Fluorine-contained T-shaped zeolite molecular sieve and preparation method thereof

Abstract

The invention provides a method for preparing a fluorine-contained T-shaped zeolite molecular sieve and a preparation method thereof. The preparation method is characterized by comprising the following steps of: directly adding villiaumite in synthetic sol, and then inducing by using a nano T-shaped zeolite molecular sieve seed crystal to prepare the fluorine-contained T-shaped zeolite molecular sieve. In a formed SiO2-K2O-Al2O3-MF-H2O system, the sol proportions are expressed as follows by the molar ratio of each substance: 10-50% of SiO2-Al2O3, 18-50% of H2O / SiO2, 0.2-0.5% of K2O / SiO2 and 0.05-1.5% of MF / SiO2. The method concretely comprises the following steps of: adding 0.1-2 wt% of nano molecular sieve seed crystal after stirring and aging the sol for 20-30 hours at 50-60 DEG C, thermally synthesizing for 0.5-4 days in water at the synthetic temperature of 90-130 DEG C, and then centrifuging, cleaning and drying to obtain the fluorine-contained T-shaped zeolite molecular sieve; and the chemical formula of the crystal molecular sieve is M+(x+y)[Si18-yAlyO36Fx](x+y)-, wherein x is equal to 0.001-1, y is equal to 2-4.5, and M is Na+ or K+ or NH4+. The invention synthesizesthe fluorine-contained T-shaped zeolite molecular sieve in one step without using expensive organic template agents and a complicated postprocessing process, has the advantages of simple synthesizing process, lower cost and suitability for industrial amplified production, and can be effectively applied to the fields of adsorption separation, catalysis and the like.

Description

technical field [0001] The invention relates to the preparation and application of T-type zeolite molecular sieves, in particular to the preparation technology of fluorine-containing T-type zeolite molecular sieves, and belongs to the field of molecular sieve material preparation and application. Background technique [0002] Molecular sieves are a class of porous aluminosilicate crystals with uniform-sized pores, and the most basic structural unit of molecular sieves is TO 4 Tetrahedral (T=Al, Si). Each of the oxygen atoms is shared by two adjacent tetrahedral structures, but the same oxygen atom cannot be shared between two aluminum atoms. These tetrahedrons combine with each other to form a network structure, so as to form a one-dimensional or multi-dimensional molecular-sized channel structure. Molecular sieves are widely used in shape-selective catalysis, ion exchange and adsorption separation. The silicon-aluminum ratio of T-type zeolite molecular sieve is 3-4, and ...

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Problems solved by technology

US5338525 describes the SiO 2 -Ga 2 o 3 -Al 2 o 3 -NaF-H 2 Ga and Al type ZSM-5 zeolite molecular sieves were synthesized in the O system, however, the elemental analysis results of the product showed that no F element was found in the product

[0006] According to the existing literature, it is difficult to directly introduce fluorine atoms into the crystal framework of zeolite molecular sieves in the report of directly adding fluorine source to the sol to synthesize zeolite molecular sieves.

There is no report on fluorine-containing T-type zeolite molecular sieve

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