An amine-functionalized strategy to enhance the CO2 absorption of type III porous liquids

Xingxing Zhao, Yudong Ding, Lijiao Ma, Xun Zhu, Hong Wang, Min Cheng and Qiang Liao

Energy, 2023, vol. 279, issue C

Abstract: Porous liquids (PLs) is a new material with two seemingly unrelated characteristics: porosity and liquidity. In this study, an amine functionalized strategy was proposed to enhance the CO2 absorption of Type III Porous Liquids. 2-Methylimidazole zinc salt (ZIF-8) modified by tetraethylenepentamine (TEPA) was chosen for providing porosities and the 1-Ethyl-3-methylimidazolium Bis(trifluoro-methanesulfonyl)-imide ([EMlm][NTf2]) was chosen as sterically hindered solvent, an amine-functionalized type Ⅲ porous liquids were reported. First, amine groups were successfully loaded on the ZIF-8. Then, the effect of amine loading on ZIF-8 was investigated. It was found the 30 TEPA@ZIF-8 nanoparticles were the optimum candidates based on CO2 absorption capacity and micropore analysis. Subsequently, the CO2 absorption capacity of absorbent was studied. 5-30TEPA@ZIF-8/[EMlm][NTf2] had a CO2 absorption capacity of 0.124 mmol g−1, which was 4.43 times higher than 5-0TEPA@ZIF-8/[EMlm][NTf2]. And the corresponding absorption rate increased by 745%. Three kinetics models were used for describing the absorption process, and the result showed the fractional-order kinetic model was the most accurate. Finally, the absorbent had a low heat absorption with a value of −1.38 kJ/mol. The CO2 absorption capacity lost just 4.3% after five cycles. All the results indicate the prepared porous liquids had an application potential in CO2 capture.

Keywords: Porous liquids; Amine-functionalized; ZIF-8; CO2 absorption kinetics; Absorption heat (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:279:y:2023:i:c:s0360544223013695

DOI: 10.1016/j.energy.2023.127975

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