Journal
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
Volume 56, Issue -, Pages 194-201Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2016.11.032
Keywords
Ionic liquids; Metal chelate; CO2 capture; Pyrazolide anion; Alkanolamine
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Funding
- National Natural Science Foundation of Zhejiang Province [LY14B060002]
- National Natural Science Foundation of China [21406140]
- China Postdoctoral Science Foundation [2015M571510]
- National Undergraduate Training Program for Innovation and Entrepreneurship [201510349016]
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Six dual functional ionic liquids (DFILs) with metal chelate cation and pyrazolide anion were synthesized by reacting alkanolamine with pyrazole sodium salt, and characterized by H-1 NMR, C-13 NMR, FT-IR, and ESI-MS spectra. Thermal decomposition temperature and viscosity were determined. The behavior of CO2 absorption for these DFILs was evaluated at T = 353.2 K. Absorption mechanism and the influence of temperature and N-2 on the CO2 absorption were investigated. The results show that the CO2 capacity of the DFILs consisting of alkanolamine with pyrazole sodium in a molar ratio of 2:1 is larger than that of the DFILs in a molar ratio of 1:1. The CO2 absorption mechanism obtained from FT-IR and C-13 NMR spectra indicates that CO2 could react with a quasi-aza-crown ether cation and pyrazolide anion simultaneously, resulting in improved capacity of CO2 absorption. According to the saturated CO2 absorption capacity at 333.2-363.2 K and van't Hoffs equation, the enthalpy of CO2 absorption for three DFILs is derived. Furthermore, the DFILs were carried out for five cycles with no obvious loss in the absorption capacity of CO2, indicating that these DFILs may be good candidates for efficient CO2 capture at relatively high temperature. (C) 2016 Elsevier Ltd. All rights reserved.
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