Hydro-thermal synthesis method for TS-1 molecular sieve and obtained product

Abstract

The invention provides a hydro-thermal synthesis method for a TS-1 molecular sieve. The hydro-thermal synthesis method includes the steps that 1, a silicon source and a template agent are mixed to obtain silicon source hydrolysate, a titanium source and polyhydric alcohol are mixed to be added into the silicon source hydrolysate, and then water is added; 2, a product obtained through step1 is subjected to pre-crystallization for 5-24 hours; 3, a silicon source is added again and heated to 60 DEG C-90 DEG C, and then polyhydric alcohol is removed; 4, a product obtained through step3 is crystallized, after the crystallization reaction, a reaction mixture is subjected to solid-liquid separation, and a solid is taken to be dried and calcined. In the hydro-thermal synthesis method, after the silicon source and the titanium source are gelatinized, alcohol is not removed, namely, crystallization is performed for 5-24 hours at 90 DEG C-100 DEG C under the presence of alcohol, in this way, forming of non-framework titanium can be effectively reduced, and the content of framework titanium can be increased. In the process of constructing a multi-level structure in the TS-1 molecular sieve, no mesporous template agent, organosilane and other organic additives are needed, in the whole synthesis process, operation is easy, the cost is low, an expected amplification effect is small, and large-scale industrial production and popularization are easy.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to the preparation and application of a titanium-containing molecular sieve catalyst. Background technique [0002] TS-1 molecular sieve is a kind of microporous molecular sieve with MFI topology. The four-coordinate titanium isolated on its skeleton is a good active center for oxidation reaction. The regular pore structure endows it with good shape selectivity and stability. The green oxidation system composed of TS-1 molecular sieve and hydrogen peroxide is widely used in selective oxidation reactions such as olefin epoxidation, phenol hydroxylation, ketone ammoximation, and alkane oxidation. It has mild reaction conditions, high atom utilization, and is environmentally friendly. Pollution and other outstanding advantages, it overcomes the disadvantages of traditional organic oxidation reaction, such as large amount of waste liquid and slag, and serious environmental pollution...

AI Technical Summary

Problems solved by technology

At present, most methods for synthesizing multi-level structure TS-1 molecular sieves use organic additives such as mesoporous templates or organosilanes, which increases production costs and is difficult to promote to industrial applications.

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