CATALYST CARRIER PRODUCTION METHOD, COMPOSITE CATALYST PRODUCTION METHOD, COMPOSITE CATALYST, FUEL CELL USING SAME

The present invention is intended to reduce the amount of use of platinum or the like and to improve corrosion resistance. Objects of the invention are to provide a catalyst carrier production process that can reduce the amount of a catalyst metal used in an electrode catalyst while maintaining high performance by enhancing the activity of the supported catalyst metal, thereby achieving electrode catalyst cost reduction, a catalyst that can have high performance despite a low catalyst metal content, and a process for producing the catalyst. The catalyst carrier production process according to the invention includes a step (a) of mixing a transition metal compound (1), a nitrogen-containing organic compound (2), and a solvent to provide a catalyst carrier precursor solution; a step (b) of removing the solvent from the catalyst carrier precursor solution; and a step (c) of thermally treating a solid residue obtained in the step (b) at a temperature of 500 to 1100°C to provide a catalyst carrier; wherein the transition metal compound (1) is partly or wholly a compound including a transition metal element (M1) selected from the group 4 and 5 elements of the periodic table as a transition metal element; and at least one of the transition metal compound (1) and the nitrogen-containing organic compound (2) includes an oxygen atom.