Journal
JOURNAL OF CO2 UTILIZATION
Volume 16, Issue -, Pages 384-390Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2016.10.004
Keywords
Triethanolamine; Protonation; CO2 conversion; Epoxide; Cyclic carbonate
Funding
- National Natural Science Foundation of China [21373069, 21673060]
- Fund for Research and Development of Science and Technology in Shenzhen [JCYJ20160427184531017, ZDSYS201603301417588]
- State Key Lab of Urban Water Resource and Environment of Harbin Institute of Technology [HIT2015DX08]
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The protonated triethanolamine salts with multiple hydrogen bond donor groups were one-step prepared and demonstrated to be simple, environmentally benign and highly efficient catalyst for the chemical fixation of carbon dioxide to cyclic carbonates under mild reaction conditions without additional cocatalyst and organic solvent participation. Hydrogen-bonding activation towards epoxide is a special class of mimetic alternative to Lewis acid activation for favor of opening the epoxy ring, which was recognized as the rate-determining step for the CO2 cycloaddition reaction. Here the effects of reaction parameters on catalytic activity for propylene carbonate (PC) synthesis from propylene oxide (PO) and CO2 were investigated thoroughly. With 0.65 mmol (1.88 mol%) catalyst loading, 91% PC yield with 99% selectivity were obtained at 110 degrees C and 2.0 MPa for 6.0 h. The [HTEA]I catalyst could be easily separated and regenerated from the reaction products for subsequent reuse, also displayed versatility to CO2 cycloaddition with other epoxides. Additionally, the possible synergistic catalytic mechanism deriving from cation and anion of protonated triethanolamine catalyst was proposed. (C) 2016 Elsevier Ltd. All rights reserved.
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