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题名: Unique properties of Ir/ZSM-5 catalyst for NO reduction with CO in the presence of excess oxygen
作者: Wang, AQ;  Ma, L;  Cong, Y;  Zhang, T;  Liang, DB
关键词: Ir/ZSM-5 ;  Pt/ZSM-5 ;  NO+CO+O-2 ;  NO reduction ;  TPD
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
发表日期: 2003-02-28
卷: 40, 期:4, 页:319-329
收录类别: SCI
文章类型: Article
部门归属: 1503
项目归属: 1503
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: The 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.
关键词[WOS]: NOBLE-METAL CATALYSTS ;  NITRIC-OXIDE ;  OXIDATION ;  REMOVAL ;  METHANE ;  ZEOLITE ;  MIXTURES ;  IGNITION ;  STATE ;  FTIR
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000181374900007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82489
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, Dalian 116023, Peoples R China

Recommended Citation:
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.
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