NO Adsorption on ZnAl2O4/Al2O3 Powder: A NEXAFS Study at the Nitrogen K Edge

In order to understand the mechanism of the selective catalysis of nitrogen oxide reduction by hydrocarbons on a ZnAl2O4/Al2O3 catalyst, the NO adsorption step has been studied as a function of the surface state of the catalyst by using near-edge X-ray absorption fine structure (NEXAFS) spectroscopy...

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Bibliographic Details
Published inCatalysis letters Vol. 74; no. 3-4; pp. 189 - 192
Main Authors Revel, R, Bazin, D, Parent, P, Laffon, C
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Nature B.V 01.07.2001
Subjects
Adsorption
Aluminum oxide
Catalysis
Catalysts
Fine structure
Nitric oxide
Nitrogen
Nitrogen oxides
Oxidation
Soft x rays
Surface chemistry
X ray absorption
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Summary:In order to understand the mechanism of the selective catalysis of nitrogen oxide reduction by hydrocarbons on a ZnAl2O4/Al2O3 catalyst, the NO adsorption step has been studied as a function of the surface state of the catalyst by using near-edge X-ray absorption fine structure (NEXAFS) spectroscopy at the nitrogen K edge. The role of oxygen, whose presence is essential for the reaction to occur, is examined. In absence of a preliminary surface oxidation, nitric oxide was found not to be adsorbed on the ZnAl2O4/Al2O3 surface. After this preliminary treatment, we observed that the nitrogen atom of the NO molecule was linked to a surface oxygen with an adsorption mode parallel or slightly tilted with respect to the catalyst surface. Through these experiments we clearly demonstrate the advantages of soft X-ray experiments in catalysis research even in the case of practical application to real materials.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1016637215044