Journal
MOLECULAR CATALYSIS
Volume 447, Issue -, Pages 90-96Publisher
ELSEVIER
DOI: 10.1016/j.mcat.2018.01.006
Keywords
Aerobic oxidation; NHPI catalysis; Ionic liquid; Self-assemble; Hydrocarbons
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Funding
- National Basic Research Program of China (973 Program) [2015CB251401]
- National Natural Science Foundation of China [21476240]
- Instrument Developing Project of the Chinese Academy of Sciences [YZ201521]
- CAS (Chinese Academy of Sciences) 100-Talent Program
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW JSC011]
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A highly efficient and solvent-free system of cobalt/NHPI-catalyzed aerobic oxidation of hydrocarbons was developed using imidazolium-based ionic liquid (IL) as an additive. These amphipathic ILs were found self assemble at the interface between the organic hydrocarbons and the aqueous phase of catalyst combination (Co/NHPI), with forming a solution of reversed multilamellar vesicles for catalysis. The initial reaction rate was influenced by both the composition of microdomains and the structure of IL launched. Consequently, a proper water content (x(H2O)) of wet IL was requisite to reach the optimum reactivity. Besides, the interfacial boundary between aqueous and organic phase composed by C2-alkylated imidazolium ILs, such as [bdmim]SbF6 and [C(12)dmim]SbF6, not only has ternary aggregates (hydrocarbons/IL/H2O) of higher stability but renders O-2 a faster diffusion rate and higher concentration, thereby offering a high reactivity of the protocol towards hydrocarbon oxidation.
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