| 摘要 |
PROBLEM TO BE SOLVED: To prevent a trouble wherein a NOx purification performance is deteriorated due to a high temperature endurance test by a method wherein in the case where a catalyst for purifying an exhaust gas is manufactured, noble metals contain at least Pt and Pd, and Pt and Pd are simultaneously supported by using a mixed solution of a Pt compound solution and a Pd compound solution. SOLUTION: An exhaust gas purifying catalyst for purifying an exhaust gas exhausted from an internal combustion engine of an automobile or the like is composed of a base material, a coat layer comprising a porous support formed on the surface of the base material, and noble metals and a NOx absorbing material which are supported by the coat layer. In the case such the exhaust gas purifying catalyst manufactured, the noble metals should contain at least Pt and Pd, and Pt and Pd are treated so as to be simultaneously supported by using a mixed solution of a Pt compound solution and a Pd compound solution. Thereby, Pt and Pd can be supported in a condition wherein they are uniformly highly dispersed, the degree of lowering of a front surface area of the noble metals is decreased even after the temperature endurance test, and decrease of a purification performance can be suppressed. |
