Open AccessWater Effect on Acid-Gas Capture Using Choline Lactate: A DFT Insight beyond Molecule–Molecule Pair Simulations
Author(s) -
Gregorio García,
Mert Atilhan,
Santiago Aparício
Publication year - 2015
Publication title -
the journal of physical chemistry. b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 392
eISSN - 1520-6106
pISSN - 1520-5207
DOI - 10.1021/acs.jpcb.5b00184
Subject(s) - ionic liquid , molecule , chemistry , solubility , ionic bonding , sorbent , absorption (acoustics) , density functional theory , molecular dynamics , chemical physics , inorganic chemistry , computational chemistry , ion , organic chemistry , materials science , adsorption , composite material , catalysis
The suitability of CO2 and SO2 capture by using choline lactate ionic liquid as a sorbent and the effect of water content for acid-gas absorption were investigated through density functional theory (DFT) simulations in this work. Simulations that contain model systems considering up to four molecules (cholinium, lactate, water, and CO2/SO2) have been analyzed, and compositional effects on small cluster(s) formed by four ionic pairs and variable number of water molecules have been studied in this work. Assessment of the effect of water content on acid-gas capture that uses exotic ionic liquids is a rare study, and our results showed that water presence hinders CO2/SO2 affinity and solubility dramatically, mainly due to the dominated affinity between the ionic pair and water molecule rather than the CO2/SO2 molecule. Moreover, our studies also showed that affinity between ionic liquid and CO2 is hindered by more than ionic liquid and SO2 rich system with the presence of water in the environment.