Abstract
A novel 1-Butyl-3-methylimidazolium chloride (BmimCl)-based ternary deep eutectic solvents system was developed and employed to convert CO2 into cyclic carbonates under mild conditions. Fourier transform infrared spectroscopy (FT-IR), proton nuclear magnetic resonance spectroscopy (1H NMR), thermogravimetric and differential thermal analyses (TG-DTA) were used to character the DESs. Besides, the impacts of reaction parameters and substrate ranges on cycloaddition reaction were also investigated. Under the optimized reaction conditions, the yield of propylene carbonate (PC) was about 98.0 % over BmimCl/Boric acid (BA)/Glutaric acid (GA) (7/1/1, molar ratio). In addition, the BmimCl-based ternary DESs are easy to recycle and indicates excellent reusability. The mechanism of epoxide activated by hydrogen bonds and epoxide ring opening was proposed. The BmimCl-based ternary DESs will be viewed as an innovative system for cycloaddition of CO2 with epoxides and it will supply a novel class of DESs for other possible applications.
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