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Abstract

V2O5 dispersed on high surface area metal oxides, such as SiO2,
Al2O3, TiO2, or ZrO2, has been the topic of many experimental and
theoretical approaches targeted at a deeper understanding of
heterogeneous oxidation catalysis on a molecular level.1 Structure,
reactivity and stability of the active, two-dimensional vanadium
oxide surface species depend on catalyst synthesis, nature of the
support and reaction conditions. In the present work, highly
dispersed VxOy supported on mesoporous silica (SBA-15)
modified with titania has been used as a model system to
investigate the vanadia-support interaction and the effect of the
degree of aggregation of vanadium oxo-species on the reactivity in
oxidative dehydrogenation (ODH) of propane applying in-situ
spectroscopic techniques.