Exhaust gas purification catalyst

摘要

A catalyst layer includes: a first mixed oxide particle component 4 which contains Ce and Rh 8 and in which Rh is partially exposed at particle surfaces; and a second mixed oxide particle component 5 containing Ce, Zr, and a rare earth metal except Ce. The particle size distribution of the first mixed oxide particle component 4 has a peak in the particle size range from 100 nm to 300 nm, both inclusive. The particle size distribution of the second mixed oxide particle component 5 has a peak in a particle size range larger than the particle size range in which the first mixed oxide particle component 4 has the peak. At least part of particles of the first mixed oxide particle component 4 is attached to at least part of particles of the second mixed oxide particle component 5.

主权项

1. An exhaust gas purification catalyst, comprising a support and a catalyst layer provided on the support, wherein
the catalyst layer includes a plurality of types of mixed oxide particle components containing Ce, the plurality of types of mixed oxide particle components include a first mixed oxide particle component containing Ce and a catalytic metal which is partially exposed at particle surfaces, and a second mixed oxide particle component containing Ce, Zr, and a rare earth metal except Ce, a particle size distribution of the first mixed oxide particle component has a peak in the particle size range from 100 nm to 300 nm, both inclusive, a particle size distribution of the second mixed oxide particle component has a peak in a particle size range higher than the particle size range in which the first mixed oxide particle component has the peak, and at least part of particles of the first mixed oxide particle component is attached to at least part of particles of the second mixed oxide particle component.