Reaction Gases O2, H2, CO

1 -n -butyl -3 -methyl -imidazolium 1 -n -butyl -3 -methyl -imidazolium 1 -n -butyl -3 -methyl -imidazolium 1 -n -butyl -3 -methyl -imidazolium 1 -n -butyl -3 -methyl -imidazolium 1 -n -butyl -3 -methyl -imidazolium 1 -n -butyl -3 -methyl -imidazolium 1-n-hexyl-3-methyl-imidazolium 1-n-hexyl-2,3-dimethyl-imidazolium 1-n-octyl-3-methyl-imidazolium 1 -n -butyl -3 -methyl -imidazolium 1 -n -butyl -3 -methyl -imidazolium 1-n-octyl-3-methyl-imidazolium 1-n-octyl-3-methyl-imidazolium 1 -n -butyl -3 -methyl -imidazolium l-ethyl-3-methyl-imidazolium 1 -n -butyl -pyridinium 1 -n -butyl -3 -methyl -imidazolium 1-n-hexyl-3-methyl-imidazolium trihexyltetradecylphosphonium 1 -n -butyl -3 -methyl -imidazolium 1 -n -butyl -3 -methyl -imidazolium 1 -n -butyl -3 -methyl -imidazolium 

N -trimethylbutylammonium l-ethyl-3-methyl-imidazolium l-n-hexyl-3-methyl-imidazolium l-n-butyl-3-methyl-imidazolium l-ethyl-3-methyl-imidazolium l-n-butyl-3-methyl-imidazolium l-n-hexyl-3-methyl-imidazolium trihexyl (tetradecyl) -phosphonium trihexyl (tetradecyl) -phosphonium 

Welton and coworkers used NMR spectroscopy to measure hydrogen solubility in a wide variety of ILs, the majority of which are imidazohum-based cations paired with anions such as [PFe], [BF4] , and Tf2N] [16,59]. Berger et al. [59] reported on the conversion and enantioselectivity of a hydrogenation reaction, as well as kinetic resolution by catalysts immobilized in the ILs. For these reactions, the H2 concentration in the ionic phase, rather than pressure in the gas phase, was the important kinetic parameter because the reaction occurred in the IL. For the ILs investigated in both studies, Henry s constants ranged from 0.7-7.2 x 10 bar. 

Light hydrocarbons such, as CH4, C2H4, and C2H6, have very limited published gas solubility data [30,34,36,38,64], No direct comparison between studies is possible, though close approximations between Camper et al. [36] and Anthony et al. [30] indicate that the results agree well. For example, the Henry s law constant for C2H4 in [BMIM][PFe] has been reported as 180 16 bar at 30 °C [36] and 144 2 bar at 25 °C [30], 

Water solubility is of particular interest as many ILs are hygroscopic and can absorb large quantities of water from atmospheric exposure. Measured water 

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