Development of New Three-way Catalyst Technologies to Improve Purification Performance for Exhaust Emission after Severe Thermal Aging

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  • 熱劣化を抑制するための三元触媒技術の開発
  • ネツ レッカ オ ヨクセイ スル タメ ノ サンゲン ショクバイ ギジュツ ノ カイハツ

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It should be common sense to be concerned for reducing amount of platinum group metals, usage in three-way catalyst over keeping its performance due to tough atmosphere for catalytic reactions. From recent study of thermal deterioration in both palladium catalyst and rhodium one, following were found: 1) PdO should be key to avoid Pd sintering and uniformly dispersed barium on alumina is effective to maintain PdO phase. 2) To disperse Pd particle in 3-dimentional nano-structure by porous alumina has also big impact on inhibition of Pd sintering. 3) The encapsulated structure of cerium-zirconium-Rh by lanthanum-alumina leads to suppress Rh sintering.

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