PALLADIUM-RHODIUM BASED AUTOMOTIVE CATALYST CONTAINING RARE EARTH ELEMENT HAVING IMPROVED HEAT RESIS

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PURPOSE : Palladium-rhodium-based catalyst for vehicles is provided to improve reactivity and heat resistance characteristic by further adding lanthanum, neodymium, and yttrium as promoters. CONSTITUTION : Palladium-rhodium-based catalyst for vehicles includes a carrier(10), a first coating layer(20), and a second coating layer(30). The first coating layer is formed at the external surface of the carrier. The first coating layer contains palladium. The second coating layer is formed at the external surface of the first coating layer. The second coating layer contains rhodium. The first coating layer contains aluminum, strontium oxide, a promoter mixture, and palladium. The second coating layer contains aluminum, a promoter mixture, and rhodium. The promoter mixture contains cerium, zirconium, lanthanum, neodymium, and yttrium.