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Effect of Co and Ce on silica supported manganese catalysts in the reactions of complete oxidation of n-hexane and ethyl acetate

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Abstract

Mono-component and bi-component catalysts, prepared by impregnation of silica with aqueous solution of Mn, Co, and Ce nitrates, were tested in the reactions of complete oxidation of n-hexane and ethyl acetate. The catalysts were characterized by powder X-ray diffraction, temperature-programmed reduction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The catalytic activity is significantly increased by the combination between manganese and cobalt, which is explained as a result of the high mobility of lattice oxygen, the simultaneous presence of Mn4+–Mn3+ couple, decrease in the strength of the Co–O bond, and the predominance of Co in the second oxidation state on the catalyst surface. The decrease in catalytic activity of Mn–Ce sample is attributed to the predominance of Ce on the surface and lower mobility of the lattice oxygen.

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Acknowledgements

A. Naydenov and G. Ivanov gratefully acknowledge the financial support by the National Science Fund of Bulgaria (National Centre for New Materials UNION, Contract No DO-02-82/2008).

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Authors and Affiliations

  1. Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bldg. 11, 1113, Sofia, Bulgaria

    S. Todorova, H. Kolev, K. Tenchev & G. Kadinov

  2. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bldg. 11, 1113, Sofia, Bulgaria

    A. Naydenov & G. Ivanov

Authors
  1. S. Todorova
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  2. A. Naydenov
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  3. H. Kolev
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  4. K. Tenchev
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  5. G. Ivanov
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  6. G. Kadinov
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Correspondence to S. Todorova.

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Todorova, S., Naydenov, A., Kolev, H. et al. Effect of Co and Ce on silica supported manganese catalysts in the reactions of complete oxidation of n-hexane and ethyl acetate. J Mater Sci 46, 7152–7159 (2011). https://doi.org/10.1007/s10853-011-5647-9

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  • DOI: https://doi.org/10.1007/s10853-011-5647-9

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