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US 5,013,699 AGranted
Novel zeolite compositions derived from zeolite Y
AssigneeUop LLC
InventorsJames G. Vassilakis, Donald F. Best
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Abstract
Novel catalyst bases are described which are prepared by hydrothermally treating an ammonium ion exchanged sodium Y zeolite followed by low pH ammonium ion exchange to produce highly crystalline zeolite catalyst base. Catalysts incorporating such novel zeolite catalyst bases, as well as hydrocracking and fluid catalytic cracking processes for the production of gasoline products utilizing catalysts incorporating such novel catalyst bases, are also described.
Claims6
A zeolite composition prepared by the process comprising the steps of:
- (a) providing a crystalline sodium zeolite Y starting composition and contacting said starting composition with ammonium cations under cation exchange conditions to reduce the Na.sub.2 O content of the starting composition to less than 3.0 weight percent;
- (b) hydrothermally steaming the ammonium exchanged zeolite Y of step (a) at a temperature of from 550.degree. C. to about 850.degree. C. to reduce the unit cell dimension of the crystal lattice;
- (c) contacting the steamed product of step (b) with a sufficient amount of an aqueous solution of ammonium ions having a pH of less than about 4.0 and for a sufficient time to exchange at least some of the residual sodium cations and to increase the bulk Si/Al.sub.2 ratio of the composition to the range of 6.5 to 20;
- and
- (d) recovering the ion-exchanged and extracted product of step (c).
2 more elements
Dependencies are inferred from the claim text.