METHOD FOR PREPARATION OF MORDENITE

摘要

The present invention provides a method for preparing a mordenite, which is a method for preparing the mordenite through a hydrothermal crystallization by using natural aluminosilicate minerals as total silicon sources and total aluminum sources, comprising the steps of: subjecting the natural aluminosilicate minerals to activation treatment which is an activation by sub-molten salt and an activation by thermal treatment; selecting and mixing the activated natural aluminosilicate minerals according to the silicon-to-aluminum ratio of the targeted mordenite, adding thereto deionized water, sodium hydroxide, crystal seed, a templating agent to obtain a reaction mixture; adjusting the reaction mixture by using an inorganic acid to have a pH of 10-13, and then aging it at 40-80° C. for 6-24 hours; and subjecting the aged reaction mixture to hydrothermal crystallization, and then filtering, washing, drying and calcinating the crystallized product to obtain the mordenite. The method for preparing a mordenite provided in the present invention enlarges the sources of raw materials for a molecular sieve, has a low cost and a simple process route, and can largely reduce the cost for synthesizing a molecular sieve.

主权项

1. A method for preparing a mordenite, which is a method for preparing the mordenite through a hydrothermal crystallization by using natural aluminosilicate and silicate minerals as total silicon sources and total aluminum sources, comprising the steps of:
subjecting the natural aluminosilicate and silicate minerals to activation treatment which is a sub-molten salt activation and/or a thermal treatment activation; selecting and mixing the activated natural aluminosilicate and silicate minerals according to the silicon-to-aluminum ratio of the targeted mordenite, adding thereto deionized water, sodium hydroxide, crystal seed, a templating agent to obtain a reaction mixture having a composition by mole of SiO2:Al2O3=10-40:1, H2O:SiO2=30-90:1, Na2O:SiO2=0.1-0.4:1, and the templating agent: SiO2=0-0.6:1, in which the crystal seed is added in amount of 0-10 wt % based on the total mass of the reaction mixture; adjusting the reaction mixture by using an inorganic acid to have a pH of 10-13, and then aging it at 40-80° C. for 6-24 hours; and where the templating agent is not added, subjecting the aged reaction mixture to hydrothermal crystallization, and then filtering, washing and drying the crystallized product to obtain the mordenite; and where the templating agent is added, subjecting the aged reaction mixture to hydrothermal crystallization, and then filtering, washing, drying and calcinating the crystallized product to obtain the mordenite.