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Development of New Three-Way Catalyst Technologies to Improve Purification Performance for Exhaust Emission after Severe Thermal Aging
Published May 23, 2012 by Society of Automotive Engineers of Japan in Japan
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-dimensional 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.