title: Quantitative chemical state analysis of supported vanadium oxide catalysts by high resolution vanadium Kα spectroscopy.
abstract: Oxidation states of vanadium species on Al(2)O(3), SiO(2), and TiO(2) were quantitatively analyzed by least-squares fitting of V Kα spectra recorded with a two-crystal X-ray fluorescence spectrometer. Uncertainties of analytical results by the normalization procedure, and coefficient of validation and the reduction behavior of vanadium species by X-ray irradiation were discussed. The V(5+)/V(4+)/V(3+) ratios on Al(2)O(3), SiO(2), and TiO(2) calcined at 773 K in air were determined to be ca. 6/3/1, 3/6/1, and 5/4/1, respectively. The possible chemical states of vanadium species on supports were proposed.
authors.affiliation: Department of Mathematical and Material Science, Faculty of Integrated Arts and Sciences, The University of Tokushima, Tokushima, Japan. t-yamamo@ias.tokushima-u.ac.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Fumitaka
authors.initials: F
authors.lastname: Nanbu
authors.forename: Tsunehiro
authors.initials: T
authors.lastname: Tanaka
authors.forename: Jun
authors.initials: J
authors.lastname: Kawai