PALLADIUM BASED AUTOMOTIVE CATALYST OPTIMIZED PARTICLE SIZE OF NOBLE METAL

摘要

PURPOSE: A palladium catalyst with the optimized particle sizes of noble metals is provided to improve the initial purifying efficiency of the catalyst after deterioration by optimizing interaction between aluminum oxide and noble metals. CONSTITUTION: A palladium catalyst includes a carrier(10), a first coating layer(20), and a second coating layer(30). The first coating layer is formed at the outer surface of the carrier. The first coating layer includes barium oxide and palladium. The second coating layer is formed at the outer surface of the first coating layer. The second coating layer includes barium oxide and palladium. The thickness of the first coating layer is between 100 and 110 g/L. The thickness of the second coating layer is between 130 and 140 g/L.