To provide a catalyst composition expressing the excellent catalyst activity of Cu under a high temperature or a redox fluctuation, further for use in a long period of time while the amount of a noble metal used is reduced.
A catalyst composition containing a spinel structure composite oxide expressed by formula (1) is prepared. Since Cu is contained as a spinel structure composite oxide of a specified composition, flocculation of Cu fine particles can be controlled under a high temperature or a redox fluctuation, further for use in a long period of time, and the high catalytic activity of Cu can maintained. Since the high catalytic activity can be maintained without using an noble metal, the costs can be reduced. The formula is expressed by (1) (M
Mari Nishinishi
Taniguchi Shoji
Ginger Tenryu
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