NOVELTY - Process for oxidizing carbon monoxide with free oxygen to carbon dioxide, comprises contacting a feed stream comprising carbon monoxide, hydrogen and oxygen with a composition (I) obtained by incorporating a hydrocarbon into the pores of an alumina-containing compound followed by spraying a substance comprising platinum and iron into or onto the alumina-containing compound, contacting obtained sprayed support with a sulfide, calcining obtained sulfided support, contacting obtained calcined support with steam, and reducing obtained steamed support    USE - The process is useful for oxidizing carbon monoxide with free oxygen to carbon dioxide. (I) is useful for removing carbon monoxide, preferably all carbon monoxide, from a stream containing carbon monoxide and hydrogen, particularly, to provide hydrogen feedstock for fuel cells.    ADVANTAGE - The process provides an efficient and selective oxidation of carbon monoxide to carbon dioxide in gaseous mixture containing hydrogen and carbon monoxide.    DETAILED DESCRIPTION - Process for oxidizing carbon monoxide with free oxygen to carbon dioxide, comprises contacting a feed stream comprising carbon monoxide, hydrogen, and oxygen with a composition (I) in a contacting zone under contacting conditions for a period of time so as to produce a product stream containing less carbon monoxide than the feed stream, where the composition is prepared by a method comprising: incorporating a hydrocarbon into the pores of an alumina-containing compound such that at least half of the pore volume of the alumina-containing compound contains the hydrocarbon; spraying a substance comprising platinum and iron into or onto the alumina-containing compound to form a sprayed support; contacting the sprayed support with a sulfide, which is hydrogen sulfide or alkyl-sulfide, to form a sulfided support; calcining the sulfided support to form a calcined support; contacting the calcined support with steam to form steamed support; and reducing the steamed support to form the composition.