Open AccessInvestigations of 1-(4-propylamino)-3-ethyl imidazolium tetrafluoroborate ionic liquid capturing CO2
Author(s) -
Lijuan Yang,
Yuwei Zhao,
Wei Sun
Publication year - 2013
Publication title -
journal of the serbian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 45
eISSN - 1820-7421
pISSN - 0352-5139
DOI - 10.2298/jsc121018120y
Subject(s) - ionic liquid , tetrafluoroborate , interaction energy , ion , hydrogen bond , chemistry , dispersion (optics) , ionic bonding , materials science , chemical physics , computational chemistry , molecule , organic chemistry , physics , catalysis , optics
1-(4-propylamino)-3-ethyl imidazolium ([Paeim]+) Tetrafluoroborate([BF4]-) Ionic liquid (IL), capturing CO2, was explored systematically at B3LYP/6-311++G** and mp2/6-311++G** level. The stable geometries of ILs and capture products were optimized, the energies of these geometries were obtained and corrected by Zero-point-vibration-energy and basis set superposition error correction. The results show that the interactions between [Paeim]+and [BF4]-are mainly displayed as hydrogen bonds, but the interaction energies exceeds -328 kJ/mol. Further analysis found that the interactions are reinforced by charge dispersion and charge redistribution of ion-pair, and that electrostatic attraction contributes much to the interaction energies. This IL system capturing CO2belongs to the class of physical sorption with 1:1 molar absorption ratio, the absorption energy is nearly -18kJ/moland thus this IL may have low energy consumption when regenerated from IL-CO2