Redox properties of vanadium ions in SBA-15-supported vanadium oxide: an FTIR spectroscopic study.

@article{Venkov2007RedoxPO,
  title={Redox properties of vanadium ions in SBA-15-supported vanadium oxide: an FTIR spectroscopic study.},
  author={Tzvetomir Venkov and Christian Hess and Friederike C. Jentoft},
  journal={Langmuir : the ACS journal of surfaces and colloids},
  year={2007},
  volume={23 4},
  pages={
          1768-77
        }
}
The state of vanadium ions in VxOy/SBA-15 (2.7 wt % V) was studied with FTIR spectroscopy using CO and NO as probe molecules. Neither CO (at 85 K) nor NO (at RT) adsorb on the oxidized sample because of the coordinative saturation of V5+ ions and the covalent character of the V5+=O bond. After treatment of the sample in 50 kPa H2 at 673 K, the V5+ ions are reduced to two different types of V3+ sites, as manifested by carbonyl bands at 2189 and 2177 cm-1. In the presence of O2 at 85 K, thus… CONTINUE READING

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