Iodine-Sulfur thermochemical process is one promising method for hydrogen production by thermochemically splitting water at high temperature. It has been focused as a carbon-free hydrogen production process to overcome the global warming problem and positively expected for industrialization. Various metallic catalysts supported on Al2O3 or TiO2 were prepared in various metal contents, and the catalytic activity and thermal durability of each catalyst were compared at the temperature range of 750°-950°C in a fixed bed reactor. Concentrated analyses with Fe catalysts were performed since Fe on Al2O3 or TiO2 showed interestingly high performance and thermal resistance. This is an abstract of a paper presented at the AIChE Annual Meeting and Fall Showcase (Cincinnati, OH 10/30/2005-11/4/2005).