Patent ID: 7977275

Claim:
Catalytically coated particulate filter having a first end face and a second end face and an axial length L, characterized in that the particulate filter is coated with a first and a second catalyst, wherein the first catalyst is coated over a fraction of axial length L starting from the first end face and contains platinum and palladium on first support materials, and the second catalyst contains platinum or platinum and palladium on second support materials, wherein the weight ratio of palladium to platinum in the first catalyst is between 10:1 and 1:50, and the weight ratio of palladium to platinum in the second catalyst is lower than the corresponding weight ratio in the first catalyst, wherein the particulate filter is a wall-flow filter made from ceramic material, such as silicon carbide, cordierite, aluminium titanate or mullite which has an open-pore structure with a porosity of between 30 and 95% and mean pore diameters of between 10 and 50 μm.