Method for synthesizing ZSM-48 zeolite through solvent-free solid-phase synthesis

Abstract

The invention relates to a molecular sieve preparation technology, and aims at providing a method for synthesizing ZSM-48 zeolite through solvent-free solid-phase synthesis. The method comprises the following steps of using a silicon source, an aluminum source, ammonium fluoride and 4-dimethylamiopryidine used as a template agent into a mortar; performing grinding for 5 min; putting a mixture obtained after the grinding into a reaction kettle; performing crystallization reaction for 1 to 8d at 140 to 200 DEG C; after the reaction is completed, performing suction filtration and drying on the products to obtain the ZSM-48 zeolite. Compared with the prior art, the product obtained through preparation has the advantages that the good crystallinity and purity are maintained; good catalytic reaction activity is realized. No solvent is used in the whole production process; unnecessary loss in the production process is reduced; the yield is greatly improved. The synthesis operation is simple; the implementation is easy; the cost of using the expensive organic template agents is reduced; the important significance is realized in the practical chemical production field.

Description

technical field [0001] The invention belongs to a molecular sieve preparation method, in particular to a solvent-free solid-phase synthesis method of ZSM-48 zeolite under the action of a novel template agent. Background technique [0002] Silica-based zeolite molecular sieve materials are widely used in petrochemical and fine chemical industries. One-dimensional ten-membered ring silica-based zeolite molecular sieves are an important family, and the common ones are ZSM-22, ZSM-48, EU-1 and so on. Among them, the pore size of ZSM-48 zeolite is 0.53nm×0.56nm, which has good thermal and hydrothermal stability and adjustable acidity. Therefore, ZSM-48 zeolite shows excellent catalytic performance in reactions such as shape-selective catalysis, alkylation, and hydroisomerization. [0003] However, the traditional ZSM-48 zeolite is synthesized in a hydrothermal system, which makes its synthesis efficiency low and has certain safety hazards. On the other hand, the organic templa...

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Problems solved by technology

[0003] However, the traditional ZSM-48 zeolite is synthesized in a hydrothermal system, which makes its synthesis efficiency low and there are certain safety hazards

On the other hand, the organic template for the synthesis of ZSM-48 zeolite is mainly hexamethylammonium bromide, which also greatly increases the cost of synthesis and limits its application.

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