Synthetic method for mesopore titanium-silicon molecular sieve

Abstract

The invention belongs to the mesopore material preparation field, concretely relates to a synthetic method for a mesopore titanium-silicon molecular sieve. The method is characterized in that a low temperature rapid crystallization method is used, an inorganic silicon source and an inorganic titanium source are taken as the raw materials, a quaternary ammonium cationic surfactant is taken as a template agent, a Ti-MCM-41 molecular sieve with an ordered mesoporous structure and high specific surface area can be obtained through product recovery. Compared with the preparation method of the traditional Ti-MCM-41 molecular sieve, the method uses the inorganic silicon source and the titanium source as the raw materials, simultaneously the auxiliary template agent is avoided to use, so that the generation of TiO2 outside of a framework is reduced, the synthetic process is simplified and the synthesis cost is reduced; The method of the invention uses the low temperature rapid crystallization method and avoids a hydrothermal synthesis method, and has the advantages of simple operation, easy repetition, short synthesis time, low equipment requirement, easy process control and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of mesoporous materials, and in particular relates to a method for synthesizing mesoporous titanium-silicon molecular sieves. Background technique [0002] Titanium silicate molecular sieve is a new type of catalytic material (US4410501) that appeared in the 1980s. Since the transition metal titanium has a variable valence state, the introduction of titanium endows titanium-silicon molecular sieves with unique catalytic oxidation functions in the epoxidation of olefins, hydroxylation of aromatics, ammoxidation of ketones, and oxidation reactions of alcohols, alkanes and sulfides exhibited excellent catalytic performance. However, the pore size of the titanium silicalite molecular sieve catalyst is small (<0.7nm), which cannot meet the needs of the oxidation reaction in which macromolecules participate. [0003] In 1992, Mobil researchers successfully synthesized the M41S series of mesopor...

AI Technical Summary

Problems solved by technology

The use of auxiliary templates not only complicates the synthesis process, but also increases the cost of synthesis; the use of hydrothermal synthesis not only requires higher temperatures, but also takes a long time, and requires the use of high-pressure synthetic kettles

The above disadvantages will increase the difficulty of industrial production

[0005] Due to the expensive organic raw materials and organic auxiliary templates used in the synthesis of mesoporous titanium-silicon molecular sieve Ti-MCM-41, the synthesis conditions are complicated and harsh, and the synthesis cycle is long, which limits the large-scale production and industrialization of Ti-MCM-41 molecular sieve materials. application

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