Ternary Deep Eutectic Solvents Tasked for Carbon Dioxide Capture

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• 作者：Leonhard L. Sze ; Shubha Pandey ; Sudhir Ravula ; Siddharth Pandey ; Hua Zhao ; Gary A. Baker ; Sheila N. Baker
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2014
• 出版时间：September 2, 2014
• 年：2014
• 卷：2
• 期：9
• 页码：2117-2123
• 全文大小：303K
• ISSN：2168-0485

文摘

Task-specific ternary deep eutectic solvent (DES) systems comprising choline chloride, glycerol, and one of three different superbases were investigated for their ability to capture and release carbon dioxide on demand. The highest-performing systems were found to capture CO₂ at a capacity of 鈭?0% by weight, equivalent to 2.3鈥?.4 mmol of CO₂ captured per gram of DES sorbent. Of the superbases studied, 1,5-diazabicyclo[4.3.0]-non-5-ene (DBN) gave the best overall performance in terms of CO₂ capture capacity, facility of release, and low sorbent cost. Interestingly, we found that only a fraction of the theoretical CO₂ capture potential of the system was utilized, offering potential pathways forward for further design and optimization of superbase-derived DES systems for further improved reversible CO₂ sequestration. Finally, the shear rate-dependent viscosities indicate non-Newtonian behavior which, when coupled to the competitive CO₂ capture performance of these task-specific DESs despite a 1 to 2 orders of magnitude higher viscosity, suggest that the Stokes鈥揈instein鈥揇ebye relation may not be a valid predictor of performance for these structurally and dynamically complex fluids.

Keywords:

Carbon dioxide capture; Deep eutectic solvent; DES; CO₂ sequestration; 1,5-Diazabicyclo[4.3.0]-non-5-ene (DBN)