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Characterization of the Synthesis and Reactivity Behavior of Nanostructured Vanadia Model Catalysts using XPS and Vibrational Spectroscopy

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

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Citation

Hess, C. (2006). Characterization of the Synthesis and Reactivity Behavior of Nanostructured Vanadia Model Catalysts using XPS and Vibrational Spectroscopy. Surface science, 600, 3695-3701. doi:10.1016/j.susc.2005.11.063.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-04CB-0
Abstract
Nanostructured vanadia model catalysts, i.e. highly dispersed vanadium oxide supported on mesoporous silica SBA-15 (VOx/SBA-15), were prepared. The mechanism for the synthesis of VOx/SBA-15 was elucidated by detailed characterization of the individual synthesis steps using XPS and vibrational spectrocopy. The resulting surface vanadium oxide species (0 – 2.3 V/nm2), grafted on the inner pores of the SBA-15 silica matrix, consists of tetrahedrally coordinated vanadia as inferred from UV-VIS- and Raman spectroscopy. The prepared vanadia model catalysts were tested in the partial oxidation of methanol to formaldehyde yielding high formaldehyde selectivities of 94% at 350ºC. XPS and Raman analysis of the catalyst after reaction reveal the presence of methoxy as well as a significant amount of carbonaceous species on the surface. Our results demonstrate that a detailed understanding of partial oxidation reactions requires the combination of complementary spectroscopic techniques ultimately within one experimental set-up.