Novel ultra stable zeolite y and method for manufacturing...

B - Operations – Transporting – 01 – J

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B01J 29/08 (2006.01) B01J 37/08 (2006.01)

Patent

CA 2747624

This invention comprises USY zeolite prepared by treating a USY zeolite un-der hydrothermal conditions after forming the USY zeolite from heat treating ammonium ex-changed zeolite Y, e g, by calcination. When this invention is used in a FCC catalyst, a sig-nificant improvement of activity and selectivity in the fluid catalytic cracking (FCC) perfor-mance is observed, compared to FCC catalysts containing conventional USY zeolite. The pro-cess used to make the invention is efficient and comprises treating the USY zeolite in an ex-change bath under the aforementioned hy-drothermal conditions. The surface of the re-sulting USY zeolite has a molar ratio of alumi-na to silica that is higher than that seen in the bulk USY zeolite and has a unique structure as viewed by SEM and TEM.

L'invention concerne une zéolithe USY préparée en traitant une zéolithe USY dans des conditions hydrothermales après la formation de la zéolithe USY par traitement thermique d'une zéolithe Y à ammonium échangé, p. ex. par calcination. Lorsque la zéolithe selon l'invention est utilisée dans un catalyseur FCC, une amélioration significative de l'activité et de la sélectivité pour les performances de craquage catalytique fluide (FCC) est observée en comparaison des catalyseurs de FCC contenant une zéolithe USY classique. Le procédé utilisé pour fabriquer la zéolithe selon l'invention est efficace et comprend le traitement de la zéolithe USY dans un bain d'échange dans les conditions hydrothermales susmentionnées. La surface de la zéolithe USY résultante a un rapport molaire entre l'alumine et la silice qui est supérieur à celui observé dans le volume de la zéolithe USY et a une structure unique telle qu'observée par MEB et MET.

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