Crystalline zeolites and method of preparation from amorphous si

Details Crystalline zeolites and method of preparation from amorphous si Crystalline zeolites and method of preparation from amorphous si

1992-12-30

1994-01-04

Pal, Asok

Chemistry of inorganic compounds

Zeolite

Aging to induce zeolite formation from inorganic mixture

4233282, 4233291, 4233301, 423718, C01B 3334

Patent

active

052758001

ABSTRACT:
Zeolite is synthesized by reacting amorphous silica particles with NaOH and Al.sub.2 O.sub.3 under hydrothermal reaction conditions. The amorphous silica particles are preferably produced by reaction of fluosilicic acid and alumina to form aluminum fluoride and silica. The silica particles contain some residual fluorine and aluminum, and their surface area is about 1 to 3 m.sup.2 /g. Mordenite and ZSM-5 zeolites are obtained in preferred embodiments of the invention.

REFERENCES:
patent: 3436174 (1969-04-01), Sand
patent: 3574539 (1971-04-01), Domine et al.
patent: 3702886 (1972-11-01), Argauer et al.
patent: 3867512 (1975-02-01), Young
patent: 3920798 (1975-11-01), Weber
patent: 4081514 (1978-03-01), Sand et al.
patent: 4557918 (1985-12-01), Lagerstrom et al.

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