Patent ID: 7867943

Claim:
A method for producing an exhaust gas purifying catalyst, the method comprising: producing a first powder in which platinum particles are carried on a compound oxide, wherein the compound oxide includes an oxide of cerium, an oxide of a metal for stabilizing the oxide of the cerium, and an oxide containing no cerium, by impregnating the compound oxide with an organic platinum aqueous solution to transfer electrons from the platinum particles in the organic platinum aqueous solution to the compound oxide to charge the compound oxide to a negative polarity and to charge the platinum particles to a positive polarity thereby causing an electron accepting point of the compound oxide to absorb the platinum particles selectively, and by sintering the compound oxide to which the platinum particles are absorbed; producing a second powder, in which rhodium particles are carried on an oxide, by impregnating the oxide with an aqueous solution of rhodium nitrate, and sintering the oxide to which the rhodium nitrate is absorbed; preparing a slurry by mixing together the first powder and the second powder; applying said slurry onto a substrate; and then drying and sintering the slurry to form a coating layer on the substrate; wherein the cerium content of the compound oxide is 30 mole percent or less with reference to a total mole number of metal atoms of the compound oxide.