Process for preparing silicon substituted zeolite compositions

Details Process for preparing silicon substituted zeolite compositions Process for preparing silicon substituted zeolite compositions

Filed on

1989-12-22

Date issued

1991-02-26

Examiner

Straub, Gary P.

Patent Class

Chemistry of inorganic compounds

SubClass

Silicon or compound thereof

SubSubClass

Oxygen containing

Other Related Categories

423118, 502 85, 502 86, C01B 3328

Type

Patent

Status

active

Patent number

049960342

Description

ABSTRACT:
In the process for inserting extraneous silicon atoms into lattice sites of zeolite crystals from which aluminum atoms have been extracted, it has been found that the use of more concentrated fluorosilicate salt solutions and shorter contact times between the zeolite crystals and the salt solution than heretofore proposed, enables the production of more highly siliceous products with less defect structure. Advantageously the zeolite crystals are contacted with the concentrated fluorosilicate salt solution in a stepwise manner with the crystals being washed to remove fluoride ions between each contact with the salt solution.

REFERENCES:
patent: 4503023 (1985-03-01), Breck et al.
patent: 4597956 (1986-07-01), Hinchey et al.
patent: 4610856 (1986-09-01), Skeels et al.
patent: 4753910 (1988-06-01), Han et al.
patent: 4840779 (1989-06-01), Cannan

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