W. R. Grace Co.-conn.

Jianxin Wu

Robert R Gatte

Terry G Roberie

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

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).

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Elkridge, MD, United States of America

Jianxin Wu