Preparation of Mg alkali zeolite by vapor phase self crystallization

Abstract

A process for preparing the magnesium-alkali zeolite (FER) by vapor phase transfer (VPT) method includes such steps as preparing the gel from the mixture of alkali metal, oxide of. 3-valence element, oxide of 4-valence element and water, dewatering to obtain dried gel, and self crystallizing in Teflon / water vapor at 100-200 deg.C.

Description

technical field

[0001] The invention belongs to the technical field of material synthesis, and in particular relates to a method for preparing ferrierite (FER) by self-rotating crystals in a vapor phase. Using THF / H 2 The O mixture is used as the vapor phase in the vapor phase transport method, the amount of template agent is small, the reaction temperature is low, and the crystallinity of the product is high. Background technique

[0002] Zeolite molecular sieve is an inorganic aluminosilicate crystal. Its skeleton contains regular and orderly arranged pores or cages of molecular size (pore size 0.3-1.5nm). It has the functions of shape-selective catalysis, ion exchange and molecular sieving. Widely used in crude oil refining, petroleum catalytic cracking and petrochemical and other fields.

[0003] FER (ZSM-35, ferrierite) is a zeolite with a mesopore structure, which contains ten-membered ring channels (0.42×0.54nm, along the

[001] direction) and crossed eight-membered ...