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Structural characterization of vanadium oxide catalysts supported on nanostructured silica SBA-15 using X-ray absorption spectroscopy

MPS-Authors
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Herbert,  Rita
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21627

Hess,  Christian
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt;

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Citation

Walter, A., Herbert, R., Hess, C., & Ressler, T. (2010). Structural characterization of vanadium oxide catalysts supported on nanostructured silica SBA-15 using X-ray absorption spectroscopy. Chemistry Central Journal, 4: 3. doi:10.1186/1752-153X-4-3.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-512D-2
Abstract
The local structure of vanadium oxide supported on nanostructured SiO2 (VxOy/SBA-15) was investigated by in situ X-ray absorption spectroscopy (XAS). Because the number of potential parameters in XAS data analysis often exceeds the number of "independent" parameters, evaluating the reliability and significance of a particular fitting procedure is mandatory. The number of independent parameters (Nyquist) may not be sufficient. Hence, in addition to the number of independent parameters, a novel approach to evaluate the significance of structural fitting parameters in XAS data analysis is introduced. Three samples with different V loadings (i.e. 2.7 wt %, 5.4 wt %, and 10.8 wt %) were employed. Thermal treatment in air at 623 K resulted in characteristic structural changes of the V oxide species. Independent of the V loading, the local structure around V centers in dehydrated VxOy/SBA-15 corresponded to an ordered arrangement of adjacent V2O7 units. Moreover, the V2O7 units were found to persist under selective oxidation reaction conditions.