| abstract |
A core-shell carrier comprising: a core comprising at least one oxygen storage / release material selected from the group consisting of ceria-zirconia-based solid solutions and alumina-doped ceria-zirconia-based solid solutions; and a shell comprising a rare earth zirconia-based composite oxide represented by a composition formula: (Re 1-x Ce x ) 2 Zr 2 O 7 + X (where Re is a rare earth element and x is a) Number from 0.0 to 0.8), and with which an outside of the core is coated, wherein the rare earth zirconia composite oxide contains crystal particles having a pyrochlore structure, and the rare earth zirconia-based composite oxide has a mean crystal diameter of 3 to 9 nm. |