Johnson Matthey Public Limited Company

Thomas Hotchkiss

David Marvell

Andrew Francis Chiffey

Lucy Clowes

Sarah Warren

John Turner

Peter Bellham

Guy Richard Chandler

David Thompsett

Christopher Daly

Katharine Ann Hardstone

Thomas Campbell

Cecilia Bernadini

Sabina Burmester

Jonathon Paul Sapsford

Andrew Chiffey

Katharine Hardstone

Cecilia Bernardini

Methods for treating a filter for filtering particulate matter from exhaust gas are disclosed in which a dry powder is sprayed towards an inlet face of the filter entrained in a primary flow of gas to pass through the inlet face to contact a porous structure of the filter. The back pressure of the filter is monitored during spraying of the dry powder and the spraying of the dry powder is stopped when the back pressure of the filter reaches a required value. The required value may equal an absolute back pressure, or a pre-determined target back pressure for the filter minus an offset pressure, or an estimated back pressure of the filter.

Particulate filters

A method of coating a substrate with a foam is described. The method comprises:

Method of coating a substrate with a particle stabilized foam

A vehicular exhaust filter comprising a porous substrate having an inlet face and an outlet face with the porous substrate comprising inlet channels extending from the inlet face and outlet channels extending from the outlet face is disclosed. The inlet channels and the outlet channels are separated by a plurality of filter walls having a porous structure. The vehicular exhaust filter is loaded with a refractory powder having a tapped density before loading of less than 0.10 g/cmand the vehicular exhaust filter has a mass loading of the refractory powder of less than 10 g/l.

A vehicular exhaust filter () comprising a porous substrate having an inlet face and an outlet face with the porous substrate comprising inlet channels extending from the inlet face and outlet channels extending from the outlet face is disclosed. The inlet channels and the outlet channels are separated by a plurality of filter walls having a porous structure. The vehicular exhaust filter () is loaded with a refractory powder having a tapped density before loading of less than 0.10 g/cmand the vehicular exhaust filter has a mass loading of the refractory powder of less than 10 g/l.

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Royston, United Kingdom

Thomas Hotchkiss