Silicon substituted zeolite compositions and process for prepari

Details Silicon substituted zeolite compositions and process for prepari Silicon substituted zeolite compositions and process for prepari

1985-02-07

1986-09-09

Doll, John

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

502 60, 502 78, 502 79, C01B 3328

Patent

active

046108564

ABSTRACT:
Aluminum from AlO.sub.4 -tetrahedra of as-synthesized zeolites is extracted and substituted with silicon to form zeolite compositions having higher SiO.sub.2 /Al.sub.2 O.sub.3 molar ratios and exhibiting distinctive chemical and physical properties. The preparative procedure involves contact of the starting zeolite with an aqueous solution of a fluorosilicate salt using controlled proportions and temperature and pH conditions which avoid aluminum extraction without silicon substitution.

REFERENCES:
patent: 3506400 (1970-04-01), Eberly et al.
patent: 3551353 (1970-12-01), Chen et al.
patent: 3597155 (1971-08-01), Flanigen
patent: 3849340 (1974-11-01), Pollitzer
patent: 3933983 (1976-01-01), Elliott
patent: 4273753 (1981-06-01), Chang

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