A kind of preparation method of bifunctional titanium silicate molecular sieve

Abstract

The invention provides a preparation method of a bifunctional titanium-silicon molecular sieve, which is characterized in that it uses cheap silicon sources, titanium sources, template agents, alkali sources and trivalent metal salts as raw materials, and is synthesized by a hydrothermal synthesis method. The product prepared by the method of the invention not only has high selective oxidation activity, but also has strong acid catalytic activity.

Description

technical field [0001] The invention provides a preparation method of a bifunctional titanium-silicon molecular sieve, and more specifically relates to a preparation method of a titanium-silicon molecular sieve having redox catalytic activity and acid catalytic activity. Background technique [0002] Titanium silicate molecular sieve TS-1 is a new type of catalytic material with redox ability developed in the early 1980s. TS-1 molecular sieve for H 2 o 2 Participated in many organic oxidation reactions, such as propylene epoxidation to propylene oxide, phenol hydroxylation to quinone, cyclohexanone amine oxidation, cyclohexanone oxime, etc., have excellent catalytic activity and selective oxidation function. Prototype molecular sieve catalysts have good application prospects. Since then, efforts have been made to convert other metal ions (B 3+ 、Al 3+ , Ga 3+ and Fe 3+ ) and titanium are doped into the molecular sieve framework in order to modify the catalytic performa...

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Problems solved by technology

[0005] The preparation cost of bifunctional titanium-silicon molecular sieve (M-TS-1) is mainly reflected in the usage amount of expensive tetrapropylammonium hydroxide (TPAOH). The usage amount of M-TS-1 is relatively large, which makes the preparation cost of M-TS-1 higher, and the preparation process is complicated, and the operation is stricter, which strictly restricts the industrial application of M-TS-1 molecular sieve.

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