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# Extended X-ray Absorption Fine Structure Studies of Bimetallic ${Cu-Ni/ \gamma -$Al_2O_3$}$ Catalysts

Sankar, G and Vasudevan, S and Rao, CNR (1986) Extended X-ray Absorption Fine Structure Studies of Bimetallic ${Cu-Ni/ \gamma -$Al_2O_3$}$ Catalysts. In: Journal of Physical Chemistry, 90 (21). pp. 5325-5328.

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## Abstract

The nature of the species and their local structure in reduced $Cu-Ni/ \gamma -Al_20_3$ catalysts have been investigated over the entire composition range. Nickel is present in the form of $Ni$ metal as well as $Ni^{2+}$ , the latter in both octahedral and tetrahedral environments; copper is present as Cu metal and as a $Cu_2O$-like phase. Analysis of the $EXAFS$ of these multiphasic catalysts has been carried out employing an additive relation for the EXAFS function and making use of residual spectra. The concentration of $Ni^0$ relative to $Ni^{2+}$ increases with increase in copper content; similarly, the concentration of $Cu^0$ relative to $Cu^+$ increases with the proportion of nickel.

Item Type: Journal Article Copyright of this article belongs to American Chemical Society. Division of Chemical Sciences > Solid State & Structural Chemistry UnitDivision of Chemical Sciences > Inorganic & Physical Chemistry 16 Jul 2008 19 Sep 2010 04:47 http://eprints.iisc.ernet.in/id/eprint/14923

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