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Ionic liquids: magic reagents for refining multifunctional lanthanum manganese mixed nanoparticles in cyclohexane selective oxidation
Selective oxidation of alkanes to produce high value chemicals is an essential strategy and means to realize efficient utilization of resources. In this work, multifunctional lanthanum manganese mixed metal oxides (LMMO) were successfully refined by the introduction of ionic liquids (ILs) in the alchemy furnace. The refined multifunctional LMMO catalysts exhibited excellent catalytic performance (8.9% cyclohexane conversion with 90% KA oil selectivity) in the selective aerobic oxidation of cyclohexane. The effects of anion type, carbon chain length and concentration of ILs on the structure and properties of the catalysts were investigated through various characterizations, indicating the structure-directing and template effect of ILs on the multifunctional catalysts. Importantly, the high reactive oxygen concentration, redox capacity, and suitable basic sites of LMMO catalysts were achieved with the assistance of magic ILs in alchemy furnace, which enhances the activation of C-H bonds and molecular oxygen, simultaneously influencing the adsorption and desorption of the substrate. In addition, the high KA oil selectivity and radical reaction mechanism was investigated in detail. This work provides an efficient way to construct catalytic active centers via ILs, and this strategy can be extended to various reactions.
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