Importance

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Abstract

A catalytic wall-flow filter for exhaust gas from a gasoline engine is disclosed. The catalytic wall-flow filter comprises porous walls and having a first face and a second face defining a longitudinal direction therebetween and first and second pluralities of channels extending in the longitudinal direction. The first plurality of channels is open at the first face and closed at the second face, and the second plurality of channels is open at the second face and closed at the first face. The filter comprises a first coating in the first plurality of channels which is free of platinum group metal, and a second coating in the second channels which comprises palladium, platinum, an oxygen storage capacity material, and an inorganic support.

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First Claim