DICP OpenIR
Unique properties of Ir/ZSM-5 catalyst for NO reduction with CO in the presence of excess oxygen
Wang, AQ; Ma, L; Cong, Y; Zhang, T; Liang, DB
KeywordIr/zsm-5 Pt/zsm-5 no+co+o-2 No Reduction Tpd
Source PublicationAPPLIED CATALYSIS B-ENVIRONMENTAL
2003-02-28
Volume40Issue:4Pages:319-329
Indexed BySCI
SubtypeArticle
Department1503
Funding Project1503
Contribution Rank1;1
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
WOS KeywordNOBLE-METAL CATALYSTS ; NITRIC-OXIDE ; OXIDATION ; REMOVAL ; METHANE ; ZEOLITE ; MIXTURES ; IGNITION ; STATE ; FTIR
AbstractThe reduction of NO with CO in the presence of excess oxygen was investigated over different noble metal catalysts for probing the relationship between catalytic properties and adsorption behaviors. Among the four precious metal catalysts investigated, Ir/ZSM-5 was found to be the only active one for NO reduction with CO under lean conditions. With the decreasing of the Ir content, higher NO conversion and CO selectivity was obtained. Temperature-programmed reaction (TPR) studies of NO/H-2/O-2 and NO/CO/O-2 showed that the Pt/ZSM-5 was active when H-2 was used as the reductant, whereas, the Ir/ZSM-5 was active when CO was the reducing agent. This difference is due to the different mechanisms of the two reactions. Temperature-programmed desorption (TPD) of NO, CO and O-2 showed that NO could dissociate more easily over the Ir/ZSM-5 than on the Pt/ZSM-5, while the oxidation of CO by O-2 proceeded more rapidly on the Pt/ZSM-5 than on the Ir/ZSM-5. The presence of excess O-2 inhibited drastically the dissociation of NO, which is considered as the key step for the NO-CO reaction. The high dissociation rate of NO over the Ir/ZSM-5 is visualized as the key factor for its superior high activity in NO reduction with CO under lean conditions. (C) 2002 Elsevier Science B.V. All rights reserved.
Language英语
URL查看原文
WOS IDWOS:000181374900007
Citation statistics
Cited Times:62[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/82489
Collection中国科学院大连化学物理研究所
AffiliationChinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
Recommended Citation
GB/T 7714
Wang, AQ,Ma, L,Cong, Y,et al. Unique properties of Ir/ZSM-5 catalyst for NO reduction with CO in the presence of excess oxygen[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2003,40(4):319-329.
APA Wang, AQ,Ma, L,Cong, Y,Zhang, T,&Liang, DB.(2003).Unique properties of Ir/ZSM-5 catalyst for NO reduction with CO in the presence of excess oxygen.APPLIED CATALYSIS B-ENVIRONMENTAL,40(4),319-329.
MLA Wang, AQ,et al."Unique properties of Ir/ZSM-5 catalyst for NO reduction with CO in the presence of excess oxygen".APPLIED CATALYSIS B-ENVIRONMENTAL 40.4(2003):319-329.
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