Preparation method for high-stable-activity titanium silicalite molecular sieve catalyst

Abstract

The invention discloses a preparation method for a high-stable-activity titanium silicalite molecular sieve catalyst. The method comprises the following steps: uniformly mixing tetraethoxysilane, tetrapropylammonium hydroxide, polyoxyethylene ether-polypropylethylene ether-polyoxyethylene ether (P123), polyether modified fluorine-containing polydimethylsiloxane and distilled water, and producing a hydrolysis reaction to obtain a tetraethoxysilane hydrolysis solution; adding tetrabutyl titanate, isopropanol and 8-fluoro-4-hydroxy-2-trifluoromethylquinoline, mixing to obtain a mixed solution, producing an ageing reaction of the mixed solution, filtering a product, washing with water, and drying to obtain a titanium silicalite molecular sieve immediate product; roasting to obtain the titanium silicalite molecular sieve catalyst. Due to the adoption of the fluorosilicone structure, the acid and alkali resistance of a molecular sieve framework is improved, the silicon dissolution loss of the molecular sieve framework of the catalyst is inhibited, and the inherent structure of a molecular sieve is kept; 8-fluoro-4-hydroxy-2-trifluoromethylquinoline and titanium form a chelate, so that the catalyst on the molecular sieve framework is relatively firm in position and difficult in loss, and the service life of the catalyst is prolonged.

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...

AI Technical Summary

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

Images