Journal
JOURNAL OF CO2 UTILIZATION
Volume 33, Issue -, Pages 419-426Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2019.07.017
Keywords
CO2 conversion; Cyclic carbonate; Deep eutectic solvent; Hydrogen bond; Activation
Funding
- National Natural Science Foundation of China [21805154, 51673106]
- Natural Science Foundation of Shandong Province [ZR2018BB009]
- Project of Shandong Province Higher Educational Science and Technology Program [J18KA065]
- China Postdoctoral Science Foundation [2019M652343]
- Opening Project of Shandong Eco-chemical Engineering Collaborative Innovation Center [XTCXQN01]
- Scientific Research Foundation of Qingdao University of Science and Technology [0100229019]
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Novel N-hydroxysuccinimide (NHS) based deep eutectic solvents (DESs) were facilely synthesized and structurally characterized by FT-IR, NMR and TGA techniques. The NHS-based DESs were demonstrated as a promising platform for efficient conversion of CO2 into cyclic carbonate. The optimized DES, i.e. iodide choline (ChI)/NHS with molar ratio of 1:2 exhibited excellent catalytic performance at 30 degrees C and 1.0 MPa CO2 pressure in the absence of cocatalyst, metal and solvent. The catalytic behaviour, catalyst recyclability and versatility were studied in details. The hydrogen-bond interaction between the ChI/NHS and substrate were also investigated. Based on the results, an insight into the synergetic catalytic mechanism involving hydrogen bond activation and ring-opening of epoxide was proposed. Compared with the reported DESs media, the NHS-based DESs present the higher-efficiency and greater advance in the synthesis of cyclic carbonate under ambient conditions.
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