Method for converting carbon dioxide by methane

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PROBLEM TO BE SOLVED : To efficiently obtain carbon monoxide and hydrogen from gas containing methane and carbon dioxide by using a catalyst obtained by carrying a rare earth metal oxide, an alkaline earth metal oxide, nickel and a very small amount of rhodium on a support and firing them. SOLUTION : A rare earth metal oxide, an alkaline earth metal oxide, nickel and rhodium are carried on a support such as alumina in a rhodium to nickel molar ratio of 0.005-0.4, a rare earth metal oxide to nickel molar ratio of 0.01-1 and an alkaline earth metal to nickel molar ratio of 0.3-20 and in a total amount of 5-30 mass%. They are then fired at 1, 000-1, 100 deg.C. Gas containing carbon dioxide and methane is brought into contact with the resulting catalyst to produce carbon monoxide and hydrogen. At this time, reaction temperature is preferably in the range from 300-400 deg.C to 1, 000-900 deg.C.