Johnson Matthey Public Limited Company

Keimoy St Hill

Stuart David Reid

David Marvell

Mark Walton

Thilanka Wijemanne

James Googan

Francesco Foschi

Anton Macminn

A catalytic wall-flow monolith filter for use in an emission treatment system is disclosed. The filter comprises porous walls, 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 provides a first plurality of inner surfaces and is open at the first face and closed at the second face; and the second plurality of channels provides a second plurality of inner surfaces and is open at the second face and closed at the first face. The filter comprises a first selective catalytic reduction (SCR) catalyst coated on the first plurality of inner surfaces of the porous walls to form a first SCR catalyst porous layer, a second SCR catalyst within the porous walls, and a third SCR catalyst coated on the second plurality of inner surfaces of the porous walls to form a third SCR catalyst porous layer.

Catalytic wall-flow filter

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Royston, United Kingdom

Keimoy St Hill