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    METHOD OF EXTENDING THE USEFUL LIFE OF AN AGED SCR CATALYST BED IN AN EXHAUST SYSTEM OF A STATIONARY SOURCE OF NOX
    4.
    发明申请
    METHOD OF EXTENDING THE USEFUL LIFE OF AN AGED SCR CATALYST BED IN AN EXHAUST SYSTEM OF A STATIONARY SOURCE OF NOX 审中-公开

    公开(公告)号：US20190383174A1

    公开(公告)日：2019-12-19

    申请号：US16465600

    申请日：2017-11-29

    申请人： Johnson Matthey Public Limited Company

    发明人： Paul ANDERSEN ,  Kevin DOURA ,  Cindy KHALAF ,  David REPP ,  Thomas YEH

    IPC分类号： F01D25/30 ,  F01N13/00 ,  F01N3/10 ,  F01N3/20

    摘要： A method of extending the useful life of an aged selective catalytic reduction (SCR) catalyst bed, which catalyses the conversion of oxides of nitrogen (NOx) to dinitrogen (N2) in the presence of a nitrogenous reductant, in the exhaust gas after treatment system of a stationary source of NOx so that the exhaust gas emitted to atmosphere from the system continues to meet proscribed limits for both NOx and ammonia emissions, which method comprising the step of retrofitting an additional honeycomb substrate monolith or a plate-type substrate comprising a catalyst (ASC) for converting ammonia in exhaust gas also containing oxygen to nitrogen and water downstream of the aged SCR catalyst bed, wherein the kNOx of the honeycomb substrate monolith comprising the catalyst for converting ammonia in exhaust gas also containing oxygen to nitrogen and water is greater than or equal to 80 m/hr between 300 and 400° C. inclusive, wherein kNOx of a sample of the catalyst, which has been aged at 450° C. in 10% H2O (as steam) in air for 48 hours, is determined by a SCR activity test in a laboratory scale reactor using a gas composition of 50 ppm CO, 30 ppm NO, 36 ppm NH3, 15% O2, 8% water, 3% CO2, balance N2.

    Method and Composition
    5.
    发明申请
    Method and Composition 有权

    公开(公告)号：US20220219145A1

    公开(公告)日：2022-07-14

    申请号：US17647358

    申请日：2022-01-07

    申请人： Johnson Matthey Public Limited Company

    发明人： Kevin DOURA

    IPC分类号： B01J23/42 ,  B01J21/12 ,  B01J21/06 ,  B01J37/03 ,  B01J37/04 ,  B01J37/08 ,  B01J35/04 ,  B01J37/02 ,  B01J35/10 ,  B01D53/94 ,  F01N3/28

    摘要： The present invention relates to a method of preparing a catalyst article comprising steps: (a) preparing a washcoat composition by combining at least the following components: a support material comprising a mixed oxide, a mixture of oxides or a molecular sieve comprising (i) alumina and (ii) silica and/or zirconia; a metal oxide sol comprising at least one of titania, silica or zirconia; a liquid medium; (b) applying the washcoat composition to a substrate to form a washcoating; and (c) drying and/or calcining the washcoating; wherein the method further comprises a step of impregnating the support material with a platinum group metal component. The prepared catalyst article may be suitable for the treatment of emissions from an internal combustion engine or a gas turbine, for example, the treatment of carbon monoxide and/or formaldehyde emissions from a natural gas fueled internal combustion engine or gas turbine.