Abstract
Iron oxide catalysts supported on MgO, Al 2O 3, SiO 2 and ZrO 2 were prepared by an impregnation method. They were characterized by BET surface analysis, X-ray diffraction (XRD), temperature-programmed reduction (TPR) and Mössbauer spectroscopy. Fe/MgO catalyst shows the highest H 2S removal capacity in wet oxidation at room temperature. Both the XRD and the TPR analyses of the catalysts indicate that H 2S removal capacity correlates with the dispersion of iron oxide on supports. Mössbauer spectroscopy shows that four kinds of Fe 3+ species are present in the supported iron oxide catalysts: two highly dispersed species, Fe 3+ oxide clusters, and α-Fe 2O 3 particles. Two highly dispersed species, Fe 3+ cation and MgFe 2O 4, are present in Fe/MgO. Fe 3+ oxide clusters and α-Fe 2O 3 crystals are evident in both Fe/SiO 2 and Fe/ZrO 2. α-Fe 2O 3 crystals are only observed in Fe/Al 2O 3.
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