Modified silicon dioxide mesoporous catalyst and preparation method thereof

Abstract

The invention belongs to the field of catalysts, and particularly relates to a modified silicon dioxide mesoporous catalyst and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving cetyl trimethyl ammonium bromide (CTAB) in distilled water, stirring for 30 minutes at room temperature, and then sequentially adding ammonia water and tetraethoxysilane (TEOS) to obtain a post-mixed solution; 2) adding a cesium fluoride solution and a silver nitrate solution into the mixed solution obtained in the step 1); stirring at room temperature; and 3) adding themixture obtained in the step 2) into a reaction kettle containing a polytetrafluoroethylene lining, crystallizing, taking out the sample, carrying out suction filtration, washing and drying, and carrying out high-temperature roasting in a muffle furnace. In the preparation process of the modified silicon dioxide mesoporous catalyst, due to the fact that one-step synthesis is adopted, cesium fluoride and silver oxide directly enter the skeleton structure of the catalyst carrier, and uniform distribution of cesium fluoride and silver oxide components is guaranteed.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a modified silica mesoporous catalyst and a preparation method thereof. Background technique [0002] Hexafluoropropylene oxide, also known as perfluoropropylene oxide, was first reported by DuPont in the 1960s on the synthesis method of hexafluoropropylene oxide. It is an important intermediate in the field of organic fluorine chemistry. Basic raw materials for fluorine functional compounds, such as perfluoropropionyl fluoride, hexafluoroacetone, perfluoroalkyl vinyl ether, perfluoropolyether, etc. Therefore, how to synthesize hexafluoropropylene oxide economically and efficiently is an important research topic of fluorine chemical industry, because it can directly reduce the cost of various fluorine-containing functional compounds and expand its application fields. The synthesis of hexafluoropropylene oxide is basically the preparation of hexafluoropropylene oxide from hex...

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Problems solved by technology

[0006] However, in the previous reports on the oxygen gas-phase catalytic oxidation method, the preparation process of the catalyst required for the reaction is complicated, and the loading and roasting of the active components and modifiers need to be carried out in multiple steps.

In addition, because the catalyst needs to be impregnated in multiple steps, it is difficult to disperse the carrier, active components and modifiers uniformly, and the specific surface area of ​​the carrier material used in the reaction is small, and the conversion rate of the reaction is compared with that of the oxygen liquid phase oxidation method. Low

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