Energy-Efficient CO 2 Desorption of Ionic Liquid Solvents Facilitated by Homogeneous Lewis Acid Catalysts

作者：Haozhan Chu, Guoxiong Zhan, Kuilin Peng, Yinge Bai, Pengfei Gao, Hongyu Zhang, Zehua Wei, Xiangping Zhang, Shaojuan Zeng · 发表于：ACS Sustainable Chemistry & Engineering · 年份：2025 · DOI：10.1021/acssuschemeng.5c08929 · 被引用次数：8 · 研究领域：Carbon Dioxide Capture Technologies、Phase Equilibria and Thermodynamics、Ionic liquids properties and applications

Ionic liquids (ILs) show great potential for carbon dioxide (CO 2 ) capture due to their designable structures and dual roles as absorbents and catalysts. Our previously designed IL solvent ([Cho][Triz]/TMS) showed good absorption performance but a slow regeneration rate. Here, a novel strategy to promote CO 2 desorption in IL absorbents at lower temperatures using homogeneous Lewis acid IL (LAIL) catalysts was proposed. The cobalt (Co)-based LAIL [Bmim] 2 [CoCl 4 ] exhibited superior performance, with the CO 2 desorption amount enhanced by 54.1% and activation energy reduced by 30.3% compared with the blank test, leading to low regeneration energy consumption (0.90 GJ/t CO 2 ), which was ascribed to a simultaneous increase in Brønsted and Lewis acid sites, promoting C–N bond cleavage by C2–H in [Bmim] 2 2+ and Co sites in [CoCl 4 ] 2– . The environmental impact of IL-based CO 2 capture processes, evaluated by the green degree method, demonstrated that the green degree production value of the IL-LAIL system is 79.6 and 673.6 gd/h higher than that of the IL and MEA systems, respectively, indicating greater environmental sustainability. This study provides a viable strategy for employing homogeneous catalysts to facilitate energy-efficient CO 2 capture.