XPS investigations of VPO catalysts under reaction conditions

E. Kleimenov, H. Bluhm, M. Hävecker, A. Knop-Gericke, A. Pestryakov, D. Teschner, J. A. Lopez-Sanchez, J. K. Bartley, G. J. Hutchings, R. Schlögl

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Abstract

The surface of vanadium phosphorus oxide (VPO) catalysts was investigated by (in situ) X-ray photoelectron spectroscopy (XPS) under reaction conditions. Two differently prepared VPO samples with similar catalytic activities showed different spectral behaviour while the catalytic conditions were changed. The vanadium surface oxidation state of both catalysts was found to have the same value close to 4 under reaction conditions, while the oxidation state of vanadium in deeper layers differed significantly. The experimental results suggest that in VPO the catalytically active species located in the topmost surface layers (up to 1 nm depth) are only weakly related to the structure of deeper layers. Based on our results we suggest that the deeper layers act as a substrate material only and can be different from the surface.

Original languageEnglish
Pages (from-to)181-188
Number of pages8
JournalSurface Science
Volume575
Issue number1-2
DOIs
Publication statusPublished - 20 Jan 2005

Keywords

  • Catalysis
  • Maleic anhydride
  • n-butane
  • Powders
  • Surface chemical reaction
  • Vanadium phosphorus oxide
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

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  • Cite this

    Kleimenov, E., Bluhm, H., Hävecker, M., Knop-Gericke, A., Pestryakov, A., Teschner, D., Lopez-Sanchez, J. A., Bartley, J. K., Hutchings, G. J., & Schlögl, R. (2005). XPS investigations of VPO catalysts under reaction conditions. Surface Science, 575(1-2), 181-188. https://doi.org/10.1016/j.susc.2004.11.021