ZSM-5 zeolites having uniformly large crystals

Details ZSM-5 zeolites having uniformly large crystals ZSM-5 zeolites having uniformly large crystals

1987-03-03

1990-03-13

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

502 64, 502 71, B01J 2928

Patent

active

049083422

ABSTRACT:
There is provided an improvement for making large crystallite ZSM-5 zeolites by a method comprising forming the zeolite in a medium containing a combination of tetramethylammonium and tetrapropylammonium cations. The improvement involves the addition of sodium chloride to the aqueous reaction medium to increase the uniformity of crystallite size and to increase the mean crystallite size. Also provided are catalysts comprising these ZSM-5 crystallites and processes for converting organic compounds with these catalysts.

REFERENCES:
patent: 3790471 (1974-02-01), Argauer et al.
patent: 3849463 (1974-11-01), Dwyer et al.
patent: 3941871 (1976-03-01), Dwyer et al.
patent: 3976598 (1976-08-01), Daviditz
patent: 4100215 (1978-07-01), Chen
patent: 4182923 (1980-01-01), Chu
patent: 4375458 (1983-03-01), Dwyer et al.
Ryszard Mostowicz et al., "Morphological Study of ZSM-5 grown in the 12Na.sub.2 014.5(TPA).sub.2 O System", Zeolites, vol. 3, No. 3, Jul. 1983, pp. 219-225.
M. Ghamami and L. B. Sand, "Synthesis and Crystal Growth of Zeolite [NH.sub.4, TPA]-ZSM-5", Zeolites 1983, vol. 3, pp. 155-162, Apr.

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