Johnson Matthey Public Limited Company

Caitlin Lucy Jenkins

Paul Richard Phillips

Neil Greenham

Matthew Eben Harris

Alexander Green

Daniel Avis

Alanna Susan Murphy

Andrew Francis Chiffey

Francois Moreau

Alexander Nicholas Michael Green

Gavin Michael Brown

Kieran John Cole

David Micallef

Robert Hanley

James Alexander Wylie

Christopher Daly

Lee Alexander Gilbert

Oliver Cooper

George Platt

Oliver Hemming

Per Marsh

Rafal Baran

Carmelo Iacono

Jonas Edvardsson

Kieran Cole

A method of treating exhaust gas from a lean burn internal combustion engine is disclosed. The method comprises: introducing ammonia or an ammonia precursor into the exhaust gas upstream of an Fe-SCR catalyst, the Fe-SCR catalyst comprising iron and a zeolite; and contacting the exhaust gas with the Fe-SCR catalyst; wherein the amount of ammonia or ammonia precursor introduced into the exhaust gas upstream of the Fe-SCR catalyst is controlled to provide an ammonia-to-NOmolar ratio (ANR) in the exhaust gas contacting the Fe-SCR catalyst of from greater than 2 to 6.

Method of treating exhaust gas and system for same

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

A catalytic composition for treating a NOx-containing exhaust gas, wherein the composition comprises a copper-substituted zeolite comprising: i) Ce in a total amount of about 0.1 to about 200 g/ft; and ii) Mn in a total amount of about 0.1 to about 200 g/ft.

Catalytic composition for treating a NOx-containing exhaust gas

Growing community of inventors

Royston, United Kingdom

Caitlin Lucy Jenkins