Johnson Matthey Public Limited Company

Daimler Ag

Other

Johnson Matthey Inc.

Hjs Emission Technology Gmbh & Co. Kg

Hjs Fahrzeugtechnik Gmbh & Co. Kg

Hjs Emission Technology Gmbh & Co. Ltd.

Hjs Fahrezeutechnik Gmbh & Co. Kg

Hjs Emission Technology Gmbh & Co. Kb

Claus Friedrich Goersmann

Guy Richard Chandler

Anders Klas Andreasson

James Patrick Warren

Georg Huethwohl

Paul Richard Phillips

Philip Gerald Blakeman

Raj Rao Rajaram

Martyn Vincent Twigg

Andrew Peter Walker

Georg Hüthwohl

Mats Lavenius

Eive Tord Ronny Allansson

Valerie Anne Self

A system for NOreduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO, particulate filter, a source of reductant such as NHand an SCR catalyst and methods for operating such a system are disclosed. Considerable improvements in NOconversion and soot reduction are observed even at relatively low operating temperatures.

[object Object]

A system for NOreduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO, particulate filter, a source of reductant such as NHand an SCR catalyst. Considerable improvements in NOconversion are observed.

An exhaust system for a lean burn internal combustion engine comprises a particulate filter (CSF), a first NOabsorbent (NO(1)) disposed upstream of the filter and a second NOabsorbent (NO(2)) disposed downstream of the filter.

A system for NOreduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO, tparticulate filter, a source of reductant such as NHand an SCR catalyst. Considerable improvements in NOconversion are observed.

A system for NOreduction in combustion gases, especially from diesel engines, incorporates an oxidation catalyst to convert at least a portion of NO to NO, a particulate filter, a source of reductant such as NHand an SCR catalyst. Considerable improvements in NOconversion are observed.

An exhaust system for a lean burn internal combustion engine includes a particulate filter (CSF), a first NOabsorbent (NO()) disposed upstream of the filter and a second NOabsorbent (NO()) disposed downstream of the filter.

An exhaust system for a vehicular lean-burn internal combustion engine includes a NOreduction catalyst, a source reductant, means () for contacting the catalyst with the reductant, means for sensing the temperature of the exhaust gas and/or the catalyst bed and means, when in use, for controlling reductant addition. The reductant addition control means supplies an amount of reductant to the catalyst at a rate corresponding to a measured temperature value of the exhaust gas and/or catalyst bed, which temperature value has been pre-determined to correlate, in use, with an amount of NOin the exhaust gas.

Methods of controlling reductant addition

Selective catalytic reduction of NO in combustion gases, especially from diesel engines, utilizes a system incorporating an oxidation catalyst to convert at least a portion of NO to NO , a particulate filter downstream of the oxidation catalyst, a source of reductant such as NH or urea for injection downstream of the particulate filter, and an SCR catalyst located downstream of the point of injection of the reductant. Considerable improvements in NO conversion are observed.

System for NOx reduction in exhaust gases

In the reduction of quantities of No in the exhaust gases of lean bum engines such as diesel engines, using a selective reduction catalyst and a source of ammonia, the present invention improves overall conversion by supplying ammonia or a precursor intermittently so that it is adsorbed and desorbed during the engine operating cycle.

Growing community of inventors

Cambridge, United Kingdom

Claus Friedrich Goersmann