CORE SHELL TYPE OXYGEN ABSORPTION AND EMISSION MATERIAL, MANUFACTURING METHOD THEREFOR, EXHAUST GAS PURIFICATION CATALYST USING THE SAME, AND EXHAUST GAS PURIFICATION METHOD

摘要

To provide an oxygen absorption and emission material capable of providing an exhaust gas purification catalyst having excellent oxygen absorption and emission performance even when exposed to a high temperature, and achieving excellent NOx purification performance.SOLUTION: A core shell type oxygen absorption and emission material having a core consisting of a ceria-zirconia-based solid-solution powder having a regular phase of at least one of a pyrochlore phase and a κ phase, and a shell arranged on at least a part of a surface of the core and consisting of alumina-based oxide containing α alumina, in which an intensity ratio between a diffraction line of 2θ=14.5° and a diffraction line of 2θ=29° calculated by an X ray diffraction pattern obtained by an X ray diffraction measurement using CuKα after heating in air at 1100°C for 5 hr. [I(14/29) value] is 2% or more, and an intensity ratio between a diffraction line of 2θ=35.2° and a diffraction line of 2θ=29° [I(35/29) value] is 0.03 to 1.2%.SELECTED DRAWING: Figure 1