Catalyst and method for reduction of nitrogen oxides

C - Chemistry – Metallurgy – 01 – B

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C01B 21/00 (2006.01) B01J 8/00 (2006.01) B01J 21/00 (2006.01) B01J 29/06 (2006.01)

Patent

CA 2575338

A Selective Catalytic Reduction (SCR) catalyst was prepared by slurry coating ZSM-5 zeolite onto a cordierite monolith, then subliming an iron salt onto the zeolite, calcining the monolith, and then dipping the monolith either into an aqueous solution of manganese nitrate and cerium nitrate and then calcining, or by similar treatment with separate solutions of manganese nitrate and cerium nitrate. The supported catalyst containing iron, manganese, and cerium showed (80) percent conversion at (113) degrees Celsius of a feed gas containing nitrogen oxides having (4) parts NO to one part NO2, about one equivalent ammonia, and excess oxygen; conversion improved to (94) percent at (147) degrees Celsius. N2O was not detected (detection limit: 0.6 percent N2O).

La présente invention a trait à un catalyseur de réduction catalytique sélective préparé par le revêtement par suspension épaisse à base de zéolithe ZSM-5 sur un bloc de cordiérite, la calcination du bloc, et l'immersion du bloc soit dans une solution aqueuse de nitrate de manganèse ou de nitrate de cérium suivie d'une calcination, ou un traitement analogue avec des solutions séparées de nitrate de manganèse et de nitrate de cérium. Le catalyseur supporté contenant du fer, du manganèse, et du cérium a présenté une conversion de 80 % à 113 degrés Celsius d'un gaz d'alimentation contenant des oxydes d'azote ayant 4 parties d'oxyde d'azote pour une partie de dioxyde d'azote, environ un équivalent d'ammoniac, et un excédent d'oxygène; la conversion s'est améliorée à 94 % à 147 degrés Celsius. Aucun oxyde nitreux n'a été détecté (limite de détection: 0,6 % d'oxyde nitreux).

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