Synthetic method of TS-1 titanium silicate molecular sieve

Abstract

The invention relates to a titanium silicate molecular sieve and a synthetic method thereof. The synthetic method comprises the following steps: mixing a silicon source, a titanium source, a template and water, stirring and hydrolyzing, putting the product into a hydro-thermal synthesis kettle and carrying out a pre-crystallization reaction; mixing the pre-crystallization product and a silicon source, uniformly stirring, carrying out hydro-thermal synthesis, washing and roasting to obtain the TS-1 molecular sieve. The synthesis process of the titanium silicate molecular sieve is easy to control and has good repeatability. Meanwhile, the catalyst has a higher catalytic activity, and use amount of the template is greatly reduced and synthesizing cost of the titanium silicate molecular sieve is decreased. The synthetic method of the invention is convenient for industrial production.

Description

technical field [0001] The invention belongs to the field of molecular sieve synthesis, and in particular relates to a molecular sieve and a synthesis method thereof, that is, a synthesis method of TS-1 titanium-silicon molecular sieve. Background technique [0002] Titanium silicate molecular sieve (TS-1) is a heteroatom molecular sieve developed in the early 1980s. It introduces titanium atoms into the silicon framework with MFI topology to form a special Ti-O-Si bond, which makes it have both catalytic oxidation activity and type-selective catalytic performance. TS-1 is mostly used to catalyze a variety of organic oxidation reactions, especially the oxidation system of hydrogen peroxide, such as phenol hydroxylation, cyclic ketone ammoxidation, etc. Its catalytic process is simple, with few other by-products, and it has good atom economy and environmental friendliness properties, showing good application prospects. [0003] The catalytic activity of TS-1 molecular sieve...

AI Technical Summary

Problems solved by technology

In the traditional synthesis method, tetrapropylammonium hydroxide is used as a template, and its molar ratio to silicon content is 1:0.4-1.0, which is used in a large amount. However, the template is expensive, resulting in high synthesis cost of TS-1 molecular sieve.

Afterwards, many literatures reported cost-reducing synthesis methods, including finding alternatives to TPAOH, reducing the amount of TPAOH, etc. However, the synthesized TS-1 molecular sieve has large grains or low titanium skeleton content, which makes it difficult to achieve high catalytic activity.

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