Ferrierite compositions for reducing nox emissions during...

C - Chemistry – Metallurgy – 10 – G

Patent

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

Patent

CA 2544918

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 ferricrite zeolite particles. Preferably, the NOx reduction composition contains ferrierite zeolite particles bound with an inorganic binder. In the alternative, the ferrierite zeolite particles are incorporated into the cracking catalyst as an integral component of the catalyst. NOx reduction 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.

Cette invention concerne des compositions visant à réduire les NO¿x? générés lors d'un procédé de craquage catalytique, de préférence lors d'un procédé de craquage catalytique fluide. Ces compositions comprennent une composition catalytique de craquage catalytique fluide, contenant de préférence une zéolite de type Y, ainsi qu'une composition de réduction de NO¿x? particulaire contenant des particules de zéolite de ferriérite. La composition de réduction de NO¿x? contient de préférence des particules de zéolite de ferriérite liées à un liant inorganique. Dans une variante, les particules de zéolite de ferriérite sont incorporées dans le catalyseur de craquage en tant que composant intégrant du catalyseur. Les compositions de réduction de NO¿x? de cette invention permettent de réduire très efficacement les émissions de NO¿x? libérées du régénérateur d'une unité de craquage catalytique fluide fonctionnant dans des conditions de procédé de craquage catalytique fluide sans entraîner de variation substantielle de la conversion ou du rendement de produits craqués. Cette invention concerne également des procédés d'utilisation des compositions de cette invention.

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