Fe2O3,-SiO2 which removes H2S and COS from hot coal gas, was prepared. The characteristics of reduction are studied using simulated coal gas that was synthesized by an air blow n gasifier. Fe2O3-SiO2 was only reduced to oxides in which the oxygen atomic ratio to iron (R-O/Fe) was 1.0-1.3 at 1%-5% steam concentrations in the temperature range of 623 K-723 K. It is estimated that oxides were mixtures of Fe3O4, Fe1-xO, and iron silicate. This evaluation indicates that an amorphous SiO2 prevented the formation of Fe, Fe3C and carbon. The formation of Fe2SiO4 starts at 773 K, and Fe is converted completely into Fe2SiO4 above 823 K. Such formation of Fe2SiO4 causes large decrease in specific surface area. This result indicates that sintering of Fe2O3-SiO2 is caused by the formation of Fe2SiO4 above 773 K. It is suggested that Fe2O3-SiO2 should be used as a desulfurization material below 773 K.