Patent ID: 6692712
Filing Date: 2004-02-17
Classification: B01D,B01J,Y02A,Y02T

Abstract:
A three way catalyst composition comprising rhodium on a first support which is free from platinum and palladium, said first support comprising:(a) 52-88% zirconia, and (bâ€²) 10-40% ceria, and (bâ€³) 2-8% lanthanum oxide based on the total weight of (a), (bâ€²) and (bâ€³), the concentration of the rhodium on the first support being 0.035-0.35% based on the total weight of the rhodium and the first support, the catalyst containing 1.2-4.0 g per in3 in total of (a), (bâ€²) and (bâ€³) and wherein (a), (bâ€²) and (bâ€³) constitute 90-100% by weight of the first support.