Premium
Supported Absorption of CO 2 by Tetrabutylphosphonium Amino Acid Ionic Liquids
Author(s) -
Zhang Jianmin,
Zhang Suojiang,
Dong Kun,
Zhang Yanqiang,
Shen Youqing,
Lv Xingmei
Publication year - 2006
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200501015
Subject(s) - ionic liquid , chemistry , absorption (acoustics) , desorption , inorganic chemistry , ionic bonding , organic chemistry , adsorption , ion , materials science , catalysis , composite material
A new type of “task specific ionic liquid”, tetrabutylphosphonium amino acid [P(C 4 ) 4 ][AA], was synthesized by the reaction of tetrabutylphosphonium hydroxide [P(C 4 ) 4 ][OH] with amino acids, including glycine, L ‐alanine, L ‐β‐alanine, L ‐serine, and L ‐lysine. The liquids produced were characterized by NMR, IR spectroscopies, and elemental analysis, and their thermal decomposition temperature, glass transition temperature, electrical conductivity, density, and viscosity were recorded in detail. The [P(C 4 ) 4 ][AA] supported on porous silica gel effected fast and reversible CO 2 absorption when compared with bubbling CO 2 into the bulk of the ionic liquid. No changes in absorption capacity and kinetics were found after four cycles of absorption/desorption. The CO 2 absorption capacity at equilibrium was 50 mol % of the ionic liquids. In the presence of water (1 wt %), the ionic liquids could absorb equimolar amounts of CO 2 . The CO 2 absorption mechanisms of the ionic liquids with and without water were different.