Elucidation of Lean-NOx reduction mechanism using kinetic isotope effect

被引：12

作者：

Cho, BK ^{[1
]}

机构：

[1] GM Corp, Ctr Res & Dev, Phys & Phys Chem Dept, Warren, MI 48090 USA

来源：

JOURNAL OF CATALYSIS | 1998年 / 178卷 / 02期

关键词：

D O I：

10.1006/jcat.1998.2169

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of an NO isotope on the kinetics of lean-NOx catalysis in (NO + C2H4 + O-2) reaction mixtures over Pt-ZSM-5 was theoretically analyzed and compared with experimental data obtained with a fixed-bed plug-flow reactor. The large kinetic isotope effect, as well as kinetic oscillations observed previously, was explained by NO decomposition kinetics on Pt surfaces which undergo phase transition between (1 x 1) and (hex) phases induced by adsorbed reactant species. Results indicate the importance of NO decomposition kinetics in lean-NOx catalysis, lending further support to a lean-NOx reduction mechanism which involves NO decomposition accompanied by hydrocarbon oxidation. (C) 1998 Academic Press.

引用

页码：395 / 407

页数：13

共 44 条

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