CATALYST COMPONENT

PROBLEM TO BE SOLVED: To provide, for the purpose of solving, in light of the desirability of an oxide film having a nano-sized three-dimensional structure as the supporter of a catalyst carrier supporting a metal catalyst, the problem that, although a three-dimensionally structured oxide film of aluminum can be realized either by a porous film provided by anodic oxidation or by a feathery film provided by boiling, composite effects cannot be realized in a case where both are composited due to the clogging, by the feathery hydroxide formed as a result of boiling, of the porous oxide film obtained as a result of anodic oxidation, a catalyst component capable of increasing the number of pores by adjusting pore intervals to the extent that the feathery structure does not clog pores and of improving the catalyst reaction efficiency based on an enlarged surface area of the porous oxide film.SOLUTION: As a catalyst component having a catalyst function on a metal surface, a catalyst component wherein the metal is aluminum having a porous oxide film and a feathery structure on the surface wherein pore intervals of the porous oxide film range from 300 nm to 1200 nm is used.