SELECTIVE REDUCTION OF NITROGEN-OXIDES UNDER OXIDIZING EXHAUST-GAS CONDITIONS

被引：90
|
作者：
BENNETT, CJ
BENNETT, PS
GOLUNSKI, SE
HAYES, JW
WALKER, AP
机构：
[1] Johnson Matthey Technology Centre, Reading, RG4 9NH, Blount's Court, Sonning Common
来源：
APPLIED CATALYSIS A-GENERAL | 1992年 / 86卷 / 02期
关键词：
EXHAUST-GAS; KINETICS; NO; MECHANISM; SELECTIVE REDUCTION;
D O I：
10.1016/0926-860X(92)85137-Z
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：
Temperature-programmed reaction traces for Cu/ZSM-5 heated under an oxidising exhaust-gas are not consistent with the hydrocarbon acting as a direct reductant of NO. Steady-state kinetic studies eliminate another possible mechanism (catalytic decomposition of NO), but reveal a near first order dependence of NO conversion on propene partial pressure. The results are reconciled by a surface mechanism in which the hydrocarbon generates a reactive intermediate capable of reducing NO, but which itself can be depleted by oxidation. This intermediate may be a partial oxidation product of the hydrocarbon, or deposited coke; it does not appear to be CO.
引用
收藏
页码：L1 / L6
页数：6
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