Marked difference of catalytic behavior by preparation methods in CH_4 reforming with CO_2 over Mo_2C and WC catalysts

摘要

Dependence of the activity and durability upon the preparation methods was investigated in the reforming of CH_4 with CO_2 over molybdenum and tungsten carbide catalysts. It was found that deactivation of Mo_2C 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 CH_4-CO_2 reaction than those prepared by direct carburization.