Particle filter for exhaust gas of gasoline engines
AssigneeUmicore AG & Co. KG
InventorsMeike Antonia Gotthardt, Jan Schoenhaber, Naina Deibel, Gabriela Kucerova
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Abstract
The present invention is directed to a wall-flow filter which is used in particular in exhaust gas systems of vehicles driven by gasoline engines. The filter has three-way activity and filters fine particles, which result from the combustion of gasoline, from the exhaust gas stream. The invention also relates to a method for producing a corresponding filter and to the preferred use thereof.
Claims11
A wall-flow filter for reducing particle emissions in the exhaust gas of gasoline engines having the length L, wherein the wall-flow filter comprises channels E and A that extend in parallel between a first and a second end of the wall-flow filter and are separated by porous walls forming surfaces OE and OA, respectively, and wherein the channels E are closed at the second end and the channels A are closed at the first end,
- wherein said wall-flow filter has two catalytically active coatings applied to the surfaces OE and OA in separate coating steps, wherein a first coating extends from the first end of the wall-flow filter over 55 to 96% of the length L and a second coating extends from the first end of the wall-flow filter over 10 to 40% of the length L and wherein a third coating extends from the second end of the wall-flow filter over 55 to 96% of the length L and a fourth coating extends from the second end of the wall-flow filter over 10 to 40% of the length L.
Dependencies are inferred from the claim text.