Johnson Matthey Public Limited Company

Garry Adam Burgess

Paul Richard Phillips

Guy Richard Chandler

Alexander Nicholas Michael Green

Matthew Eben Harris

David Marvell

Keith Anthony Flanagan

James Alexander Wylie

Miroslaw Gall

A catalytic wall-flow monolith filter for use in an emission treatment system comprises a wall flow monolith comprising a porous substrate having surfaces that define the channels and having a first zone extending in the longitudinal direction from a first end face towards a second end face for a distance less than the filter length and a second zone extending in the longitudinal direction from the second end face towards the first end face and extending in the longitudinal direction for a distance less than the filter length, wherein a first SCR catalyst is distributed throughout the first zone of the porous substrate, an ammonia oxidation catalyst is distributed throughout the second zone of the porous substrate and a second SCR catalyst is located in a layer that covers the surfaces in the second zone of the porous substrate.

Catalytic wall-flow filter with an ammonia slip catalyst

A catalyst article comprises an SCR catalyst and a NOx adsorber catalyst, where each of these catalysts comprise a metal molecular sieve, each with a different metal. The catalyst article can be close coupled with other components to give a NOperformance advantage from cold start to a combined DOC and SCRF system. Higher NOconversion is also shown in under-floor location due to NOx storage before SCR light off and selective NHslip control, allowing higher NH3 fill levels. Systems comprising the catalyst article and methods of using the catalyst article to give improved hydrocarbon and carbon monoxide control, as well as ammonia slip control, are described. The systems can include flow-through or wall-flow monoliths.

Combining SCR with PNA for low temperature emission control

Growing community of inventors

Royston, United Kingdom

Garry Adam Burgess