Oxygen storage material

摘要

An excellent oxygen storage capacity is achieved even in the case used for a long period of time under high temperature conditions. An oxygen storage material contains a first particle made of a composite oxide of cerium and zirconium or a composite oxide of cerium, a rare-earth element other than cerium and zirconium, a second particle including a composite oxide of a rare-earth element, an alkaline-earth element and zirconium, and a precious metal. A part of the precious metal forms a solid solution with the composite oxide included in the second particle.

主权项

1. An oxygen storage material comprising:
a first particle made of a first composite oxide consisting essentially of oxygen, cerium and zirconium or a second composite oxide consisting essentially of oxygen, cerium, a first rare-earth element other than cerium and zirconium; a second particle including a third composite oxide of a second rare-earth element, an alkaline-earth element and zirconium, the second particle further including a support supporting the third composite oxide and containing an oxide of the second rare-earth element as a main component; and a precious metal, a part of the precious metal forming a solid solution with the third composite oxide included in the second particle, wherein the weight ratio of the first particle with respect to the second particle is within a range of 80/20 to 40/60.