CO2 absorption of anhydrous colloidal suspension based silica nanospheres with different microstructures

Yudong Ding, Liheng Guo, Xiaoqiang Li, Qiang Liao, Xun Zhu and Hong Wang

Energy & Environment, 2021, vol. 32, issue 8, 1437-1456

Abstract: Liquid absorption and solid adsorption technologies have been researched and reported widely for CO 2 capture. Combining the advantages of these two capture materials, a novel anhydrous colloidal suspension was synthesized by dispersing amine-modified microporous silica nanospheres in 2-[2-(dimethylamino) ethoxy] ethanol. In this study, solid, hollow, and porous silica nanospheres with different internal pore structures were synthesized and characterized. The effects of the silica nanosphere microstructures on diethylenetriamine loading and CO 2 absorption in anhydrous colloidal suspensions were studied. Due to a more developed pore structure, the hollow and porous silica-based absorbents possessed stronger amine loading capacities compared to solid silicon-based absorbent, and the best absorption performance was an absorption capacity of 1.2543 mmol/g at a pressure of 150 kPa and a temperature of 300 K. The results indicated that pore structure had a significant influence on the absorption property, and the porous silica-based absorbent was more favorable for CO 2 absorption than solid and hollow silica-based absorbents. Moreover, the pseudo-second-order model was successful in predicting the CO 2 absorption process in colloidal suspensions.

Keywords: CO2 absorption; colloidal suspension; silica nanospheres; diethylenetriamine-modified; microstructure (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:sae:engenv:v:32:y:2021:i:8:p:1437-1456

DOI: 10.1177/0958305X20943876

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