51V MAS NMR and XAFS Evidences for Redox of Magnesium Pyro- and Ortho-Vanadates on the Oxidative Dehydrogenation of Propane

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  • SUGIYAMA Shigeru
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima Department of Geosphere Environment and Energy, Center for Frontier Research of Engineering, The University of Tokushima Department of Chemical Science and Technology, The University of Tokushima
  • HIRATA Yuuki
    Department of Chemical Science and Technology, The University of Tokushima
  • OSAKA Takeshi
    Department of Chemical Science and Technology, The University of Tokushima
  • MORIGA Toshihiro
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima Department of Chemical Science and Technology, The University of Tokushima
  • NAKAGAWA Keizo
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima Department of Geosphere Environment and Energy, Center for Frontier Research of Engineering, The University of Tokushima Department of Chemical Science and Technology, The University of Tokushima
  • SOTOWA and Ken-Ichiro
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima Department of Geosphere Environment and Energy, Center for Frontier Research of Engineering, The University of Tokushima Department of Chemical Science and Technology, The University of Tokushima

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To evaluate the redox nature of magnesium vanadates during the oxidative dehydrogenation of propane, magnesium pyro- and othro-vanadates (Mg2V2O7 and Mg3V2O8, respectively) used for the conversion of propane with and without gaseous oxygen were analyzed by XRD, solid state 51V MAS NMR and XAFS. After the propane conversion without oxygen, complete conversion of those magnesium vanadates to the corresponding vanadate containing V4+ or V3+ species together with MgO was observed by XRD, while the reduction of V5+ was detected by 51V MAS NMR and V K-edge XAFS from those catalysts. However XRD and 51V MAS NMR revealed that re-oxidation of the reduced Mg3V2O8 resulted in the regeneration of the original phase together with that of a V5+ species, while the re-oxidation of the reduced Mg2V2O7 afforded a phase (triclinic system) different from the original one (monoclinic system), but, in which the V5+ species was regenerated from the reduced vanadium.<br>

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