Abstract
The reduction behavior of silica supported iron and platinum-iron catalysts were studied by combinedin situ temperature programmed reduction (TPR)-Mossbauer Spectroscopy (MBS). The results indicated that the TPR profiles of the supported Fe catalysts were different from that of bulk α-Fe2O3. There existed an interaction between the Pt and Fe metals and the SiO2 support for the Pt−Fe/SiO2 catalyst. On the supported iron-containing catalysts, the Fe3+ species were highly dispersed on the SiO2 supported before reduction. No Fe0 and Fe2+ in octahedral vacancy were found in the reduction of SiO2 supported iron-containing catalysts. Addition of Pt to the Fe/SiO2 catalyst could promote the reduction of the iron species.
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