Solubility of H₂ in the Ionic Liquid [bmim][PF₆]

Abstract

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.

Solubility and diffusivity of H2 and CO2 in the ionic liquid [bmim][PF6]

“…A similar trend is observed (see Table 2) by our K H2 values. The K H2 values reported by Kumelan et al [35] (see Table 2) are substantially higher than our results and those of Jacquemin et al [31]. Moreover, their K H2 values decrease as the temperature increases from 40 C to 100 C, which is counterintuitive, and also contrasts the observed trends in our own data and those of Jacquemin et al [31].…”

“…For CO 2 , Anthony et al [9] reported DH CO 2 ¼ À16.1 kJ/mol which is in a good agreement (within 2.5%) with the value determined in our work. For H 2 , Kumelan et al [35] found DH H 2 ¼ À4.9 kJ/ mol, 30% smaller than the value obtained in this work, mostly due to the difference in the measurement techniques used in the two studies. The diffusivities for both H 2 and CO 2, when measured under isothermal conditions, indicate no dependence on pressure, as noted previously (see Fig.…”

“…The Henry's constant for CO 2 , K CO2 (MPa), is calculated from the regression of the solubility data. Table 1 summaries the results for the K CO2 measured in this work, as well as other corresponding values reported in the literature [9,30,31,35,40]. It is evident from Table 1 6 ], as well as the corresponding Henry's constants are summarized in Table 2, which also presents the Henry's constants reported by i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y 4 0 ( 2 0 1 5 ) 8 7 1 3 e8 7 2 0 previous investigators.…”

Solubilities of ammonia in basic imidazolium ionic liquids

“…In recent years, room temperature ionic liquids (RTILs) are showing more and more promising perspectives in industrial waste gases' separation, such as CO 2 [2][3][4][5], SO 2 [6,7], CO [8], H 2 [9] and so on. Due to their favorable properties [10][11][12][13][14], such as wide liquid range, low vapor pressures, high thermal stability, excellent solubility for both polar and nonpolar organic and inorganic substances, using ILs to capture ammonia has attracted much attention recently.…”

Pd Nanoparticles in a Supported Ionic Liquid Phase: Highly Stable Catalysts for Selective Acetylene Hydrogenation under Continuous-Flow Conditions

“…With increasing temperature, the hydrocarbon solubility decreases 39 (as confirmed by NMR spectroscopy) while the hydrogen solubility increases. 49 Since the reaction rate seems to be controlled by the hydrogen surface concentration, the overall specific reaction rate increases (Table 2). At the same time, the solubility of acetylene diminishes with increasing temperature, but to a lesser extent than ethylene and ethane.…”