Reaction of Methane with Carbon Dioxide by the LnFeO₃ (Ln=La, Pr, Nd, Sm, Gd) Catalysts

Abstract

The reactions of methane with carbon dioxide were carried out at 1073 K over the perovskite-type catalysts, LnFeO₃ (Ln = La, Pr, Nd, Sm, Gd). The order of the reaction activities was La>Pr>Nd>Sm>Gd.
From the results of XPS measurement the decline to the ionic character of the Fe-O bond led to the decrease of the activity.
The catalyst h aving the character that is rich in acidic or basic property, especially in the former case, exhibited the low selectivity to hydrogen. The NdFeO₃ catalyst, which has the same amount of both acidity and basicity gave the highest selectivity to hydrogen.