| 简介 |
PROBLEM TO BE SOLVED : To provide a core shell carrier capable of exerting sufficiently excellent oxygen absorption/release performance (OSC) and efficiently excellent NOx removal activity and a production method therefor, an exhaust emission control catalyst using the core shell carrier and a production method therefor, and an exhaust emission control method using the exhaust emission control catalyst.
SOLUTION : There is provided the core shell carrier which comprises : a core composed of at least one kind of oxygen absorption/release material selected from a group consisting of a ceria-zirconia-based solid solution and an alumina added ceria-zirconia-based solid solution; and a shell which is composed of a rare earth-zirconia-based compound oxide represented by a composition formula : (Re1-xCex)2Zr2O7+x (in the formula, Re represents a rare earth element and x represents the number of 0.0 to 0.8) and which covers an outside of the core, the rare earth-zirconia compound oxide containing a crystal particle having a pyrochlore structure, and average crystallite diameter of the rare earth-zirconia compound oxide being 3 to 9 nm.
SELECTED DRAWING : None
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