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<p>Various compositions of silica-supported manganese-copper mixed oxide catalysts were explored for the aerobic oxidation of cyclohexane with molecular oxygen as the oxidant. The investigated SiO<sub>2</sub>–MnO<sub>x</sub>–CuO catalysts with varying weight ratios were prepared by the wet-impregnation method. The prepared catalysts were characterized by various techniques such as XRD, XPS, N<sub>2</sub>-physisorption, SEM, and HR-TEM. Among the prepared catalysts, the SiO<sub>2</sub>-MnO<sub>x</sub>–CuO (SMC964) combination catalyst showed superior catalytic activity with 96% conversion and 96% allylic selectivity (85% selectivity to 2-cyclohexene-1-one and 11% selectivity to 2-cyclohexene-1-ol). Compared to pure metal oxides, the silica-supported mixed metal oxide catalysts demonstrated superior catalytic performance due to high surface area, mixed metal oxide nanoparticles forming on the support, and synergetic interaction between the metal oxides and the support. The influence of different reaction parameters, including the effect of solvent, temperature, reaction time, and catalyst amount, was systematically studied to optimize the reaction conditions. Furthermore, reusability tests over five cycles revealed excellent catalyst stability with negligible loss in activity.</p> Graphical Abstract <p></p>

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Selective Aerobic Oxidation of Cyclohexene with SiO2 Supported MnOx–CuO Mixed Oxide Catalysts

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Suleman,
  • Palnati Manojkumar,
  • Silligandla Nazeer,
  • Kamma Yogendra,
  • Pendem Chandrashekar,
  • Benjaram M. Reddy,
  • Tumula Venkateshwar Rao

摘要

Various compositions of silica-supported manganese-copper mixed oxide catalysts were explored for the aerobic oxidation of cyclohexane with molecular oxygen as the oxidant. The investigated SiO2–MnOx–CuO catalysts with varying weight ratios were prepared by the wet-impregnation method. The prepared catalysts were characterized by various techniques such as XRD, XPS, N2-physisorption, SEM, and HR-TEM. Among the prepared catalysts, the SiO2-MnOx–CuO (SMC964) combination catalyst showed superior catalytic activity with 96% conversion and 96% allylic selectivity (85% selectivity to 2-cyclohexene-1-one and 11% selectivity to 2-cyclohexene-1-ol). Compared to pure metal oxides, the silica-supported mixed metal oxide catalysts demonstrated superior catalytic performance due to high surface area, mixed metal oxide nanoparticles forming on the support, and synergetic interaction between the metal oxides and the support. The influence of different reaction parameters, including the effect of solvent, temperature, reaction time, and catalyst amount, was systematically studied to optimize the reaction conditions. Furthermore, reusability tests over five cycles revealed excellent catalyst stability with negligible loss in activity.

Graphical Abstract