Exhaust gas purifying catalyst

摘要

The present invention provides an exhaust gas purifying catalyst that can keep high catalytic performance even being subjected to exhaust gas. The exhaust gas purifying catalyst includes: noble metal particles (7); and supports (3), each support supporting the noble metal particles (7), wherein at least a certain amount of the noble metal particles (7) is provided on an outermost surface of the support (3), or provided within a range of 10% inside of a diameter of the support (3) from the outermost surface in a direction toward a center of the support.

主权项

1. An exhaust gas purifying catalyst, comprising:
noble metal particles; supports, each support supporting the noble metal particles, and each support being formed of either a primary particle or a secondary particle formed of a plurality of primary particles; and Al2O3 particles arranged together to provide a structure having pores, wherein the noble metal particles are provided within a range of 10% inside of a diameter of the support from an outermost surface in a direction toward a center of the support, the noble metal particles and one or more of the supports supporting the noble metal particles form a unit, each unit is provided in the pores of the structure, and the units are covered by the Al2O3 particles, and an average diameter of the units is larger than an average diameter of the pores of the structure so that the units are mutually isolated and aggregation is prevented.