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

被引：0
|
作者：
Rolf Fricke
Ellen Schreier
Reinhard Eckelt
Manfred Richter
Annette Trunschke
机构：
[1] Institute for Applied Chemistry (ACA),
来源：
Topics in Catalysis | 2004年 / 30-31卷
关键词：
NO; storage; mechanism; nitrite; nitrate; manganese oxide; modelling;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The NO storage properties of MnOx/support materials (5–50 wt% MnOx loading) was experimentally investigated in the presence of O2 and H2O between 50 and 700 °C 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 °C. 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.
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页码：193 / 198
页数：5
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