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Highly Dispersed MnOx Nanoparticles on Shape-Controlled SiO2 Spheres for Ecofriendly Selective Allylic Oxidation of Cyclohexene

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Abstract

Shape-controlled metal nanomaterials are considered as a unique class of catalysts because of their synergistic size- and shape-dependent catalytic properties. This work reports the synthesis of a novel size- and shape-controlled catalyst, consisting of highly dispersed MnOx nanoparticles (average particle size of 4.5 nm) on shape-controlled SiO2 nanospheres (250–300 nm) for selective cyclohexene oxidation using air as the oxidant under solvent- and base-free conditions. The MnOx/SiO2 catalyst exhibited an excellent cyclohexene conversion (~ 92%) with a high selectivity (~ 96%) to the allylic products (2-cyclohexene-ol and 2-cyclohexene-one) under mild conditions, outperforming various SiO2 supported CoOx, FeOx, and CuOx catalysts. The better performance of shape-controlled MnOx/SiO2 nanocatalyst is due to high redox nature of Mn, uniform dispersion of smaller sized MnOx nanoparticles, and synergetic interaction between MnOx and SiO2 spheres, as evidenced by XPS and TEM studies. Further, the MnOx/SiO2 catalyst could be reused at least 5 times for selective cyclohexene oxidation with a negligible loss in its catalytic performance, indicating the excellent stability of shape-controlled metal nanocatalysts in organic synthesis under economically viable and mild conditions.

Graphic Abstract

Shape-controlled MnOx/SiO2 nanocatalyst shows an excellent catalytic activity and a high selectivity to allylic products in the oxidation of cyclohexene under mild conditions

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Acknowledgements

BG thanks the Council of Scientific and Industrial Research (CSIR), New Delhi for research fellowships. BMR thanks the DAE, Mumbai for the award of Dr Raja Ramanna Fellowship. The authors duly acknowledge the RMIT Microscopy and Microanalysis Facility (RMMF) for providing access to their instruments used in this study.

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Authors and Affiliations

  1. Catalysis and Fine Chemicals Department, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad, 500 007, India

    Bolla Govinda Rao, Tumula Venkateshwar Rao & Benjaram M. Reddy

  2. Centre for Advanced Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, GPO BOX 2476, Melbourne, VIC, 3001, Australia

    Putla Sudarsanam, Mohamad Hassan Amin & Suresh K. Bhargava

  3. Catalysis and Inorganic Chemistry Division, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune, 411008, India

    Putla Sudarsanam

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  1. Bolla Govinda Rao
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  6. Benjaram M. Reddy
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Correspondence to Benjaram M. Reddy.

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Rao, B.G., Sudarsanam, P., Rao, T.V. et al. Highly Dispersed MnOx Nanoparticles on Shape-Controlled SiO2 Spheres for Ecofriendly Selective Allylic Oxidation of Cyclohexene. Catal Lett 150, 3023–3035 (2020). https://doi.org/10.1007/s10562-020-03205-z

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