Preparation method of ZSM-11 molecular sieve

Abstract

The invention relates to a preparation method of a ZSM-11 molecular sieve. The method comprises steps of: using an EU-1 molecular sieve as a seed; adding an EU-1 molecular sieve powder into a solution containing sodium hydroxide and a template; stirring uniformly and adding a silicon source to obtain a reaction mixture gel system, wherein a molar ratio of other components needed to be added into the reaction mixture gel system for per 100g of EU-1 molecular sieve seed is as below: 0-0.5 Na2O:0.8-5.0 SiO2:0.1-0.5 (TBA)2O:100(g)EU-1:20-110 H2O; crystallizing the reaction mixture gel under an enclosed condition at 120-180 DEG C for 36-72 h to obtain the ZSM-11 molecular sieve. Compared with a prior art, the invention has shortened crystallization time and reduced synthesis cost.

Description

technical field [0001] The invention relates to a synthesis technology of molecular sieves, in particular to a preparation technology of ZSM-11 molecular sieves. Background technique [0002] ZSM-11 molecular sieve is a molecular sieve with a MEL-type skeleton structure. Its all-silicon form of molecular sieve is Silicalite-2. It can be used as an inert carrier for shape-selective catalysts and a separation membrane material for organic-water phases, and has attracted widespread attention. [0003] In 1973 ChuP (USP3,709,979) used Bu 4 N + As a template agent, ZSM-11 molecular sieve was successfully synthesized. In 1978, Flanigen E M of U.C.C. Company successfully synthesized the last member of the Pentasil family, all-silicon ZSM-11-Silicalite-2, which in turn promoted the rapid development of the field of silica-rich zeolite synthesis. . In 1990, Mc William (USP4,894,212) et al. used octylamine as a template, and crystallized at 100-350°C for 12 hours-10 days by adding ...

AI Technical Summary

Problems solved by technology

The process of the above method is relatively complicated, and generally the crystallinity is not high in a relatively short period of time, and there are miscellaneous crystals

It takes a long time for crystallization to prepare ZSM-11 molecular sieve with no miscellaneous crystals, high crystallinity and high conversion rate, which has high energy consumption and low production efficiency

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