Mössbauer Effect Characterization of Silica Supported Rhodium-Iron Catalysts
Silica supported rhodium-iron catalysts were characterized with iron-57 Mössbauer spectra indicated that iron in the catalysts existed as iron(0) in the rhodium-iron alloy and iron(III) stabilized through the metal-support interaction. A part of iron(III) combined the rhodium-iron alloy and the silica as an anchor. The iron(III) to iron(0) ratio and Mössbauer effect parameters were found to depend on the iron to rhodium ratio in the catalysts. Their dependences correspond to the change of the catalytic properties of rhodium-iron catalysts with the iron content. A schematic model for the surface structure of the rhodium-iron catalysts is proposed. The Mössbauer spectra of rhodium-iron catalysts with various metal loading supported this model.
KeywordsTitanium Zirconium Hydrocarbon Carbon Monoxide Expense
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