# 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.

 PDF Investigations_of_Fe-Ru_bimetallic_catalysts_by_in_situ_Mössbauer_and_EXAFS_studies.pdf Restricted to Registered users only Download (794kB) | Request a copy

## 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 Copyright of this article belongs to J.C. Baltzer A.G. Scientific Publishing Company. Bimetallic catalysts;hydrogenation catalysts;Fe-Ru/SiO2;supported Fe-Ru catalysts;Fe/SiO2 Division of Chemical Sciences > Solid State & Structural Chemistry Unit Srinivasa Naika 10 Dec 2007 19 Sep 2010 04:41 http://eprints.iisc.ac.in/id/eprint/12756