Abstract
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 1H NMR, 13C 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=353.2K. Absorption mechanism and the influence of temperature and N2 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 13C 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 333.2–363.2K and van’t Hoff’s 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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.