CORE SHELL CARRIER AND PRODUCTION METHOD THEREFOR, EXHAUST EMISSION CONTROL CATALYST USING THE CORE SHELL CARRIER AND PRODUCTION METHOD THEREFOR, AND EXHAUST EMISSION CONTROL METHOD USING THE EXHAUST EMISSION CONTROL CATALYST

摘要

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:(ReCe)ZrO(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