Spectroscopic characterization of vanadium(v) oxo species deposited on zirconia
Author(s)
Date
2000Source Title
Physical Chemistry Chemical Physics
Print ISSN
1463-9076
Publisher
Royal Society of Chemistry
Volume
2
Issue
13
Pages
3043 - 3048
Language
English
Type
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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 vanadateCation
Orthovanadic acid
Vanadium
Zirconium oxide
Absorption spectroscopy
Chemical analysis
Oxidation
Physical chemistry
Synthesis