeArticle ; Article
Funding Project502 ; 502
Contribution Rank1;1 ; 1;1
WOS HeadingsScience & Technology ; Science & Technology ; Physical Sciences ; Physical Sciences ; Technology ; Technology
WOS SubjectChemistry, Physical ; Chemistry, Physical ; Engineering, Environmental ; Engineering, Environmental ; Engineering, Chemical ; Engineering, Chemical
WOS Research AreaChemistry ; Chemistry ; Engineering ; Engineering
WOS KeywordSUPPORTED AG CATALYSTS ; SUPPORTED AG CATALYSTS ; ZEOLITE CATALYSTS ; ZEOLITE CATALYSTS ; NITRIC-OXIDE ; NITRIC-OXIDE ; ALUMINA CATALYSTS ; ALUMINA CATALYSTS ; NITROGEN MONOXIDE ; NITROGEN MONOXIDE ; SUBSURFACE OXYGEN ; SUBSURFACE OXYGEN ; EXCHANGED ZSM-5 ; EXCHANGED ZSM-5 ; ACTIVE-SITES ; ACTIVE-SITES ; Y-ZEOLITES ; Y-ZEOLITES ; HYDROCARBONS ; HYDROCARBONS
AbstractSilver 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.; 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.
Language英语 ; 英语
URL查看原文 ; 查看原文
WOS IDWOS:000222130900005 ; WOS:000222130900005
Citation statistics
Cited Times:47[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/82641
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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, Investigation on the catalytic roles of silver species in the selective catalytic reduction of NOx with methane[J]. APPLIED CATALYSIS B-ENVIRONMENTAL, APPLIED CATALYSIS B-ENVIRONMENTAL,2004, 2004,51, 51(3):171-181, 171-181.
APA Shi, C,Cheng, MJ,Qu, ZP,&Bao, XH.(2004).Investigation on the catalytic roles of silver species in the selective catalytic reduction of NOx with methane.APPLIED CATALYSIS B-ENVIRONMENTAL,51(3),171-181.
MLA Shi, C,et al."Investigation on the catalytic roles of silver species in the selective catalytic reduction of NOx with methane".APPLIED CATALYSIS B-ENVIRONMENTAL 51.3(2004):171-181.
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