Supported Ionic Liquid Catalysis

Abstract

Supported ionic liquid catalysis is a concept which combines the advantages of ionic liquids with those of heterogeneous support materials. The viability of this concept has been confirmed by several studies which have successfully confined various ionic phases to the surface of support materials and explored their potential catalytic applications. Although the majority of the evaluated supports were silica based, several studies focused on polymeric materials including membranes. The preparation of these materials was achieved by using two different immobilization approaches. The first approach involves the covalent attachment of ionic liquids to the support surface whereas the second simply deposits the ionic liquid phases containing catalytically active species on the surface of the support. Herein recent advances made in this area are described.

High Ionic Liquid Content Polymeric Gel Membranes: Preparation and Performance

“…12 Kawauchi et al reported thermoreversible ion gels based on poly(methyl methacrylate)s in 1-butyl-3-methylbenzimidazolium hexafluorophosphate. 13 The supported liquid membranes have been tested for targeted gas/gas separations and especially for separation from air of volatile organic compounds, 14,15 leaking from gasoline during its storage, transportation and handling. In comparison with frequently used polymers like polydimethylsiloxane (PDMS), [16][17][18] polyether-polyamide block copolymer (PEBA), poly(vinylidene fluoride) (PVDF), highfree volume amorphous glassy perfluoropolymers, 19 or cross-linked fluorinated or poly(amide-imide) polymers, 20,21 RTIL supported membranes are, highly absorbing for alkanes and aromates without enormous material swelling.…”

Effect of immobilization of titanocene catalyst in aralkyl imidazolium chloroaluminate media on performance of biphasic ethylene polymerization and polyethylene properties

“…However, they reveal greater thermal stability than analogues with alkyl side chain [40]. It should be noted that the ionic liquids with an aralkyl substituent could potentially be suitable for the heterogenization of an organometallic catalyst on a solid carrier in the supported ionic liquids phase (SILP) method, which appears to be an another promising method for the catalyst immobilization [41,42].…”

Preparation of IL-loaded microreactors based on polyelectrolyte microcapsules

“…Besides, it reduces the cost of the process since a smaller amount of IL is employed to perform a reaction [14][15][16][17]. A first method to immobilize ILs consists in impregnating a solid substrate on which IL forms a thin adsorbed layer.…”