Combustion Suppression in Tri-reforming of Methane over Ni Supported Catalysts at Low Temperatures in Electric Field

Abstract

Tri-reforming of methane (a mixed reaction with steam reforming, dry reforming, and partial oxidation of methane) for syngas production is investigated over Ni supported catalysts in an electric field at low temperature of 473 K. The main objective is to gain enthalpy from exhaust gases of automobiles using an exhaust gas recirculation (EGR) system, so high methane conversion and low combustion (oxidation) are anticipated. Ni(ac)/Mg/La_0.1Zr_0.9O₂ catalyst showed high methane conversion with methane combustion suppressed even at 473 K in an electric field. The role of co-supported Mg on Ni/La_0.1Zr_0.9O₂ catalyst was investigated by several characterizations. Mg-addition stabilized the Ni–oxide on Ni(ac)/Mg/La_0.1Zr_0.9O₂ catalyst even in the reaction atmosphere by virtue of the formation of an adjacent structure of Ni and Mg, and it contributed to methane combustion suppression.