Non-isothermal NOx storage/release over manganese based traps:: mechanistic considerations

被引：4
|
作者：
Fricke, R [1 ]
Schreier, E [1 ]
Eckelt, R [1 ]
Richter, M [1 ]
Trunschke, A [1 ]
机构：
[1] Inst Appl Chem ACA, D-12474 Berlin, Germany
来源：
TOPICS IN CATALYSIS | 2004年 / 30-1卷 / 1-4期
关键词：
NOx storage; mechanism; nitrite; nitrate; manganese oxide; modelling;
D O I：
10.1023/B:TOCA.0000029749.99195.ab
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The NO storage properties of MnOx/support materials (5-50 wt% MnOx loading) was experimentally investigated in the presence of O-2 and H2O between 50 and 700 degreesC applying a non-isothermal temperature-programmed method. In dependence on MnOx loading and NO supply, the materials show an intermediate decrease of NO storage capacity between 200 and 300 degreesC. This effect is caused by decomposition of surface nitrites with release of NO into the gas phase as proved by in situ DRIFT measurement. The interpretation is corroborated by modelling of the underlying adsorption/desorption reaction steps, considering the different thermal stability of nitrite/nitrate surface species.
引用
收藏
页码：193 / 198
页数：6
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