Adsorption of NO and NO2 on ceria-zirconia of composition Ce0.69Zr0.31O2:: A DRIFTS study

被引：51

作者：

Azambre, B. ^{[1
]}

Zenboury, L. ^{[1
]}

Delacroix, F. ^{[2
]}

Weber, J. V. ^{[1
]}

机构：

[1] Univ Paul Verlaine Metz, LCME, F-57500 St Avold, France

[2] ADEME, F-49004 Angers, France

来源：

CATALYSIS TODAY | 2008年 / 137卷 / 2-4期

关键词：

ceria-zirconia; CexZr1-xO2; adsorption; NOx; DRIFTS; nitrates;

D O I：

10.1016/j.cattod.2007.09.003

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

In this study, the nature of surface intermediates generated by adsorption of NO and NO2 on a commercial ceria-zirconia powder of composition Ce0.69Zr0.31O2 was investigated using Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). The conditions of occurrence of the main adsorbed species, i.e. nitrites and nitrates, are studied semi-quantitatively as a function of catalyst pre-treatment and/or type of adsorbed NO, molecule. On the partially reduced ceria-zirconia, the primary role of NOx is to re-oxidize the surface via adsorption/decomposition on reduced sites. By contrast, the formation of nitrites and nitrates readily occurs on oxidized surfaces, the latter kind of species being strongly promoted in the case of NO2 adsorption only. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：278 / 282

页数：5

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