A study on the reduction behavior of silica supported iron and platinum-iron catalysts

Abstract

The reduction behavior of silica supported iron and platinum-iron catalysts were studied by combined in situ temperature programmed reduction (TPR)-Mtssbauer Spectroscopy 0VIBS). The results indicated that the TPR profiles of the supported Fe catalysts were different fi'om that ofbttlk cc-Fe203. 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 Fe 3+ species were highly dispersed on the SiO2 support before reduction. No Fe ~ and Fe 2+ 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.