Modified silicon dioxide mesoporous catalyst and preparation method thereof

A technology of silica and mesoporous silica, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc. The specific surface area is small, and the synthesis process is simplified, the method is simple, and the catalytic performance is good.

Active Publication Date: 2020-08-11
TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 need

Method used

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  • Modified silicon dioxide mesoporous catalyst and preparation method thereof
  • Modified silicon dioxide mesoporous catalyst and preparation method thereof
  • Modified silicon dioxide mesoporous catalyst and preparation method thereof

Examples

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Embodiment 1-5

[0022] Dissolve a certain amount of cetyltrimethylammonium bromide (CTAB) in a certain amount of distilled water, stir at room temperature for 30 minutes, then add a certain amount of ammonia water, and then add tetraethyl orthosilicate (TEOS), The molar ratio of each component in the solution is: TEOS:CTAB:NH3:H2O=1:0.15:0.68:43. The above solution was stirred again at room temperature for 1 hour, and then different cesium fluoride solutions and silver nitrate solutions were added thereto, and different catalysts were prepared by adding different amounts of cesium fluoride and silver nitrate (see Table 1). Stir again at room temperature for 1 hour, then put it into a reaction kettle with a polytetrafluoroethylene liner, and crystallize at 120 °C for 48 hours. The sample was taken out again, then washed by suction filtration, dried, and then roasted in a muffle furnace at 400 degrees Celsius for 6 hours.

[0023] Tablet granulation: Press the calcined powder catalyst with a t...

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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...

Claims

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Application Information

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IPC IPC(8): B01J29/03B01J35/10B01J37/10C07D303/48C07D301/10
CPCB01J29/0325B01J35/1023B01J35/1061B01J37/10C07D303/48C07D301/10B01J2229/183B01J2229/40Y02P20/584
Inventor 冀汝南于颖肖鑫
Owner TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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