Preparation of X zeolite

摘要

A method is disclosed for preparing crystalline aluminosilicate X zeolite from a reaction mixture containing only sufficient water to produce X zeolite. In one embodiment, the reaction mixture is self-supporting and may be shaped if desired. In the method, the reaction mixture is heated at crystallization conditions and in the absence of an added external liquid phase, so that excess liquid need not be removed from the crystallized product prior to drying the crystals.

主权项

1. A method for preparing crystalline X zeolite from a reaction mixture, said method comprising:
(a) preparing a self-supporting reaction mixture comprising at least one active, non-zeolitic source of silica, at least one active, non-zeolitic source of alumina, and a source of hydroxide in amounts sufficient to produce X zeolite, and sufficient water to produce X zeolite; (b) aging the mixture at a temperature from about 25° C. to about 60° C. for at least 24 hours to form crystals of X zeolite nuclei; and (c) maintaining said reaction mixture at a temperature of up to about 130° C. for a period of time from about 1 hour to about 10 days under crystallization conditions and in the absence of an added external liquid phase to form crystals of X zeolite.