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

✍ Scribed by B. Azambre; L. Zenboury; F. Delacroix; J.V. Weber

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 378 KB
Volume: 137
Category: Article
ISSN: 0920-5861
DOI: 10.1016/j.cattod.2007.09.003

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✦ Synopsis

In this study, the nature of surface intermediates generated by adsorption of NO and NO 2 on a commercial ceria-zirconia powder of composition Ce 0.69 Zr 0.31 O 2 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 x molecule. On the partially reduced ceria-zirconia, the primary role of NO x 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 NO 2 adsorption only.

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