N2O as an intermediate for the formation of N2 during SCR (NO):: stationary and transient conditions

被引:16
作者
Denton, P
Schuurman, Y
Giroir-Fendler, A
Praliaud, H
Primet, M
Mirodatos, C
机构
[1] Univ Lyon 1, LACE, CNRS, UMR 5634, F-69622 Villeurbanne, France
[2] Inst Rech Catalyse, CNRS, UPR 5401, F-69626 Villeurbanne, France
来源
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE C-CHIMIE | 2000年 / 3卷 / 06期
关键词
DeNO(x); selective nitric oxide reduction; SCR (NO); Pt supported catalysts; temporal analysis of products; TAP; reaction mechanism;
D O I
10.1016/S1387-1609(00)00149-3
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Platinum-based catalysts can be used for the selective reduction of NOx in lean burn conditions, but they form undesirably high quantities of N2O. In this study conducted under stationary and transient conditions, we attempted to better understand the mechanism of SCR (NO) over Pt. Me found that N-2 selectivity increased with contact time, that significant quantities of N-2 were formed when N2O was used as the reactant, and that N2O was formed more quickly than N-2 when NO was used as the reactant. These results led us to propose a kinetic model in which adsorbed N2O is an intermediate for NO reduction into N-2. (C) 2000 Academie des sciences Editions scientifiques et medicales Elsevier SAS.
引用
收藏
页码:437 / 441
页数:5
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