Absorption/desorption of NOx process on perovskites - Nature and stability of the species formed on BaSnO3

被引：49

作者：

Hodjati, S ^{[1
]}

Petit, C ^{[1
]}

Pitchon, V ^{[1
]}

Kiennemann, A ^{[1
]}

机构：

[1] ECPM, CNRS, UMR 7515, Lab Etud React Catalyt Surfaces & Interfaces, F-67087 Strasbourg 2, France

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2000年 / 27卷 / 02期

关键词：

NOx trap; NOx; perovskites; Lean-Burn test;

D O I：

10.1016/S0926-3373(00)00139-9

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：

The formation of various species during the adsorption of NOx, issuing from a synthetic, Lean-Burn exhaust gas upon BaSnO3 was studied using FTIR and TGA. An exposure to CO2 does not lead to the formation of carbonates yet contact with NO2 does produce nitrates, which accounts for the high NOx capacity of such solids. N-bounded nitrate and bulk nitrate species were identified. These nitrates decompose upon heating with no loss of the perovskite structure. The process of absorption/desorption is reversible, repeatable and can be explained by the following equations: Absorption phase : BaSnO3 + 3NO(2) <-> Ba(NO3)(2) + SnO2 + NO, Desorption phase : Ba(NO3)(2) + SnO2 <-> BaSnO3 + 2NO(2) + 1/2 O-2. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：117 / 126

页数：10

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