An investigation of the NO/H2/O2 reaction on noble-metal catalysts at low temperatures under lean-burn conditions

被引：172

作者：

Burch, R ^{[1
]}

Coleman, MD ^{[1
]}

机构：

[1] Univ Reading, Dept Chem, Ctr Catalysis Res, Reading RG6 6AD, Berks, England

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 1999年 / 23卷 / 2-3期

关键词：

Pt catalysts; NO reduction by hydrogen; lean-burn; N2O selectivity;

D O I：

10.1016/S0926-3373(99)00073-9

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 NO/H-2/O-2 reaction has been studied under lean-burn conditions at low temperatures. Maxima in the NO conversions have been observed for a Pt/Al2O3 catalyst at 140 degrees C (50% conversion) and for a 1% Pt/SiO2 catalyst at 90 degrees C (75% conversion). The selectivity to N2O is sensitive to the reaction conditions and decreases as the temperature is raised. Addition of water has a noticeable effect on both the activity and the selectivity for the NO reduction reaction, with N-2 formation being significantly decreased when water is introduced into the reaction mixture. The effect of varying the NO and H-2 concentrations has been examined. In general, increasing the NO concentration lowers the activity, whereas increasing the H-2 concentration increases the activity for NO reduction. The effect of these concentration changes on the selectivity to N2O is complex. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：115 / 121

页数：7