N‑Hydroxyphthalimide Dissolved in Ionic Liquids Supported on Carbon Nanotubes as a Hybrid Catalytic System for Solvent-Free Aerobic Oxidation of Ethylbenzene
Shakir Ul Azam, Beata Orlińska, Kamil Peckh
TL;DR
Researchers developed a new hybrid catalytic system using carbon nanotubes and ionic liquids to efficiently oxidize ethylbenzene without solvents.
Contribution
A novel SILP and SCILL-SILP hybrid catalytic system using carbon nanotubes and ionic liquids for solvent-free ethylbenzene oxidation is introduced.
Findings
The [bmim][Cl]-based SILP system achieved 12.2% ethylbenzene conversion with 84.1% selectivity toward acetophenone.
The [bmim][NTf2]-based SCILL-SILP system reached 22.6% ethylbenzene conversion.
The [bmim][OcOSO3]-based systems showed relative stability across multiple cycles.
Abstract
Carbon nanotubes have gained significant interest in catalysis (as catalysts and catalyst supports) for hydrocarbon oxidation processes. In this study, pristine multiwalled carbon nanotubes and copper(II) functionalized multiwalled carbon nanotubes were coated with [bmim] cationic ionic liquids (ILs) containing dissolved N-hydroxyphthalimide (NHPI) to produce novel SILP and SCILL-SILP hybrid catalytic systems, respectively (SILP: supported ionic liquid phase and SCILL: solid catalyst with an ionic liquid layer). The catalytic activities of the produced systems were investigated for the solvent-free oxidation of ethylbenzene (EB) (80 °C, 0.1 MPa, 6 h) using molecular oxygen as a green oxidant. Among the SILP systems, the 1-butyl-3-methylimidazolium chloride ([bmim][Cl])-based SILP system exhibited the highest conversion of EB (12.2 ± 3.1%) with enhanced selectivity (84.1 ± 11.4%)…
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Taxonomy
TopicsOxidative Organic Chemistry Reactions · Catalysis and Oxidation Reactions · Ionic liquids properties and applications