Reversible m ethyldiethanolamine ‐based deep eutectic solvents capture CO 2 : Experiments and molecular mechanisms

作者：Yan Hou, Yue Zhang, Shaohui Tao, Lili Wang, Xiaoyan Sun, Shuguang Xiang, Xia Li, Guoxuan Li · 发表于：AIChE Journal · 年份：2026 · DOI：10.1002/aic.70296 · 被引用次数：4 · 研究领域：Ionic liquids properties and applications、Carbon Dioxide Capture Technologies、Carbon dioxide utilization in catalysis

Abstract Methyldiethanolamine (MDEA), an efficient and environmentally friendly absorbent, has been widely used in CO 2 capture. This study prepared and evaluated two novel ternary MDEA‐based deep eutectic solvents (DES1 and DES2) for CO 2 capture performance. Experimental results show that the maximum CO 2 absorption capacities of DES1 and DES2 were 0.1237 and 0.1016 g CO 2 /g DES, with viscosities of 14 and 9.6 mPa s at 50 wt% water content. After five absorption–desorption cycles, DES1 maintained 82% of its initial absorption efficiency. Nuclear magnetic resonance analysis confirms the successful synthesis of DESs, which effectively absorb CO 2 . After regeneration, the structure remains unchanged despite chemical absorption, indicating the reversibility of MDEA‐based DESs. Molecular‐level analysis indicates that the DES1 capture CO 2 process involves physical absorption and chemical reactions. Specifically, ethanolamine reacts with CO 2 to form carbamate, and the interaction energy between CO 2 and MDEA is −2699.40 kJ/mol.