Preparation method of hierarchical pore TS-1 molecular sieve

Abstract

The invention discloses a preparation method of a hierarchical pore TS-1 molecular sieve, wherein the hierarchical pore TS-1 molecular sieve is obtained by taking a silicon-titanium ester polymer as atitanium-silicon source. According to the method, silicon and titanium are uniformly linked to the same polymer, and the hydrolysis rate is equivalent during hydrolysis, so that TiO2 precipitation can be prevented, and generation of non-framework titanium is reduced; and the novel silicon-titanium ester polymer can be used as a silicon source and a titanium source and can also be used as a mesoporous template agent in the synthesis process, so that the obtained TS-1 molecular sieve has a mesoporous structure and narrow pore size distribution.

Description

technical field [0001] The application relates to a method for preparing a multi-stage porous TS-1 molecular sieve, which belongs to the field of molecular sieve preparation. Background technique [0002] TS-1 molecular sieve is a microporous molecular sieve with MFI topology, due to the presence of tetrahedral Ti in its framework structure 4+ center, thus for H 2 o 2 Participated in the selective oxidation of organic matter has a good catalytic effect, such as epoxidation of olefins, hydroxylation of phenols, ammoximation of ketones, oxidation of alkanes and other selective oxidation reactions. The catalytic oxidation process of TS-1 molecular sieve has no pollution, and the reaction conditions are mild, which overcomes the shortcomings of serious pollution and lengthy reaction process in the traditional process. [0003] There are two main factors affecting the activity and stability of TS-1: one is the content of framework titanium and non-framework titanium in the mol...

AI Technical Summary

Problems solved by technology

Among them, the soft template method such as Zhou Xinggui (CN103357432A) utilizes polyether type Pluronic F127 as a mesoporous template agent, and the xerogel method synthesizes mesoporous nanometer TS-1 molecular sieve; Zhang Shufen (CN102910643A) utilizes hexadecyltrimethylammonium bromide Introducing mesoporous channels into titanium-silicon molecular sieves as mesoporous templating agent; wherein the hard template method such as Chen Lihua et al. TS-1 nanocrystals were grown within the channel, and the hard template was removed to prepare a hierarchical TS-1 molecular sieve; Li Gang et al. (CN101962195A) used cheap sugar instead of porous carbon material as a macroporous-mesoporous template. During the process of heat-treating the TS-1 molecular sieve synthetic sol of sugar, the sugar is heated, carbonized and dehydrated to form a hard template directly, and a multi-level pore TS-1 molecular sieve is obtained, but the activity and stability of the TS-1 molecular sieve need to be improved.

Images