STEAM REFORMING CATALYST, STEAM REFORMING PROCESS USING SAME, AND STEAM REFORMING REACTOR

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A steam reforming catalyst for reforming a fuel that is formed from hydrocarbons by means of steam is provided with : a composite oxide carrier which contains alumina, ceria, zirconia and a rare earth oxide other than ceria; and at least one first metal element that is supported by the composite oxide carrier and is selected from the group consisting of platinum group metals. The aluminum composition in the surface of the composite oxide carrier is 1.5 times or more the aluminum composition of the whole composite oxide carrier.