An exhaust gas purifying catalyst comprises a powder including a porous material
having a specific surface area of 150 m2/g or more, cerium and platinum.
Cerium and Platinum are loaded on the porous material. The powder has platinum
dispersion of 70% or more before baking and platinum dispersion of 50% or more
after baking in air at 700 C. Additionally, a reduction rate R of the platinum
dispersion after the baking against the platinum dispersion before the baking is
below 40%. The reduction rate R is represented by a following equation (1):
