Amino hybrid SiO2 aerogel material and application thereof

A technology of airgel and amino, which is used in the development of new materials and new applications, can solve the problems of high adsorption and desorption temperature, low adsorption capacity, low cycle absorption efficiency, etc., and achieve reduced operation steps and high adsorption selectivity High, easy industrial production effect

Active Publication Date: 2014-04-09
江苏安珈新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing solid adsorbents have defects such as low cycle absorption efficiency, high adsorption and desorption temperature, and low adsorption capacity under normal pressure.

Method used

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  • Amino hybrid SiO2 aerogel material and application thereof
  • Amino hybrid SiO2 aerogel material and application thereof
  • Amino hybrid SiO2 aerogel material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] At 0°C, tetraethyl orthosilicate, absolute ethanol, deionized water and 3-aminopropyltriethoxysilane were stirred and mixed evenly, and then left to stand to obtain amino hybrid SiO 2 Wet gel, the wet gel continued to age at 20°C for 24 hours, during the aging period, the wet gel was solvent-substituted 6 times with absolute ethanol to obtain an alcohol gel, and the alcohol gel was subjected to CO at 50°C and 10MPa 2 Amino-hybrid SiO obtained by supercritical drying for 4 hours 2 Airgel, in which tetraethylorthosilicate: 3-aminopropyltriethoxysilane=1:4, (tetraethylorthosilicate+3-aminopropyltriethoxysilane): absolute ethanol : deionized water = 1:3:3. Amino hybrid SiO 2 The density of airgel is 0.11g / cm 3 , the specific surface area is 118m 2 / g, CO at 20 and 50°C 2 The adsorption capacity was 4.5 and 3.8 mmol / g.

[0021] See attached picture, figure 1 Amino hybrid SiO made for Example 1 2 A sample photo of the airgel.

[0022] See attached picture, figure 2...

example 2

[0025] At 10°C, tetraethyl orthosilicate, absolute ethanol, deionized water and 3-aminopropyltrimethoxysilane were stirred and mixed evenly, and then left to stand to obtain amino hybrid SiO 2 Wet gel, the wet gel continued to age at 30°C for 18 hours, during the aging period, the wet gel was solvent-substituted 5 times with absolute ethanol to obtain an alcohol gel, and the alcohol gel was subjected to CO at 40°C and 12MPa 2 Amino-hybrid SiO obtained by supercritical drying for 6 hours 2 Airgel, where tetramethyl orthosilicate: 3-aminopropyltrimethoxysilane=1:1, (tetramethyl orthosilicate + 3-aminopropyltrimethoxysilane): absolute ethanol: go Ionized water = 1:4:4. Amino hybrid SiO 2 The density of airgel is 0.10g / cm 3 , the specific surface area is 252m 2 / g, CO at 20 and 50°C 2 The adsorption capacity was 2.8 and 1.8 mmol / g.

example 3

[0027] At 20°C, tetraethyl orthosilicate, absolute ethanol, deionized water and 11-aminoundecyltriethoxysilane were stirred and mixed evenly, and then left to stand to obtain amino hybrid SiO 2 Wet gel, the wet gel was aged at 40°C for 12 hours, during the aging period, the wet gel was solvent-substituted 4 times with absolute ethanol to obtain the alcohol gel, and the alcohol gel was subjected to CO at 40°C, 8MPa 2 Amino-hybridized SiO was obtained by supercritical drying for 2 hours 2 Airgel, in which tetraethylorthosilicate: 11-aminoundecyltriethoxysilane=1:2, (tetraethylorthosilicate+11-aminoundecyltriethoxysilane) : absolute ethanol: deionized water = 1:2:3. Amino hybrid SiO 2 The density of airgel is 0.11g / cm 3 , the specific surface area is 162m 2 / g, CO at 20 and 50°C 2 The adsorption capacity was 3.2 and 2.7 mmol / g.

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Abstract

The invention relates to a novel amino hybrid SiO2 aerogel material and an application thereof. The novel amino hybrid SiO2 aerogel material is prepared by the method comprising the steps of firstly, uniformly mixing all reactants, and then putting the mixture into a drying oven for gelling; after aging of a wet gel, performing solvent replacement and supercritical drying to obtain an amino hybrid SiO2 aerogel, wherein the amino hybrid SiO2 aerogel can be used for CO2 adsorption. The obtained amino hybrid organic aerogel is subjected to CO2 adsorption application study. The method is simple in process and easy in industrial production, and the prepared material is large in adsorption capacity and good in selectivity to CO2 gas and has good circulating stability. The technology has an application value in the aspect of energy conservation and emission reduction.

Description

technical field [0001] The invention belongs to the development field of new materials and new applications thereof, and relates to a novel amino hybrid SiO 2 Airgel materials and applications, especially for CO 2 gas adsorption. Background technique [0002] Carbon dioxide is a major greenhouse gas that contributes to global warming. Therefore, efficient, large-scale capture of CO 2 The study of absorbents has attracted more and more attention. Currently used in industry for CO 2 The materials for gas adsorption are mainly liquid absorbents containing amino groups. Although the liquid absorbent has a high absorption capacity, it has disadvantages such as difficult desorption, high energy consumption, low absorption cycle efficiency, and serious secondary pollution. Therefore, solid absorbents have become the focus of current research, and the current research focus is mainly on porous solid materials, such as activated carbon, amino-modified mesoporous molecular sieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/291B01J20/30B01D53/02C01B33/16
CPCY02C20/40Y02P20/151
Inventor 沈晓冬孔勇崔升仲亚
Owner 江苏安珈新材料科技有限公司
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