Abstract
Carbon-supported ferric oxide nanoparticles (Fe2O3 NPs) were constructed via directly carbonizing mesoporous poly(ionic liquid) with [Fe(CN)6]3– anions, which was prepared through the free-radical self-polymerization of ionic liquid monomer 1-allyl-3-vinylimidazolium chloride in a soft-template route and successive ion exchange with potassium ferricyanide. The unique mesoporous ionic networks enabled the molecular dispersion of ferric precursors and therefore resulted in highly dispersed Fe2O3 NPs on carbon. The catalyst exhibited high yield, remarkable turnover number, and good reusability in the reductant-free aerobic oxidation of benzene to phenol with O2. The synergistic effect of Fe2O3 NPs and carbon accounted for the high performance. This work delivered the first efficient and environmentally friendly heterogeneous catalyst for reductant-free benzene hydroxylation with O2.
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