W. R. Grace Co.-conn.

Robert R Gatte

Jianxin Wu

Terry G Roberie

James George Miller

David Monroe Chapman

A synthetic zeolite, designated zeolite GZS-11, is made having a molar composition expressed by the formula:

Zeolite GZS-11 and its dynamic preparation process

Catalytic cracking utilizing a catalyst comprising zeolite GZS-11

When a zeolite additive composition of a medium-pore zeolite with a Constraint Index from about 1 to about 12 and a silica to alumina mole ratio greater than about 12 is added to a conventional cracking catalyst dispersed in an inorganic matrix, the octane will be improved, but there will be a yield loss in the amount of gasoline produced. An improvement in that catalyst system is obtained by partially exchanging the medium-pore zeolite additive with cations from one or more elements of Group IA, Group IIA or Group IIIA excluding rare earths of the Periodic Table. The octane number of the gasoline-range product of an FCC process is still improved while the amount of the gasoline yield loss typically observed for such octane-enhancing additives is reduced.

Zeolite octane additive-cracking process

Zeolite L is made from an aqueous precursor mixture that contains from 0.1 to about 10% by weight of an amorphous aluminosilicate seeding gel which does not contain zeolite L. Using this mixture zeolite L can be made in a much shorter time than with a synthesis mixture without the seeding gel, and with substantially no zeolite T impurity. When made at temperatures below about 120.degree. C the zeolite. L has a disk-shaped morphology which is substantially free of zeolite T (offretite type).

Zeolite L synthesis and resulting product

When a zeolite additive composition of a medium-pore zeolite with a Constraint Index from about 1 to about 12 and a silica to alumina mole ratio greater than about 12 is added to a conventional cracking catalyst dispersed in an inorganic matrix, the octane will be improved, but there will be a yield loss in the amount of gasoline produced. An improvement in that catalyst system is obtained by partially exchanging the medium-pore zeolite additive with cations from one or more elements of Group IA, Group IIA or Group IIIA of the Periodic Table. The octane number of the gasoline-range product of an FCC process is still improved while the amount of the gasoline yield loss typically observed for such octane-enhancing additives is reduced.

Zeolite octane additive

Hydrocarbon conversion catalyst compositions which are highly selective for producing gasoline-range olefins, aromatics and, hence, a high octane gasoline, by making a combination catalyst of two different zeolites. The combination of a stabilized zeolite Omega component and a zeolite Y component produces a catalyst which is highly selective for the production of gasoline-range olefins and aromatics. The two components can be added separately to an FCC process or they can be matrixed together.

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Columbia, MD, United States of America

Robert R Gatte