Fcc catalyst comprising coated zeolite particles

B - Operations – Transporting – 01 – J

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Details

B01J 29/06 (2006.01) B01J 29/08 (2006.01) B01J 33/00 (2006.01) B01J 37/02 (2006.01) C10G 11/05 (2006.01)

Patent

CA 2191585

The invention relates to an FCC catalyst comprising zeolite particles at least 50 % of the outer surface of which is coated with a layer of pre-formed inorganic oxide, which layer has a thickness in the range of 10 nm to 5 µm, generally in the range of 10 nm to 2 µm, in which the ratio between the particle size of the oxide and the mean particle size of the zeolite particles is in the range of 0,001:1 to 0,5:1. The particles may be coated by contacting uncoated zeolite particles having a mean particle size in the range of 0.1 to 10 µm with an aqueous medium containing particles of the oxide to be provided having a particle size in the range of 10 to 5000 nm, preferably in the range of 10 nm to 1000 nm, after which the particles are optionally dried or calcined. The oxide is preferably alumina. The FCC catalysts according to the invention comprising zeolite particles coated with inorganic oxide are less rapidly deactivated by contaminant metals present in heavy feeds than FCC catalyst comprising uncoated zeolite particles. Further, the coated zeolite particles are less susceptible to blocking of the zeolite pores by coke than uncoated zeolite particles.

L'invention concerne un catalyseur FCC (de craquage catalytique fluide) comprenant des particules de zéolite dont au moins 50 % de la surface extérieure est recouverte d'une couche d'oxyde inorganique préformé, cette couche possédant une épaisseur se situant entre 10 nm et 5 mu m, généralement entre 10 nm et 2 mu m; le rapport entre la dimension de particule de l'oxyde et la grosseur de particule moyenne des particules de zéolite est de l'ordre de 0,001:1 à 0,5:1. Les particules peuvent être recouvertes par mise en contact de particules de zéolite non recouvertes, possédant une grosseur moyenne de particule comprise entre 0,1 et 10 mu m, avec un milieu aqueux contenant des particules de l'oxyde à utiliser, celles-ci possédant une grosseur de particule comprise entre 10 et 5000 nm, de préférence entre 10 et 1000 nm; ensuite, les particules recouvertes sont éventuellement séchées ou calcinées. De préférence, l'oxyde est de l'oxyde d'aluminium. Les catalyseurs FCC selon l'invention comprenant des particules de zéolite recouvertes d'oxyde inorganique sont moins rapidement désactivés par les métaux contaminants, présents dans des charges d'alimentation lourdes, que les catalyseurs FCC comprenant des particules de zéolite non recouvertes. En outre, les particules de zéolite recouvertes sont moins sujettes au blocage des pores de zéolite par le coke que les particules de zéolite non recouvertes.

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