Johnson Matthey Public Limited Company

Sabina Burmester

David Marvell

Thomas Hotchkiss

Jonathon Paul Sapsford

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.

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Royston, United Kingdom

Sabina Burmester