CORE-SHELL SUPPORT, METHOD FOR PRODUCING THE SAME, CATALYST FOR PURIFICATION OF EXHAUST GAS USING THE CORE-SHELL SUPPORT, METHOD FOR PRODUCING THE SAME, AND METHOD FOR PURIFICATION OF EXHAUST GAS USING THE CATALYST FOR PURIFICATION OF EXHAUST GAS
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United States of America Patent
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Mar 1, 2016
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Mar 12, 2015
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Abstract
A core-shell support, comprising:
- a core which comprises 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; anda shell which comprises a rare earth-zirconia based composite oxide represented by a composition formula: (Re1-xCex)2Zr2O7+x (where Re represents a rare earth element, and x represents a number of 0.0 to 0.8) and with which an outside of the core is coated,the rare earth-zirconia based composite oxide comprising crystal particles having a pyrochlore structure, andthe rare earth-zirconia based composite oxide having an average crystallite diameter of 3 to 9 nm.
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