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

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.

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Walter, Anke1, Author
Herbert, Rita2, Author              
Hess, Christian2, 3, Author              
Ressler, Thorsten1, Author
Affiliations:
1Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany, ou_persistent22              
2Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
3Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Petersenstr. 20, 64287 Darmstadt, Germany, ou_persistent22              

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Free keywords: in situ X-ray absorption spectroscopy; VxOy/SBA-15; V2O7
 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.

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Language(s): eng - English
 Dates: 2010-02-11
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1186/1752-153X-4-3
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Title: Chemistry Central Journal
Source Genre: Journal
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Pages: - Volume / Issue: 4 Sequence Number: 3 Start / End Page: - Identifier: -