New experimental results are presented for the solubility of hydrogen in the ionic liquid 1- N -butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF 6 ]) for temperatures from 313 K to 373 K and pressures up to about 9 MPa. The extended Henry's law is applied to correlate the solubility pressures. The solubility of H 2 in [bmim][PF 6 ] is low and increases slightly with temperature. For example, at T ≈ 313 K (373 K) and p ≈ 9 MPa, only about 0.078 mol (0.106 mol) of the gas is dissolved in 1 kg of the ionic liquid.
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Kumełan et al. (2005) studied this question.