| abstract |
To improve the performance of an exhaust gas purification catalyst and enhance the particulate matter burning rate of a catalyst-equipped diesel particulate filter, the catalyst contains a mixed oxide of Zr, at least one kind of rare earth metal other than Ce and precious metal. The rare earth metal is selected from the group of Y, Yb, Nd and Sc. The mixed oxide is obtained by mixing an acidic solution containing Zr ions, ions of at least one kind of rare earth metal other than Ce and precious metal ions with a basic solution to obtain a mixed oxide precursor through coprecipitation and calcining the precursor. |