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A kind of preparation method of ordered mesoporous silicon boron carbon nitrogen material

A boron carbon nitride and mesoporous silicon technology, which is applied in the field of preparation of ordered mesoporous silicon boron carbon nitride materials, can solve the problems of poor hydrothermal stability, poor chemical stability and the like, achieves good oxidation resistance, simple preparation process, The effect of good chemical stability

Active Publication Date: 2019-12-31
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation method of ordered mesoporous silicon boron carbon nitrogen material, which overcomes the shortcomings of poor chemical stability and poor hydrothermal stability of existing ordered mesoporous materials, and has higher resistance High temperature performance and oxidation resistance

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Under the protection of nitrogen, 13.9g of butyldichloroborane, 11.5g of methyldichlorosilane, and 64.4g of hexamethyldisilazane were respectively dissolved in n-hexane to form a solution, and then hexamethyldisilazane Add the silazane n-hexane solution into a three-necked flask with a constant-pressure separating funnel, add the n-hexane solutions of butyldichloroborane and methyldichlorosilane into the constant-pressure separating funnel, and place in a -15°C In the reaction bath, the n-hexane solution of butyldichloroborane and methyldichlorosilane was slowly added dropwise while stirring the n-hexane solution of hexamethyldisilazane. After the dropwise addition, the temperature of the reaction solution was raised to room temperature and stirred for 24 h to obtain a clear and transparent solution.

[0027] (2) Under the protection of nitrogen, transfer the clear and transparent solution obtained in step (1) to another three-necked flask, place it in an oil bath, ...

Embodiment 2

[0032] (1) Under nitrogen protection, 15.7g butyldichloroborane, 20.2g methyldichlorosilane, and 106.2g hexamethyldisilazane were dissolved in n-hexane to form a solution, and then hexamethyldisilazane Add the silazane n-hexane solution into a three-necked flask with a constant-pressure separating funnel, add the n-hexane solutions of butyldichloroborane and methyldichlorosilane into the constant-pressure separating funnel, and place in a -15°C In the reaction bath, the n-hexane solution of butyldichloroborane and methyldichlorosilane was slowly added dropwise while stirring the n-hexane solution of hexamethyldisilazane. After the dropwise addition, the temperature of the reaction solution was raised to room temperature and stirred for 30 h to obtain a clear and transparent solution.

[0033] (2) Under the protection of nitrogen, transfer the clear and transparent solution obtained in step (1) to another three-necked flask, place it in an oil bath, adjust the temperature contr...

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Abstract

The invention relates to a preparation method of an ordered mesoporous silicon-boron-carbon-nitrogen material. The preparation method comprises the following steps: under the protection of nitrogen gas, dripping butyldichloroborane and dichloromethylsilane solutions into a hexamethyldisilazane solution at the same time; then raising the temperature and stirring to obtain a clarified transparent solution; raising the temperature of an oil bath and reacting to obtain a polyborosilazane precursor solid; dissolving the polyborosilazane precursor solid into a solvent and evaporating the oil bath to obtain a self-assembled polyborosilazane precursor; carrying out heat treatment to obtain a cross-linked self-assembled polyborosilazane precursor; under an ammonia gas atmosphere, raising the temperature and carrying out cracking; then cooling to room temperature, so as to obtain the ordered mesoporous silicon-boron-carbon-nitrogen material. The ordered mesoporous silicon-boron-carbon-nitrogen material prepared by the preparation method provided by the invention has large specific surface area and extremely excellent high-temperature stability, oxidation resistance, hydrothermal stability and chemical stability.

Description

technical field [0001] The invention belongs to the technical field of ordered mesoporous materials, in particular to a preparation method of ordered mesoporous silicon boron carbon nitrogen materials. Background technique [0002] Ordered mesoporous materials are widely used in catalysis, adsorption and separation, biomedical synthesis and other fields due to their excellent structural properties such as large specific surface area, highly regular pore structure, and narrow and adjustable pore size distribution. However, ordered mesoporous materials have not yet been applied in large-scale industries, mainly because the existing mesoporous materials have poor thermal stability, hydrothermal stability, and corrosion resistance, which limit their applications. [0003] As a new type of multi-phase high-temperature structural ceramics, silicon-boron-carbon-nitrogen ceramics have excellent high-temperature thermal stability and chemical stability, and can maintain an amorphous ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B35/00
CPCC01B35/00C01P2006/12C01P2006/16
Inventor 刘勇彭帅崔永杰常雪峰张晨宇韩克清张辉余木火
Owner DONGHUA UNIV
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