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AssigneeJohnson Matthey Public Limited Company
InventorsJoanne Elizabeth Melville, Robert James Brisley, Orla Keane, Paul Richard Phillips, Elizabeth Hazel Mountstevens
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A method of reducing nitrogen oxides (NOx) 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° C.; (ii) thermally net desorbing NO from the NO adsorbent in a lean gas stream at 200° C. and above; and (iii) catalytically reducing NOx on 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.
A method of reducing nitrogen oxides (NOx) present in a lean gas stream comprising nitric oxide (NO), which method comprising the steps of:
A system for reducing nitrogen oxides (NOx) in a lean gas stream comprising nitric oxide (NO), the system comprising an adsorbent for adsorbing NO per se from the lean gas stream at below 200° C., means for contacting the NO adsorbent with a lean gas stream at 200° C. and above thereby to desorb NO from the NO adsorbent and means for reducing NO desorbed from the NO adsorbent comprising a NO reduction catalyst and a source of reductant selected from the group consisting of a hydrocarbon reductant, a nitrogenous reductant, hydrogen and mixtures of any two or more thereof, wherein the NO adsorbent comprises palladium and a cerium oxide.
Dependencies are inferred from the claim text.