Journal
JOURNAL OF SURFACTANTS AND DETERGENTS
Volume 24, Issue 1, Pages 185-190Publisher
WILEY
DOI: 10.1002/jsde.12451
Keywords
Surface-active ionic liquid; Mixed micelles; Molar solubilization ratio; Partition coefficient; Catalytic oxidation of toluene; Micellar catalysis
Funding
- University Grant Commission (UGC), India
- Department of Atomic Energy (DAE)
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Ionic liquids can be tuned to resemble amphiphiles, forming surface-active ionic liquids that exhibit synergistic micellization when mixed with conventional surfactants. This study focuses on the application of mixed micelles of [C(14)mim]Br and OPE-10 in catalytic oxidation reactions, showing enhanced solubilization and selective catalytic oxidation of toluene.
Ionic liquids have been found to be suitable alternatives to volatile organic solvents in chemical transformation. Through a proper choice of cations and anions, the properties of an ionic liquid can be tuned so that it resembles an amphiphile. Such specially designed molecules are known as surface-active ionic liquids (SAIL). Like conventional surfactants, SAIL also form aggregates in an aqueous medium. Studies show that the mixing of SAIL with conventional surfactants leads to synergistic micellization. However, very few reports are available on the application of such systems as reaction media. Present study focuses on the application of mixed micelles of 1-tetradecyl-3-methylimidazol-1-ium bromide, ([C(14)mim]Br) with nonionic surfactant, Octylphenol ethoxylate with 10 moles of ethylene oxide (OPE-10). Enhanced solubilization and selective catalytic oxidation of toluene using hydrogen peroxide as an oxidant and tungstic acid as a catalyst have been studied in detail using this system.
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