This work reports the interaction study of two supported ionic liquid membranes (SILMs) based on 1-butyl-3-methylimidazolium hexafluorophosphate ([C 4 mim][PF 6 ]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([C 4 mim][BF 4 ]), which were impregnated into porous zirconia supports with 20 nm average pore diameters. The interaction of ionic liquid-support observed from diffuse reflectance (DR), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy and energy dispersive spectroscopy (SEM/EDS) is reported. The IR spectrum in the 600 to 4000 cm −1 range showed a specific interaction of the ionic liquid with the support. The N 2 and CO 2 permeances in the SILMs with [C 4 mim][BF 4 ] were 8.7 × 10 −8 mol·s −1 ·m −2 ·Pa −1 and 9.6 × 10 −7 mol·s −1 ·m −2 ·Pa −1 , respectively. The separation factor through the ionic liquid in the membrane as a function of temperature showed that the SILMs studied here can be used for CO 2 separation at low temperatures.
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