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Molecular sieve core-mesoporous organosilicon hollow shell hierarchical porous composite material and preparation method thereof

A technology of mesoporous silicone and composite materials, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of unreported hollow core-shell hierarchical porous composite materials, and achieve high specific surface area. , the effect of a wide range of application prospects

Inactive Publication Date: 2019-03-29
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, hollow core-shell hierarchical porous composites with molecular sieves as the core and mesoporous silicone as the shell have not been reported.

Method used

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  • Molecular sieve core-mesoporous organosilicon hollow shell hierarchical porous composite material and preparation method thereof
  • Molecular sieve core-mesoporous organosilicon hollow shell hierarchical porous composite material and preparation method thereof
  • Molecular sieve core-mesoporous organosilicon hollow shell hierarchical porous composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Step 1, uniformly disperse 80mg of type A molecular sieve nanoparticle material in a mixed system of 22mL of water and 11mL of ethanol, then add 0.25mL of ammonia water and stir magnetically at room temperature, then add 0.12g of cetyltrimethylammonium bromide and continue stirring 30min, then dropwise added 0.15mL tetraethyl orthosilicate, stirred and hydrolyzed for 6h, centrifuged (12000rpm, 3min), washed 4 times with deionized water and ethanol, dried at room temperature, in 50mL ethanol solution of ammonium nitrate (nitric acid The mass ratio of ammonium and ethanol is 0.25:80~0.4:80) to extract and remove the surfactant to obtain a type A molecular sieve-mesoporous silica core-shell composite white powder;

[0027] Step 2: Accurately weigh 80 mg of the white powder of the above-mentioned type A molecular sieve-mesoporous silica core-shell complex and add it to a mixture of 22 mL of water and 11 mL of ethanol, then add 2 mL of ammonia water and stir magnetically at r...

Embodiment 2

[0030] Step 1, uniformly disperse 80mg of type A molecular sieve nanoparticle material in a mixed system of 22mL of water and 11mL of ethanol, then add 0.25mL of ammonia water and stir magnetically at room temperature, then add 0.12g of cetyltrimethylammonium bromide and continue stirring 30min, then dropwise added 0.13mL tetraethyl orthosilicate, stirred and hydrolyzed for 6h, centrifuged (12000rpm, 3min), washed 4 times with deionized water and ethanol, dried at room temperature, in 40mL ethanol solution of ammonium nitrate (nitric acid The mass ratio of ammonium and ethanol is 0.25:80~0.4:80) to extract and remove the surfactant to obtain a type A molecular sieve-mesoporous silica core-shell composite white powder;

[0031]Step 2: Accurately weigh 80 mg of the white powder of the above-mentioned type A molecular sieve-mesoporous silica core-shell complex and add it to a mixture of 22 mL of water and 11 mL of ethanol, then add 2 mL of ammonia water and stir magnetically at ro...

Embodiment 3

[0034] Step 1, uniformly disperse 80mg of type A molecular sieve nanoparticle material in a mixed system of 22mL of water and 11mL of ethanol, then add 0.25mL of ammonia water and stir magnetically at room temperature, then add 0.12g of cetyltrimethylammonium bromide and continue stirring 30min, then dropwise added 0.15mL tetraethyl orthosilicate, stirred and hydrolyzed for 6h, centrifuged (12000rpm, 3min), washed 4 times with deionized water and ethanol, dried at room temperature, in 40mL ethanol solution of ammonium nitrate (nitric acid The mass ratio of ammonium and ethanol is 0.25:80~0.4:80) to extract and remove the surfactant to obtain a type A molecular sieve-mesoporous silica core-shell composite white powder;

[0035] Step 2: Accurately weigh 80 mg of the white powder of type A molecular sieve-mesoporous silica core-shell complex and add it to a mixture of 22 mL of water and 11 mL of ethanol, then add 2 mL of ammonia water and stir magnetically at room temperature, the...

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Abstract

The invention discloses a molecular sieve core-mesoporous organosilicon hollow shell hierarchical porous composite material and a preparation method thereof, and belongs to the technical field of nano-composite materials. The hierarchical porous composite material adopting a traditional molecular sieve as a core and mesoporous organosilicon as a shell and generating large hollow cavities is prepared through combining a Stober process with a growth-induced corrosion process for the first time. The outer surface of the molecular sieve is coated with a mesoporous silica layer by the simple Stoberone-step synthesis process to obtain a double-layer core-shell structure, and a silicic acid species, obtained by hydrolysis and self-polymerization of organic organosilane and dissolving of the silica shell under an alkaline condition, is copolycondensed with an oligomer generated by hydrolysis of organosilane in the presence of a surfactant with the double-layer structure as a hard template bythe growth-induced corrosion process to obtain the mesoporous organosilicon shell in order to finally prepare the target product. The material can be widely applied to the fields of catalyzed green organic reactions and adsorption separation.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a molecular sieve core-mesoporous organosilicon hollow shell multilevel porous composite material and a preparation method thereof. technical background [0002] In recent years, zeolite molecular sieves have been widely used as adsorbents due to their high specific surface area and dense porosity. However, due to the limitation of the pore size of most molecular sieves, they cannot adsorb larger molecules, and it is difficult to achieve high adsorption and separation efficiency. At the same time, the hydrophilicity of molecular sieves also limits the catalytic activity of molecular sieves as solid acid catalysts in some organic reactions. [0003] Compared with traditional inorganic silica materials, ordered mesoporous organosilicon materials have a wide range of applications in catalysis, adsorption and separation due to their unique amphiphilicity, ...

Claims

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Application Information

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IPC IPC(8): B01D53/02C08G77/04
CPCB01D53/02B01D2253/25C08G77/04
Inventor 王润伟李夏宇张宗弢
Owner JILIN UNIV
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