NOx storage-reduction catalyst (NSR catalyst) for automotive engines:: Sulfur poisoning mechanism and improvement of catalyst performance

被引：10

作者：

Miyoshi, N ^{[1
]}

Mastumoto, S ^{[1
]}

机构：

[1] Toyota Motor Corp, Mat Engn Div 1, Catalyst Design Dept, Aichi 4718572, Japan

来源：

SCIENCE AND TECHNOLOGY IN CATALYSIS 1998 | 1999年 / 121卷

关键词：

D O I：

10.1016/S0167-2991(99)80074-3

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

NOx storage-reduction catalysts (NSR catalysts) have developed for lean-burn and gasoline direct injection engines. One of the main causes of deterioration of NSR catalysts is sulfur poisoning. SO2 is oxidized on the precious metal and reacts with the NOx storage compounds to form sulfates. The decomposition of formed sulfates is essential to improve the durability of the catalyst. The composition of NOx storage components and acidity of supports are optimized to minimize the growth of the size of sulfate particles. The enhancement of the dispersion of the precious metal also affects sulfate decomposition.

引用

页码：245 / 250

页数：6