Exhaust gas purifying catalyst and method for producing same

摘要

An exhaust gas purifying catalyst, which is obtained by having at least one platinum group metal selected from the group consisting of Pt, Rh, and Pd supported on a calcined aluminum phosphate body. The calcined aluminum phosphate body has a tridymite crystal structure and the ratio of the cumulative pore distribution of pores having a size of 10 nm or less to the cumulative pore distribution of pores having a size of 300 nm or less is 20% or more in the calcined aluminum phosphate body. A method for producing an exhaust gas purifying catalyst including calcining aluminum phosphate, which has been obtained from an aqueous solution that is controlled to have a pH within a predetermined range, at a predetermined temperature for a predetermined period of time, thereby obtaining a calcined aluminum phosphate body; and having at least one platinum group metal selected from the group consisting of Pt, Rh, and Pd supported on the calcined aluminum phosphate body.

主权项

1. An exhaust gas purification catalyst having a platinum-group metal which is Pd supported on a fired aluminum phosphate body,
wherein the fired aluminum phosphate body has a tridymite-type crystal structure, and the cumulative pore distribution of pores of sizes 10 nm and smaller with respect to the cumulative pore distribution of pores of sizes 300 nm and smaller in the fired aluminum phosphate body is at least 20%.