Marked difference of catalytic behavior by preparation methods in CH4 reforming with CO2 over Mo2C and WC catalysts

Dependence of the activity and durability upon the preparation methods was investigated in the reforming of CH4 with CO2 over molybdenum and tungsten carbide catalysts. It was found that deactivation of Mo2C was suppressed even at ambient pressure over catalysts prepared through nitridation of molybdenum oxides before carburization. On the contrary, in the case of WC the catalysts prepared through nitridation exhibited much lower durability against the oxidation of carbide during CH4-CO2 reaction than those prepared by direct carburization.