Process for preparing low silica forms of zeolites having the fa

Details Process for preparing low silica forms of zeolites having the fa Process for preparing low silica forms of zeolites having the fa

1993-12-23

1994-11-22

Bell, Mark L.

Chemistry of inorganic compounds

Zeolite

Isomorphic metal substitution

423DIG21, C01B 3334

Patent

active

053667204

ABSTRACT:
Low silica forms of faujasite-type zeolites are prepared from more siliceous forms of the same zeolite species by contacting the starting zeolite with a highly caustic concentrated sodium aluminate solution at elevated temperatures. In view of the fact that the process does not favor the formation of undesirable impurity phases such as zeolite A and thus does not require the presence of zeolite A nucleation inhibitors, the process is particularly advantageous in the production of forms of zeolite X having Si/Al.sub.2 molar ratios below 2.5.

REFERENCES:
patent: 3130007 (1964-04-01), Breck
patent: 3607043 (1971-09-01), McDaniel et al.
patent: 4333859 (1982-06-01), Vaughan et al.
patent: 4550092 (1985-10-01), Chang et al.
patent: 4576805 (1986-03-01), Chang et al.
patent: 4603040 (1986-07-01), Kuznicki et al.
patent: 5118482 (1992-06-01), Narayana et al.
patent: 5238676 (1993-08-01), Roth et al.

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