The influence of water on the dispersion of vanadia supported on silica SBA-15

Hess, Christian; Schlögl, Robert

doi:10.1016/j.cplett.2006.10.074

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The influence of water on the dispersion of vanadia supported on silica SBA-15

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Hess, Christian
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl, Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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引用

Hess, C., & Schlögl, R. (2006). The influence of water on the dispersion of vanadia supported on silica SBA-15. Chemical Physics Letters, 432(1-3), 139-145. doi:10.1016/j.cplett.2006.10.074.

引用: https://hdl.handle.net/11858/00-001M-0000-0011-0354-4

要旨

The influence of water on the dispersion of silica SBA-15 supported vanadia model catalysts has been studied using X-ray photoelectron spectroscopy (XPS) as well as UV-VIS and Raman spectroscopy. XPS characterization of the V2p3/2 state reveals the presence of two V5+ states, which are assigned to vanadia with distinctly different cluster size. Upon dehydration a dramatic change in their intensity ratio is observed as a result of a substantial increase in the vanadia dispersion. It is shown that the observed changes in vanadia dispersion are directly associated with the changes in the molecular structure of the surface vanadia species.