Patent ID: 6645439
Filing Date: 2003-11-11
Classification: B01D,B01J,Y02T

Abstract:
An exhaust gas clean-up catalyst structure comprising a two-layer composite having:(a) a first exhaust gas clean-up catalyst in one layer of said two-layer composite, said first exhaust gas clean-up catalyst comprising a first particulate support material consisting essentially of ceria and zirconia, at least one noble metal selected from the group consisting of platinum (Pt), palladium (Pd), rhodium (Rh), ruthenium (Ru), and osmium (Os), and tungsten oxide supported by said first particulate support material and complexed with the zirconia; and (b) a second exhaust gas clean-up catalyst in the other layer of said two-layer composite for oxidizing carbon monoxide and unsaturated hydrocarbons, wherein said second catalyst comprises a second particulate support material.