6 research outputs found
Thermodynamics of imidazolium based ionic liquids with cyano containing anions
© 2017 Elsevier B.V. Thermochemical investigation of the series of 1-alkyl-3-methylimidazolium ionic liquids with B(CN) 4 and PF 2 (CN) 4 anions is presented. Absolute vapor pressures and vaporization enthalpies have been measured by using quartz-crystal microbalance. Gas-phase enthalpies of formation of ILs were calculated by using the high-level quantum-chemical method G3MP2. From a combination of experimental and theoretical results, the enthalpy of formation of aqueous B(CN) 4 ion was derived for the first time
Thermodynamics of imidazolium based ionic liquids with cyano containing anions
© 2017 Elsevier B.V. Thermochemical investigation of the series of 1-alkyl-3-methylimidazolium ionic liquids with B(CN) 4 and PF 2 (CN) 4 anions is presented. Absolute vapor pressures and vaporization enthalpies have been measured by using quartz-crystal microbalance. Gas-phase enthalpies of formation of ILs were calculated by using the high-level quantum-chemical method G3MP2. From a combination of experimental and theoretical results, the enthalpy of formation of aqueous B(CN) 4 ion was derived for the first time
Thermodynamics of imidazolium based ionic liquids with cyano containing anions
© 2017 Elsevier B.V. Thermochemical investigation of the series of 1-alkyl-3-methylimidazolium ionic liquids with B(CN) 4 and PF 2 (CN) 4 anions is presented. Absolute vapor pressures and vaporization enthalpies have been measured by using quartz-crystal microbalance. Gas-phase enthalpies of formation of ILs were calculated by using the high-level quantum-chemical method G3MP2. From a combination of experimental and theoretical results, the enthalpy of formation of aqueous B(CN) 4 ion was derived for the first time
Thermodynamics of imidazolium based ionic liquids with cyano containing anions
© 2017 Elsevier B.V. Thermochemical investigation of the series of 1-alkyl-3-methylimidazolium ionic liquids with B(CN) 4 and PF 2 (CN) 4 anions is presented. Absolute vapor pressures and vaporization enthalpies have been measured by using quartz-crystal microbalance. Gas-phase enthalpies of formation of ILs were calculated by using the high-level quantum-chemical method G3MP2. From a combination of experimental and theoretical results, the enthalpy of formation of aqueous B(CN) 4 ion was derived for the first time
Novel Inverse Supported Ionic Liquid Absorbents for Acidic Gas Removal from Flue Gas
This
work reports on the astonishing high capacity of inverse supported
ionic liquid absorbents, hereinafter denoted as “inverse SILPs”
to remove acidic gases (SO<sub>2</sub> and CO<sub>2</sub>) from flue
gas streams. These nonconventional SILPs are easily prepared in the
form of flowing powder via a phase inversion technique and consist
of tiny ionic liquid (IL) droplets enclosed into an ultrathin, porous
solid sleeve of pyrogenic silica nanoparticles. The CO<sub>2</sub>/N<sub>2</sub> and SO<sub>2</sub>/CO<sub>2</sub> separation performance
and regeneration efficiency of inverse SILPs developed from six different
ILs and two IL/chitosan ionogels was examined via gravimetric CO<sub>2</sub>, N<sub>2</sub> absorption isotherms and via SO<sub>2</sub>, CO<sub>2</sub>, O<sub>2</sub> breakthrough curves from gas mixtures
in fixed beds. The involved ILs varied from chemisorbing ones, composed
of alkyl- or alkanol-ammonium cations and amino acid anions, to physisorbing
ones including ether functionalized anions and 1-alkyl-3-methylimidazolium
cations. It is noteworthy that the best performing inverse SILP consisted
of a very common IL, the 1-butyl-3-methylimidazolium chloride [BMIM]Â[Cl],
the absorption capacity of which was slightly enhanced by dissolving
5 wt % of chitosan to form the respective ionogel. The material’s
performance was stable in repeated cycles of absorption and regeneration
at 60 °C under helium flow, exhibiting SO<sub>2</sub>/CO<sub>2</sub> selectivity of above 300, while the SO<sub>2</sub> and CO<sub>2</sub> absorption capacity was 1.6 and 0.6 mmol/g respectively at
25 °C, in a gas stream of 1 bar composed of 0.13 vol % SO<sub>2</sub>, 13 vol % CO<sub>2</sub>, 11.5 vol % O<sub>2</sub> and N<sub>2</sub> (balance)