Exhaust gas purification catalyst

摘要

In an exhaust gas purification catalyst, particles (12) of a catalytic metal-doped, Ce-Zr-based second mixed oxide are carried on the surfaces of particles (11) of a Ce-Zr-based first mixed oxide. The second mixed oxide contains Ce and Zr as metals forming its constituents. Catalytic metal atoms (13) are placed at least one of at and between crystal lattice points of the second mixed oxide. The first mixed oxide contains Ce and Zr as metals forming its constituents but no catalytic metal. Thus, the concentration of catalytic metal on the surfaces of catalyst particles is increased.