In-situ crystallized zeolite containing composition (LAI-ISC)

Details In-situ crystallized zeolite containing composition (LAI-ISC) In-situ crystallized zeolite containing composition (LAI-ISC)

1997-07-29

1999-04-20

Bos, Steven

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

In form of a membrane

502 64, 585407, 585820, 208310Z, 208135, 95116, 95127, 95130, 95136, 95138, 95143, 95147, B01J 2028

Patent

active

058957693

ABSTRACT:
Applicant has discovered a new zeolite containing composition and a process for preparing the same. The composition is unique in that the zeolite crystals making up one layer of the composition pack in a manner such that the composition is essentially continuous with no large scale voids even when the zeolite layer is <10 .mu.m thick. Thus, the present invention is directed toward a composition comprised of a porous substrate and a layer of zeolite crystals wherein said layer of zeolite crystals is a polycrystalline layer with at least 99% of said zeolite crystals having at least one point between adjacent crystals that is .ltoreq.20 .ANG. and wherein at least 90% of said crystals have widths of from about 0.2 to about 100 microns (preferably about 2 to about 50 microns) and wherein at least 75% of said crystals have a thickness of within 20% of the average crystal thickness. Preferably the composition has at most 1 Volume % voids in the zeolite layer. Use of the composition is also described.

REFERENCES:
patent: 5019263 (1991-05-01), Haag et al.
patent: 5100596 (1992-03-01), Haag et al.
patent: 5258339 (1993-11-01), Ma et al.
patent: 5429743 (1995-07-01), Geus et al.

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