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      Spectroscopic characterization of vanadium(v) oxo species deposited on zirconia

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      Author(s)
      Kantcheva, M.
      Date
      2000
      Source Title
      Physical Chemistry Chemical Physics
      Print ISSN
      1463-9076
      Publisher
      Royal Society of Chemistry
      Volume
      2
      Issue
      13
      Pages
      3043 - 3048
      Language
      English
      Type
      Article
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      Abstract
      A method for deposition of vanadium(v) oxo species from acidic solutions of ammonium metavanadate on zirconia is described. The samples are synthesized by suspension of the support (powder) in solutions containing three different vanadium(V) precursor ions: the dioxovanadium(V) ion, VO2+, the yellow diperoxo anion [VO(O-O)2]- and the red monoperoxo cation [VO(O- O)]+. Application of vanadium(V) peroxo complexes increases significantly the uptake of vanadium by zirconia. The state and localization of the VO(x) species on the surface of zirconia were studied by FTIR, UV/VIS and XP spectroscopies. The materials prepared from VO2+ ions contain isolated VO4 groups and domains of orthovanadate species, (VO4)(n). The FTIR spectra of adsorbed CO revealed that the number of exposed Zr4+ ions decreased markedly when vanadium(v) peroxo ions were used as precursors. The predominant surface structure in this case was identified as pyrovanadates, V2O7. On all of the samples studied no separate phase of V2O5 was detected.
      Keywords
      Ammonium vanadate
      Cation
      Orthovanadic acid
      Vanadium
      Zirconium oxide
      Absorption spectroscopy
      Chemical analysis
      Oxidation
      Physical chemistry
      Synthesis
      Permalink
      http://hdl.handle.net/11693/25022
      Published Version (Please cite this version)
      http://dx.doi.org/10.1039/b001982h
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