Binary zeolitic systems, their synthesis and their utilization

Details Binary zeolitic systems, their synthesis and their utilization Binary zeolitic systems, their synthesis and their utilization

1987-06-19

1989-07-11

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

423328, B01J 2906

Patent

active

048472247

ABSTRACT:
The present invention concerns binary zeolitic systems comprising two zeolites A and B having different crystalline structures while having common structural units. The crystals of the zeolite A form a central core surrounded by a crown of crystals of zeolite B, the zeolites A and B being disposed concentrically and following the same longitudinal axis. These systems are formed by the introduction of a nucleation gel containing seeds of the zeolite A in a growth gel where the crystallization parameters are favorable to the crystallization of the zeolite B. The binary zeolitic systems are useful as catalysts for transforming hydrocarbons and more especially as cracking catalysts.

REFERENCES:
patent: 3366578 (1968-01-01), Michalko
patent: 3773690 (1973-11-01), Heinze et al.
patent: 4406823 (1983-09-01), Laurent et al.

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