Compositions and processes for reducing nox emissions during...

B - Operations – Transporting – 01 – J

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B01J 29/80 (2006.01) C10G 11/18 (2006.01)

Patent

CA 2563499

Compositions for reduction of NOX generated during a catalytic cracking process, preferably, a fluid catalytic cracking process, are disclosed. The compositions comprise a fluid catalytic cracking catalyst composition; preferably containing a Y-type zeolite, and a particulate NOX reduction composition containing particles of a zeolite having a pore size ranging from about 3 to about 7.2 Angstoms and a SiO2 to Al2O3 molar ratio of less than about 500. Preferably, the NOX reduction composition contains NOX reduction zeolite particles bound with an inorganic binder, In the alternative, the NOX reduction zeolite particles are incorporated into the cracking catalyst as an integral component of the catalyst. Compositions in accordance with the invention are very effective for the reduction of NOX emissions released from the regenerator of a fluid catalytic cracking unit operating under FCC process conditions without a substantial change in conversion or yield of cracked products. Processes for the use of the compositions are also disclosed.

La présente invention a trait à des compositions pour la réduction de NO¿x? généré lors d'un traitement de craquage catalytique, de préférence, un traitement de craquage catalytique fluide. Les compositions comportent une composition de catalyseur de craquage catalytique fluide ; contenant de préférence une zéolithe de type Y, et une composition particulaire de réduction de NO¿x? contenant des particules d'une zéolithe ayant une dimension de pores comprise entre environ 3 et environ 7,2 .ANG. et un rapport molaire SiO¿2?/Al¿2?O¿3? inférieur à environ 500. De préférence, la composition de réduction de NO¿x? contient des particules de zéolithe de réduction de NO¿x? liées par un liant inorganique. En variante, les particules de zéolithe de réduction de NO¿x ?sont incorporées dans le catalyseur de craquage sous la forme d'un constituant intégral du catalyseur. Des compositions selon l'invention sont très efficaces pour la réduction d'émissions de NO¿x? libérées depuis le régénérateur de l'unité de craquage fluide fonctionnant dans des conditions de traitement de craquage catalytique fluide sans modification sensible dans la conversion ou dans le rendement de produits craqués. L'invention a également trait à des procédés pour l'utilisation des compositions.

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