Abstract
Imidazolium bromide-based ionic liquids bearing phosphonyl groups on the cationic part were synthesized and grafted on γ-alumina (γ-Al2O3) powders. These powders were prepared as companion samples of conventional mesoporous γ-alumina membranes, in order to favor a possible transfer of the results to supported membrane materials, which could be used for CO2 separation applications. Effective grafting was demonstrated using energy dispersive X-ray spectrometry (EDX), N2 adsorption measurements, fourier transform infrared spectroscopy (FTIR), and special attention was paid to 31P and 13C solid state nuclear magnetic resonance spectroscopy (NMR).
Highlights
In competition with amines, ionic liquids are known to interact strongly and reversibly with CO2, making supported ionic liquid (IL) materials versatile solids for use in adsorptive or membrane CO2 separation applications [1]
One important outcome of this study bears on the possibility to perform the grafting with imidazolium bromide-based ILs bearing phosphonate functions (ImPE or ImTMSP) on γ-Al2O3 powders, either in dry methylene chloride solvent or in aqueous and alcoholic solvents
Compared to previous studies published in the literature describing the grafting of phenylphosphonic acid or its bis(trimethylsilyl)ester derivative, no bulk aluminum phosphonate phases were evidenced in the present work
Summary
Ionic liquids are known to interact strongly and reversibly with CO2, making supported ionic liquid (IL) materials versatile solids for use in adsorptive or membrane CO2 separation applications [1]. Imidazolium-based ILs grafted onto the surface of porous supports are promising systems for a range of applications, including catalysis [8,9], chromatography [10,11,12] and gas separation [13,14] These types of systems have been defined by Fehrmann et al [15], as supported ionic liquids (SILs), which refer to either inert or catalytically-active covalently-bound monolayers of ILs. These types of systems have been defined by Fehrmann et al [15], as supported ionic liquids (SILs), which refer to either inert or catalytically-active covalently-bound monolayers of ILs In these materials, the IL does not act like the bulk liquid anymore, but as a surface modifier. Ionic liquids can be grafted on mesoporous silica-based supports, such as MCM-41 [16] or SBA-15 [17], and they can be incorporated within a silica hybrid matrix [18]
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