Equimolar CO(2) absorption by anion-functionalized ionic liquids.
Amino acid ionic liquid trihexyl(tetradecyl)phosphonium methioninate [P(66614)][Met] and prolinate [P(66614)][Pro] absorb CO(2) in nearly 1:1 stoichiometry, surpassing by up to a factor of 2 the CO(2) capture efficiency of previously reported ionic liquid and aqueous amine absorbants for CO(2). Room temperature isotherms are obtained by barometric measurements in an accurately calibrated stirred cell, and the product identity is confirmed using in situ IR. Density functional theory (DFT) calculations support the 1:1 reaction stoichiometry and predict reaction enthalpies in good agreement with calorimetric measurements and isotherms.
Gurkan
Burcu E
BE
Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA.
de la Fuente
Juan C
JC
Mindrup
Elaine M
EM
Ficke
Lindsay E
LE
Goodrich
Brett F
BF
Price
Erica A
EA
Schneider
William F
WF
Brennecke
Joan F
JF