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NO adsorption on ZnAl2 O4/Al2O3 powder: a NEXAFS study at the nitrogen K edge

Abstract : In order to understand the mechanism of the selective catalysis of nitrogen oxide reduction by hydrocarbons on a ZnAl2 O4 /Al2 O3 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 ZnAl2 O4 /Al2 O3 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.
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https://hal-cea.archives-ouvertes.fr/cea-00442988
Contributor : Dominique Bazin <>
Submitted on : Saturday, December 26, 2009 - 4:37:42 PM
Last modification on : Wednesday, October 14, 2020 - 3:45:32 AM

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  • HAL Id : cea-00442988, version 1

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Dominique Bazin, Revel R, Philippe Parent, Lafon Karine. NO adsorption on ZnAl2 O4/Al2O3 powder: a NEXAFS study at the nitrogen K edge. Catalysis Letters, Springer Verlag, 2001, 74, pp.189 - 192. ⟨cea-00442988⟩

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