Supported La_1--xCe_xMnO₃ perovskite catalysts: preparation, characterization and catalytic performance in methane combustion

Abstract

A serials of La_1--xCe_xMnO₃ (x = 0, 0.2, 0.4, 0.6 and 0.8) catalysts have been prepared via a sol--gel process using citric acid as a chelating agent. The phase composition and morphology of the catalysts are characterized by XRD, SEM and TEM. La_1--xCe_xMnO₃/γ-Al₂O₃/cordierite catalyst has also been prepared by immersion process using cordierite honeycomb ceramic as carrier and γ-Al₂O₃ as support agents. The effect of Ce-doping on the structure of perovskite and catalytic property of methane combustion is explored. The results show that with the increase of Ce substitution, the crystal structure of perovskite changes from the tetragonal system to the orthorhombic system and when the x is equal to 0.2, the catalytic property in methane combustion is the best.

Keywords

perovskite / preparation / sol--gel / methane combustion