Preparation method of a highly stable and active titanium-silicon molecular sieve catalyst

Abstract

A preparation method of a highly stable and active titanium-silicon molecular sieve catalyst, which involves modifying tetraethyl orthosilicate, tetrapropylene-grade ammonium hydroxide, polyoxyethylene ether-polypropylene ether-polyoxyethylene ether (P123), and polyether Fluorine-containing polydimethylsiloxane and distilled water are mixed uniformly for hydrolysis reaction to obtain a hydrolysis solution of tetraethyl orthosilicate, and then tetrabutyl titanate, isopropanol, 8-fluoro-4-hydroxy-2- Trifluoromethylquinoline is mixed to obtain a mixed solution, which is subjected to an aging reaction, and the product is filtered, washed with water, and dried to obtain an intermediate product of a titanium-silicon molecular sieve, and then roasted to obtain a titanium-silicon molecular sieve catalyst. The fluorosilicon structure of the present invention improves the acid and alkali resistance of the molecular sieve framework, inhibits the dissolution and loss of the catalyst molecular sieve framework silicon, and maintains the inherent structure of the molecular sieve. 8-fluoro-4-hydroxyl-2-trifluoromethylquinoline and titanium The chelate is formed to make it more firm on the molecular sieve framework and not easy to be lost, which improves the life of the catalyst.

Description

technical field [0001] The invention relates to a preparation method of a molecular sieve catalyst, in particular to a preparation method of a titanium-silicon molecular sieve catalyst. Background technique [0002] The application of molecular sieves in the production of fine chemical products can not only change the environmental pollution caused by traditional production processes, but also have good social benefits, and the added value of its products is high, which can produce good economic benefits. The successful development of titanium-silicon molecular sieve catalysts is considered a milestone in zeolite catalysis in the 1980s, laying the foundation for the study of highly selective hydrocarbon oxidation reactions and the development of green processes. There have been some reports on the preparation technology of similar catalysts at home and abroad: the patent US4410501 adopts two kinds of hydrothermal methods to synthesize successfully for the first time. ) is t...

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Problems solved by technology

The cause of detitanium removal is the dissolution of silicon, and the process of silicon dissolution and detitanium removal is accompanied by the enhancement of surface acidity and the change of catalytic performance, resulting in a decrease in reaction performance

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