An in situ EXAFS investigation of bimetallic Cu---Ni/γ-Al2O3 catalysts

Kulkarni, GU and Rao, CNR and Sankar, G (1991) An in situ EXAFS investigation of bimetallic Cu---Ni/γ-Al2O3 catalysts. In: Journal of Catalysis, 131 (2). pp. 491-501.

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Abstract

In situ EXAFS investigations have been carried out on Ni/γ-Al2O3 and Cu---Ni/γ-Al2O3 catalysts with different metal loadings, and prepared by different procedures. As-prepared Ni/γ-Al2O3 on calcination gives NiO and NiAl2O4-like phases on the surface, the proportion of the latter increasing with the increase in calcination temperature; the proportion of the NiO-like phase, on the other hand, increases with the metal loading. The reducibility of Ni/γ-Al2O3 to give metallic Ni on the surface directly depends on the proportion of the NiO-like phase present before reduction. Co-impregnating with Cu suppresses the formation of the surface aluminate and thereby favours the reduction to metallic Ni. This conclusion is clearly substantiated by our studies of bimetallic catalysts containing varying Cu/Ni ratios and also those prepared by the two-stage impregnation procedure.

Item Type:	Journal Article
Publication:	Journal of Catalysis
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	11 Nov 2010 06:32
Last Modified:	11 Nov 2010 06:32
URI:	http://eprints.iisc.ac.in/id/eprint/33624

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