二氧化硅气凝胶的制备、氨基改性及低温吸附CO<sub>2</sub>性能研究进展

doi:10.11896/cldb.20120056

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Abstract With the aggravation of greenhouse effect, global warming and extreme weather emerge in endlessly,and efficient capture and storage of CO₂ become more and more imperative. At present, CO₂ capture technology mainly includes amine solution absorption and solid adsorption. Compared with the strong corrosiveness and environmental-unfriendly characteristics of the liquid absorption, the solid adsorbents have attracted wide attention due to their simple equipment requirements, low energy consumption and environmental friendliness properties. Among them, silica aerogel, with high specific surface area, high porosity, controllable pore size, easily modified surface, has aroused much interest in the field of CO₂ adsorption recently, which shows higher adsorption capacity of CO₂ than zeolites and activated carbons at low temperature.
There are two main factors affecting the CO₂ adsorption performance of silica aerogel. One is the structure characteristics of aerogel, including pore size, pore structure, specific surface area, porosity, etc. The other one is the number and distribution of functional groups on the surface of aerogel. Among them, the latter one plays a decisive role in the CO₂ adsorption property. A lot of studies have been carried out around the modification of silica aerogel. Currently, amino acid functionalization and nitrogen doping are used to introduce alkaline sites, which greatly improve the adsorption performance of SiO₂ aerogel to CO₂. However, the influence of the selection of organic amines and their carrying capacity, as well as the proportion of micropores /mesopores/ macropores in the adsorbent on the adsorption performance of CO₂ have not been clarified yet. Therefore, the design of pore structure of modified SiO₂ aerogel and the regulation of distribution of alkaline sites has become the key issue to further improve the adsorption property of CO₂. Meanwhile, improving adsorption rate, optimizing preparation process and reducing production cost are also the emphases of future research work.
In this paper, the influence of preparation technology of silica aerogel on its microstructure is reviewed, while the amino modification method of aerogel and the related adsorption mechanism during the adsorption process are concluded. In addition, the research progress of CO₂ adsorption by silica aerogel is summarized and the existing problems are pointed out, which provide scientific and practical reference for improving the adsorption performance of CO₂ on silica aerogel.

Key words： silica aerogel carbon dioxide adsorption amino modification adsorbent preparation method

Published: 10 August 2022 Online: 2022-08-15

CLC number:

TF19

Fund:Joint Fund Project of National Natural Science Foundation of China (U1810205).

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	FAN Lingyuan
	ZHANG Mei
	GUO Min

Cite this article:

FAN Lingyuan,ZHANG Mei,GUO Min. Preparation and Amino Modification of Silica Aerogel and Its Low Temperature Adsorption of CO₂: a Review[J]. Materials Reports, 2022, 36(15): 20120056-8.

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http://www.mater-rep.com/EN/10.11896/cldb.20120056 OR http://www.mater-rep.com/EN/Y2022/V36/I15/20120056

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