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Investigations of Fe-Ru bimetallic catalysts by in situ Mössbauer and EXAFS studies

Kannan, KR and Kulkarni, GU and Rao, CNR (1992) Investigations of Fe-Ru bimetallic catalysts by in situ Mössbauer and EXAFS studies. In: Catalysis Letters, 14 (2). pp. 149-163.

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Abstract

In situ Mössbauer and EXAFS investigations have shown that the reduction of iron in the monometallic $Fe/SiO_2$ catalyst is only partial, the reduction being mostly to a ferrous silicate phase. In the bimetallic $Fe-Ru/SiO_2$ catalysts, the proportion of the FeRu alloy formed on reduction increases markedly with the increase in Ru content; clearly, Ru significantly enhances the reduction of iron on $SiO_2$. In the Ru-rich compositions (Ru/Fe 1.0), most of the iron is present in the alloy phase and there is no segregation of \alpha-Fe. A comparative study of the different supports has shown that $\gamma-Al_2O_3 and SiO_2$ interact with iron strongly at low reduction temperatures while the $TiO_2$ support interacts at higher temperatures. The presence of traces of $Fe^{3+}$ often found in reduced Fe-Ru catalysts is shown to arise from the oxidation of fine segregated iron particles on the support.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to J.C. Baltzer A.G. Scientific Publishing Company.
Keywords: Bimetallic catalysts;hydrogenation catalysts;Fe-Ru/SiO2;supported Fe-Ru catalysts;Fe/SiO2
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 10 Dec 2007
Last Modified: 19 Sep 2010 04:41
URI: http://eprints.iisc.ernet.in/id/eprint/12756

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