An XPS study of dispersion and valence state of TiO2 supported vanadium oxide catalysts |
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| Authors: | S. Lars T. Andersson |
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| Affiliation: | (1) Department of Chemical Technology, Chemical Center, University of Lund, P.O. Box 124, S-221 00 Lund, Sweden |
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| Abstract: |  Monolayer vanadium species are mainly in the V(V) valence state, but with XPS a small fraction of V4+ species are identified. Prolonged analysis treatment increases the V4+ concentration. With increasing vanadium concentration, a monolayer coverage corresponding to 1 mg V2O5 per m2 develops, and it contains additional layers with a thickness of about 250 Å at 4 mg V2O5 per m2, covering 3% of its surface area. |
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| Keywords: | XPS ESCA V2O5/TiO2 catalysts V valence state V2O5 dispersion |
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