ESR studies of the solid solutions of vanadium ions in TiO2 |
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| Authors: | K Dyrek E Serwicka and B Grzybowska |
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| Institution: | (1) Institute of Chemistry, Jagiellonian University, Kraków, Poland;(2) Research Laboratories of Catalysis and Surface Chemistry, Polish Academy of Sciences, Kraków, Poland |
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| Abstract: | ESR studies on solid solutions of vanadium ions in a TiO2 rutile matrix show the presence of small amounts of V3+ ions beside V4+ ions. Heating in oxygen at 370°C and 450°C leads to oxidation of V3+ to V4+, the latter ions being however resistant to oxidation. The concentration of V3+ practically does not change upon treatment of the solid solutions by o-xylene-air mixtures at 400°C.
                     TiO2         V+3 V+4.   370°C 450°C V+3 V+4,  .  V+3 - — 400°C.
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