The effect of exothermic reactions during regeneration on the NOX trapping efficiency of a NOX storage/reduction catalyst

被引：40

作者：

Epling, William S.

Yezerets, Aleksey

Currier, Neal W.

机构：

[1] Univ Waterloo, Dept Chem Engn, Waterloo, ON N2L 3G1, Canada

[2] Cummins Inc, Columbus, IN 47201 USA

来源：

CATALYSIS LETTERS | 2006年 / 110卷 / 1-2期

关键词：

NOX storage; NOX reduction; diesel emissions;

D O I：

10.1007/s10562-006-0102-2

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：

An unusual behavior was observed during experiments conducted at 371 and 465 degrees C with a commercial NOX storage/reduction catalyst: the outlet NOX concentration during the trapping phase reached a cycle minimum after regeneration, increased for 20-30 s, as expected, but then surprisingly decreased, indicating the catalyst had become more efficient in trapping the entering NOX. The results reported in this letter indicate that this phenomenon was caused by a superposition of two factors: a substantial exotherm associated with the regeneration event from reductant reacting with surface oxygen species and a negative impact of an evolving temperature profile on the dynamic NOX storage capacity.

引用

收藏

页码：143 / 148

页数：6

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