Absorption/desorption of NOx process on perovskites:: performances to remove NOx from a lean exhaust gas

被引：95

作者：

Hodjati, S ^{[1
]}

Vaezzadeh, K ^{[1
]}

Petit, C ^{[1
]}

Pitchon, V ^{[1
]}

Kiennemann, A ^{[1
]}

机构：

[1] ECPM, CNRS, UMR 7515, LERCSI, F-67087 Strasbourg 2, France

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2000年 / 26卷 / 01期

关键词：

NOx trap catalyst; diesel; lean-burn; perovskites;

D O I：

10.1016/S0926-3373(99)00143-5

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：

NOx adsorption/desorption capacities of perovskites (ABO(3)) were measured under representative exhaust gas mixture conditions at temperatures below 550 degrees C, with A=Ca, Sr, Ba and B=Sn, Zr, Ti. The solids exhibited good NO2 sorption capacities with a reversible adsorption to desorption process according to the sequence Ba>Sr>Ca for A, while for element B the sequence Sn>Zn>Ti is observed. In the case of alkaline earth metals, the absorption behaviour proved to be directly related to their electropositivity (Ba>Sr>Ca). The key factors which control the absorption of NO2 are the bonding energy between the element B and the oxygen atom on one hand and the electropositivity of the element A on the other. The best result was obtained with the perovskite BaSnO3. The absorption of NO2 is favoured at low temperature and in the presence of water. The addition of platinum has no significant influence upon any NO2 absorption. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：5 / 16

页数：12

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