Model studies of NOx storage and sulphur deactivation of NOx storage catalysts

被引：84
|
作者：
Fridell, E [1 ]
Persson, H
Olsson, L
Westerberg, B
Amberntsson, A
Skoglundh, M
机构：
[1] Chalmers Univ Technol, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden
[2] Chalmers Univ Technol, Dept Appl Phys, SE-41296 Gothenburg, Sweden
[3] Chalmers Univ Technol, Dept Chem React Engn, SE-41296 Gothenburg, Sweden
[4] Chalmers Univ Technol, Dept Surface Chem, SE-41296 Gothenburg, Sweden
来源：
TOPICS IN CATALYSIS | 2001年 / 16卷 / 1-4期
关键词：
NOx reduction; lean-burn; NOx storage; sulphur deactivation; storage mechanism;
D O I：
10.1023/A:1016699202043
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
The storage of NOx under lean conditions in model NOx storage catalysts as well as the deactivation by sulphur have been studied. We find that NO2 plays an important role in the storage mechanism as an oxidising agent. Two different mechanisms for this are discussed: the formation of surface peroxides and the oxidation of nitrites to nitrates, FTIR studies show that NOx is stored as surface nitrates, The sulphur deactivation is found to be more severe when SO2 is added during the rich phase than when SO2 is added during the lean period. FTIR shows the formation of bulk sulphates both under lean and rich conditions.
引用
收藏
页码：133 / 137
页数：5
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