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Journal of Materials Science

, Volume 46, Issue 22, pp 7152–7159 | Cite as

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

  • S. TodorovaEmail author
  • A. Naydenov
  • H. Kolev
  • K. Tenchev
  • G. Ivanov
  • G. Kadinov
Size Dependent Effects

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.

Keywords

CeO2 MnO2 Co3O4 Manganese Oxide Lattice Oxygen 

Notes

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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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • S. Todorova
    • 1
    Email author
  • A. Naydenov
    • 2
  • H. Kolev
    • 1
  • K. Tenchev
    • 1
  • G. Ivanov
    • 2
  • G. Kadinov
    • 1
  1. 1.Institute of CatalysisBulgarian Academy of SciencesSofiaBulgaria
  2. 2.Institute of General and Inorganic ChemistryBulgarian Academy of SciencesSofiaBulgaria

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