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Russian Journal of Physical Chemistry B

, Volume 7, Issue 8, pp 924–931 | Cite as

The effect of clustering of VO2+ ions in sub- and supercritical water. An in situ EPR study

  • S. N. Trukhan
  • V. F. Yudanov
  • O. N. Mart’yanov
Article

Abstract

Temperature variations of the EPR spectra of VO2+ ions in sub- and supercritical water under isothermal and temperature gradient conditions are investigated using an in situ EPR. Broadening of the hyperfine structure at increasing temperature and the appearance of an unresolved broad low-intensity line (ΔH pp ≈ 300 Oe) in the supercritical state are observed in the absence of temperature gradients, indicating an increase of exchange interaction between VO2+ ions in supercritical water. An exchange-narrowed anisotropic absorption line is observed under the temperature-gradient conditions in the subcritical water near the transition to a supercritical state. The shape of this line is close to that observed in the solid salt VOSO4 · 3H2O. It is shown that in situ EPR allows us to investigate the effects of changing the local environment of paramagnetic ions, which precedes the well-known process of clustering and formation of amorphous oxide particles in sub- and supercritical conditions.

Keywords

ESR supercritical water in situ spectroscopy VO2+ VOSO4 clustering heterogeneous catalyst temperature gradient 

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Copyright information

© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • S. N. Trukhan
    • 1
  • V. F. Yudanov
    • 1
  • O. N. Mart’yanov
    • 1
  1. 1.Boreskov Institute of CatalysisRussian Academy of Sciences, Siberian BranchNovosibirskRussia

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