Johnson Matthey Public Limited Company

James Alexander Wylie

Paul Richard Phillips

Stuart David Reid

Guy Richard Chandler

Alexander Nicholas Michael Green

Daniel Swallow

Hai-Ying Chen

Joseph Michael Fedeyko

Andrew Francis Chiffey

Philip Gerald Blakeman

Erich Conlan Weigert

Julian Peter Cox

Todd Howard Ballinger

Francois Moreau

David Bergeal

Neil Greenham

Kieran John Cole

Matthew Eben Harris

David Micallef

Robert Hanley

Christopher Daly

Lee Alexander Gilbert

Alexander Green

Oliver Cooper

Wolfgang Strehlau

George Platt

Caitlin Lucy Jenkins

Per Marsh

Garry Adam Burgess

Miroslaw Gall

Marie Feuerstein

Jonas Edvardsson

Kieran Cole

Julian P Cox

Erich C Weigert

A composite, zone-coated, dual-use ammonia (AMOX) and nitric oxide oxidation catalyst () comprises: a substrate () having a total length L and a longitudinal axis and having a substrate surface extending axially between a first substrate end (I) and a second substrate end (O); two or more catalyst washcoat zones () comprised of a first catalyst washcoat layer () comprising a refractory metal oxide support material and one or more platinum group metal components supported thereon and a second catalyst washcoat layer () different from the first catalyst washcoat layer () and comprising a refractory metal oxide support material and one or more platinum group metal components supported thereon, which two or more catalyst washcoat zones () being arranged axially in series on and along the substrate surface, wherein a first catalyst washcoat zone () having a length L, wherein L<L, is defined at one end by the first substrate end (I) and at a second end () by a first end () of a second catalyst washcoat zone () having a length L, wherein L<L, wherein the first catalyst washcoat zone () comprises a first refractory metal oxide support material and one or more platinum group metal components supported thereon; and the second catalyst washcoat zone comprises a second refractory metal oxide support material and one or more platinum group metal components supported thereon; and a washcoat overlayer (G) extending axially from the first substrate end for up to 200% of the axial length of the underlying first catalyst washcoat layer, which washcoat overlayer comprising a particulate metal oxide loading of >48.8 g/l (>0.8 g/in), wherein the particulate metal oxide is an aluminosilicate zeolite including at least one of copper, iron and manganese, wherein a total platinum group metal loading in the first catalyst washcoat zone () defined in grams of platinum group metal per litre of substrate volume (g/l) is different from the total platinum group metal loading in the second catalyst washcoat zone ().

Composite, zone-coated, dual-use ammonia (AMOX) and nitric oxide oxidation catalyst

An exhaust system for treating an exhaust gas from an internal combustion engine is disclosed. The system comprises a modified lean NOtrap (LNT), a urea injection system, and an ammonia-selective catalytic reduction catalyst. The modified LNT comprises a first layer and a second layer. The first layer comprises a NOadsorbent component and one or more platinum group metals. The second layer comprises a diesel oxidation catalyst zone and an NO oxidation zone. The diesel oxidation catalyst zone comprises a platinum group metal, a zeolite, and optionally an alkaline earth metal. The NO oxidation zone comprises a platinum group metal and a carrier. The modified LNT stores NOat temperatures below about 200&#xb0; C. and releases at temperatures above about 200&#xb0; C. The modified LNT and a method of using the modified LNT are also disclosed.

Exhaust system with a modified lean NOx trap

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

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An apparatus is disclosed. The apparatus comprises a lean-burn internal combustion engine, engine management means and an exhaust system for treating exhaust gas of the engine. The exhaust system comprises a first oxidation catalyst disposed on a first honeycomb monolith substrate. The first oxidation catalyst comprises platinum supported on a first metal oxide support comprising at least one reducible oxide, and is substantially free of alkali metals and alkaline earth metals. The engine management means is arranged, when in use, intermittently to modulate the lambda composition of the exhaust gas entering the first oxidation catalyst to a rich lambda composition.

Oxidation catalyst for a lean burn internal combustion engine

A catalyst composition is provided having a zeolite material of a CHA crystal structure and a silica to alumina mole ratio (SAR) of about 10 to about 25 and preferably having a mean crystal size of at least 1.0 microns; and a non-aluminum base metal (M), wherein said zeolite material contains said base metal in a base metal to aluminum ratio (M:Al) of about 0.10 to about 0.24.

Zeolite catalyst containing metal

Provided is a catalyst comprising (a) a zeolite material having a mean crystal size of at least about 0.5 &#x3bc;m, having a CHA framework that contains silicon and aluminum, and having a silica-to-alumina mole ratio (SAR) of about 10 to about 25; and (b) an extra-framework promoter metal (M) disposed in said zeolite material as free and/or exchanged metal, wherein the extra-framework promoter metal is copper, iron, and mixtures thereof, and is present in a promoter metal-to-aluminum atomic ratio (M:Al) of about 0.10 to about 0.24 based on the framework aluminum; and optionally comprising (c) at least about 1 weight percent of cerium in said zeolite material, based on the total weight of the zeolite, wherein said cerium is present in a form selected from exchanged cerium ions, monomeric ceria, oligomeric ceria, and combinations thereof, provided that said oligomeric ceria has a particle size of less than 5 &#x3bc;m.

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Royston, United Kingdom

James Alexander Wylie