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Johnson Matthey Public Limited Company

David Repp

Paul Joseph Andersen

Maria Theresia Brandmair

Silvia Alcove Clave

Michael Nash

Manop Huber

Kevin Doura

Thomas Yeh

Cindy Khalaf

A method of extending the useful life of an aged selective catalytic reduction (SCR) catalyst bed, which catalyses the conversion of oxides of nitrogen (NO) to dinitrogen (N) in the presence of a nitrogenous reductant, in the exhaust gas after treatment system of a stationary source of NOso that the exhaust gas emitted to atmosphere from the system continues to meet proscribed limits for both NOand 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 kNOof 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&#xb0; C. inclusive, wherein kNOx of a sample of the catalyst, which has been aged at 450&#xb0; C. in 10% HO (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 NH, 15% O, 8% water, 3% CO, balance N.

Method of extending the useful life of an aged SCR catalyst bed in an exhaust system of a stationary source of NOX

A catalyst for treating an exhaust gas comprising SO, NOand elemental mercury in the presence of a nitrogenous reductant comprises a composition containing oxides of: (i) Molybdenum (Mo) and optionally Tungsten (W); and (ii) Vanadium (V); and (iii) Titanium (Ti); and (iv) Phosphorus (P), wherein, with respect to the total metal atoms in the composition, the composition comprises: (i) Mo in an amount of less than 2 at. %, and optionally up to 9 at. % W; (ii) from 2.5 to 12 at. % V; (iii) from 85 to 96 at. % Ti, and wherein the composition comprises (iv) P in an atomic ratio to the sum of atoms of Mo, W and V of from 1:2 to 3:2. The values expressed must total 100%.

Catalyst for treating an exhaust gas, an exhaust system and a method

A catalyst for treating an exhaust gas comprising SO, NOand elemental mercury in the presence of a nitrogenous reductant comprises a composition containing oxides of: (i) Molybdenum (Mo) and/or Tungsten (W); (ii) Vanadium (V); (iii) Titanium (Ti), and (iv) an MFI zeolite, wherein the composition comprises, based on the total weight of the composition: (i) 1 to 6 wt % of MoOand/or 1 to 10 wt % WO; and (ii) 0.1 to 3 wt % VO, and (iii) 48.5 to 94.5 wt % TiO; and (iv) 35 to 50 wt % MFI zeolite.

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Royston, United Kingdom

David Repp