A catalyst for removing CO in the hydrogen-containing gas and a hydrogen-containing gas using this m

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PROBLEM TO BE SOLVED : To efficiently and selectively convert and remove CO in hydrogen- contg. gas in a relatively high temp. range and to effectively reduce the concn. of CO by carrying ruthenium and an alkali metallic compd. and/or an alkaline earth metallic compd. on a fireproof inorg. oxide carrier. SOLUTION : Ruthenium and an alkali metallic compd. and/or an alkaline earth metallic compd. are carried on a fireproof inorg. oxide, carrier to obtain the objective catalyst suitable for use in production of hydrogen-contg. gas for a fuel cell. At least one selected from among titania, alumina, etc. is used as the oxide carrier. At least one selected from among K, Cs, etc. is used as the alkali metal and at least one selected from among Ba, Ca, etc. is used as the alkaline earth metal. When this catalyst is used, CO in hydrogen-contg. gas can be efficiently and selectively converted and removed in a relatively high temp. range of >=100 deg.C.