ISSN:
1572-879X
Keywords:
Bimetallic catalysts
;
hydrogenation catalysts
;
Fe-Ru/SiO2
;
supported Fe-Ru catalysts
;
Fe/SiO2
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract In situ Mössbauer and EXAFS investigations have shown that the reduction of iron in the monometallic Fe/SiO2 catalyst is only partial, the reduction being mostly to a ferrous silicate phase. In the bimetallic Fe-Ru/SiO2 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 SiO2. 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 α-Fe. A comparative study of the different supports has shown that γ-Al2O3 and SiO2 interact with iron strongly at low reduction temperatures while the TiO2 support interacts at higher temperatures. The presence of traces of Fe3+ often found in reduced Fe-Ru catalysts is shown to arise from the oxidation of fine segregated iron particles on the support.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00765229
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