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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
关键词Ir/zsm-5 Pt/zsm-5 no+co+o-2 No Reduction Tpd
刊名APPLIED CATALYSIS B-ENVIRONMENTAL
2003-02-28
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
关键词[WOS]NOBLE-METAL CATALYSTS ; NITRIC-OXIDE ; OXIDATION ; REMOVAL ; METHANE ; ZEOLITE ; MIXTURES ; IGNITION ; STATE ; FTIR
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.
语种英语
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WOS记录号WOS:000181374900007
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被引频次:62[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/321008/82489
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
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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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