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Method for preparing Cu-doped SiO2 nano composite aerogel

A nanocomposite, aerogel technology, applied in aerogel preparation, nanotechnology, chemical instruments and methods, etc., to achieve the effects of perfect microstructure, large specific surface area, and good thermal stability

Inactive Publication Date: 2018-11-13
陈正新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the copper nitrate and tetraethyl orthosilicate composite sol system, the introduction of DMF for in-situ co-sol-gel, combined with the atmospheric pressure drying process to prepare composite aerogels has not been reported.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation of Cu-doped SiO 2 The method for nanocomposite airgel, comprises the steps: with 20 parts of Cu(NO 3 ) 2 ·3H 2 O was dissolved in 65 parts of absolute ethanol, then slowly added 12 parts of tetraethyl orthosilicate and 40 parts of deionized water, stirred on a constant temperature magnetic stirrer at 46°C for 12 minutes, added 8 parts of DMF and 6 parts of concentrated nitric acid, and continued to stir After 7 hours, pour the sol into a petri dish, age at 30°C for 4 days to form a gel, and then obtain the sky blue precursor complex alcohol gel; continue to age the obtained alcohol gel at 30°C for 24 hours, and then keep it at a constant temperature of 35°C Soak in 95 parts of a mixed solution of tetraethyl orthosilicate and absolute ethanol with a volume ratio of 1:1 for 2.5 days for aging, change the solvent every 24 hours to replace the water in the gel, and then wash with absolute ethanol 4 times, constant temperature drying at 35°C for 15 hours, th...

Embodiment 2

[0021] A preparation of Cu-doped SiO 2 The method for nanocomposite airgel, comprises the steps: 15 parts of Cu(NO 3 ) 2 ·3H 2 Dissolve O in 60 parts of absolute ethanol, then slowly add 8 parts of tetraethyl orthosilicate and 35 parts of deionized water, stir on a constant temperature magnetic stirrer at 44°C for 10 minutes, add 5 parts of DMF and 5 parts of concentrated nitric acid, and continue stirring After 6.5 hours, pour the sol into a petri dish, age at 25°C for 3 days to form a gel, and then obtain the sky blue precursor complex alcohol gel; after aging the obtained alcohol gel at 25°C for 23 hours, Soak 90 parts of a mixed solution of tetraethyl orthosilicate and absolute ethanol with a volume ratio of 1:1 at constant temperature for 2 days for aging, change the solvent every 24 hours to replace the water in the gel, and then wash with absolute ethanol 3 times, constant temperature drying at 34°C for 14 hours, then constant temperature drying at 60°C for 71 hours,...

Embodiment 3

[0023] A preparation of Cu-doped SiO 2 The method for nanocomposite airgel, comprises the steps: with 25 parts of Cu(NO 3 ) 2 ·3H 2 Dissolve O in 70 parts of absolute ethanol, then slowly add 14 parts of tetraethyl orthosilicate and 45 parts of deionized water, stir on a constant temperature magnetic stirrer at 48°C for 15 minutes, add 10 parts of DMF and 7 parts of concentrated nitric acid, and continue stirring After 7.5 hours, pour the sol into a petri dish, age at 35°C for 5 days to form a gel, and then obtain the sky blue precursor complex alcohol gel; after aging the obtained alcohol gel at 35°C for 25 hours, Soak in 100 parts of a mixed solution of tetraethyl orthosilicate and absolute ethanol with a volume ratio of 1:1 for 3 days for aging at constant temperature, change the solvent every 24 hours to replace the water in the gel, and then wash with absolute ethanol 5 times, constant temperature drying at 36°C for 16 hours, and then constant temperature drying at 65°...

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PUM

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Abstract

The invention discloses a method for preparing a Cu-doped SiO2 nano composite aerogel. The method comprises the following steps: dissolving Cu(NO3)2.3H2O into absolute ethyl alcohol, adding tetraethylorthosilicate and deionized water, stirring, adding DMF and concentrated nitric acid, continuing to stir for 6.5-7.5 h, pouring a sol into a culture dish, aging for 3-5 d, and thus obtaining a precursor composite alcogel; then continuing to age the obtained alcogel for 23-25 h at the temperature of 25-35 DEG C, soaking in a mixed solution of tetraethyl orthosilicate and absolute ethyl alcohol atthe constant temperature of 34-36 DEG C, soaking for 2-3 d, washing, carrying out constant temperature drying at the temperature of 34-36 DEG C for 14-16 h, and carrying out constant temperature drying at the temperature of 60-65 DEG C for 71-73 h; and finally, putting the sample into an electric furnace, treating for 4-6 h at the temperature of 740-760 DEG C, and then cooling. The composite aerogel prepared by the method has the advantages of small particle size, large specific surface area, perfect microstructure and good thermal stability.

Description

technical field [0001] The invention relates to a method for preparing Cu-doped SiO 2 Nanocomposite Airgel Approach. Background technique [0002] Due to its good catalytic oxidation and catalytic reduction properties, transition metal Cu has been widely used in the epoxidation of organic matter, CO and NO x Catalytic oxidation, hydrogenation and dehydrogenation of hydrocarbons and other chemical engineering. Doping Cu into various catalyst supports tends to improve the catalytic activity of the catalyst. SiO 2 Airgel is a new type of porous amorphous solid-state nanomaterial. Because of its unique properties such as high specific surface area, high porosity, and low density, it has attractive application prospects in many fields, especially as a catalyst and carrier. . Even a small amount of copper (such as 1%-5%, mass fraction) loaded on SiO 2 In the carrier, it will also effectively improve the catalytic performance of the composite gel, so this type of material has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/00B82Y40/00B01J23/72
CPCB01J13/0091B01J23/72B82Y40/00
Inventor 陈正新
Owner 陈正新
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