Application of perovskite-type oxide to the support of steam reforming catalysts

Abstract

Ni/LaAlO₃ and Ni/SrTiO₃ showed high catalytic activities and longer-term stabilities than Ni/a-Al₂O₃. We examined the redox properties and the reaction mechanism. TPR measurements revealed that the lattice oxygen in perovskites was released by hydrogen reduction and recovered by H₂O during steam reforming reaction. We found that most of all the recovered lattice oxygen was highly reactive and could be utilized for the oxidation of CH₄. The lattice oxygen in perovskite is considered to play a positive role in both promoting the oxidation of CHx fragments adsorbed on metallic Ni and in hindering the production of inactive carbon species.