Method for producing zeolites

Details Method for producing zeolites Method for producing zeolites

1977-10-13

1979-11-20

Meros, Edward J.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

260448C, 423328, C01B 3328

Patent

active

041751140

ABSTRACT:
As synthesized by previous methods, ZSM-5 or ZSM-11 zeolites are crystallized in the presence of substantial amounts of a nitrogen-containing compound. When synthesized in this way, they contain an organic ammonium cation as well as a metal cation such as sodium. To obtain a more active form, the sodium ion must be exchanged out. Such exchange, especially with ZSM-5 and ZSM-11, is difficult unless there is calcination of the zeolite to remove the obstructing organo compounds. By making these zeolites in the presence of (1) seeds of the desired zeolite, (2) mixtures of them with ammonium hydroxide and/or alcohol, (3) the alcohol per se or (4) mixtures of the alcohol with ammonium hydroxide, a product substantially deficient in organic ammonium cation is obtained. These products can be exchanged directly without any calcination.

REFERENCES:
patent: 3119659 (1964-01-01), Taggart et al.
patent: 3321272 (1967-05-01), Kerr
patent: 3516786 (1970-06-01), Maher et al.
patent: 3532459 (1970-10-01), McEvoy et al.
patent: 3671191 (1972-06-01), Maher et al.
patent: 3702886 (1972-11-01), Argauer et al.
patent: 3709979 (1973-01-01), Chu
Zhdanov, "Molecular Sieve Zeolites-I", ACS, 1971, pp. 36 & 37.

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