Johnson Matthey Public Limited Company

Elizabeth Hazel Mountstevens

Paul Richard Phillips

Daniel Swallow

Robert James Brisley

Ralf Dotzel

Rainer Leppelt

Paul James Millington

Jörg Werner Münch

Hubert Schedel

Joanne Elizabeth Melville

Fiona-Mairead McKenna

Kenneth David Camm

Noelia Cortes Felix

Orla Keane

A NOabsorber catalyst comprising a substrate monolith coated with one or more washcoat layers and comprising a first component comprising a nitrogen oxide storage component, at least one precious metal and a dispersed rare earth oxide supported on a refractory support material, and a second component comprising a precious metal supported on a bulk reducible oxide that is substantially free of nitrogen oxide storage material, wherein the precious metal present in the second component comprises Pt, Pd or a combination of both Pt and Pd and wherein the bulk reducible oxide is an oxide, a composite oxide or a mixed oxide comprising at least one of manganese, iron, cobalt, copper, tin or cerium.

[object Object]

A NOabsorber catalyst comprising an extruded solid body comprises either:

A method of reducing nitrogen oxides (NO) present in a lean gas stream comprising nitric oxide (NO) comprises the steps of: (i) net adsorbing NO per se from the lean gas stream in an adsorbent comprising palladium and a cerium oxide at below 200&#xb0; C.; (ii) thermally net desorbing NO from the NO adsorbent in a lean gas stream at 200&#xb0; C. and above; and (iii) catalytically reducing NOon a catalyst other than the NO adsorbent with a reductant selected from the group consisting of a hydrocarbon reductant, a nitrogenous reductant, hydrogen and a mixture of any two or more thereof. A system for carrying out such a method is also disclosed.

Thermally regenerable nitric oxide adsorbent

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Royston, United Kingdom

Elizabeth Hazel Mountstevens