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US 8,845,974 B2Granted
Advanced catalyzed soot filters and method of making and using the same
AssigneeBASF SE
InventorsYuejin Li, Stanley A. Roth, Alfred H. Punke, Gary A. Gramiccioni
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Abstract
Catalyzed soot filters comprising a wall flow monolith having porous walls, a first washcoat permeating the porous walls and a second washcoat on the porous walls are disclosed. Methods of manufacturing catalyzed soot filters and diesel engine exhaust emission treatment systems are also disclosed.
Claims15
A catalyzed soot filter comprising:
- a wall flow monolith having a plurality of longitudinally extending passages formed by longitudinally extending porous walls bounding and defining said passages, the passages comprising inlet passages having an open inlet end and closed outlet end, and outlet passages having a closed inlet end and an open outlet end;
- a first washcoat permeating the walls of the wall flow monolith;
- and
- a second washcoat disposed on the walls of the passages of the wall flow monolith, wherein the first washcoat comprises one of (1) platinum and palladium on refractory metal oxide support particles or (2) zeolite and alumina;
- and the second washcoat comprises the other of (1) platinum and palladium on refractory metal oxide support particles or (2) zeolite and alumina.
2 more elements
Dependencies are inferred from the claim text.