1 research outputs found
Single-Site VO<sub><i>x</i></sub> Moieties Generated on Silica by Surface Organometallic Chemistry: A Way To Enhance the Catalytic Activity in the Oxidative Dehydrogenation of Propane
We
report here an accurate surface organometallic chemistry (SOMC)
approach to propane oxidative dehydrogenation (ODH) using a μ<sup>2</sup>-oxo-bridged, bimetallic [V<sub>2</sub>O<sub>4</sub>(<i>acac</i>)<sub>2</sub>] (<b>1</b>) (<i>acac</i> = acetylacetonate anion) complex as a precursor. The identity and
the nuclearity of the product of grafting and of the subsequent oxidative
treatment have been systematically studied by means of FT-IR, Raman,
solid-state (SS) NMR, UV–vis DRS, EPR and EXAFS spectroscopies.
We show that the grafting of <b>1</b> on the silica surface
under a rigorous SOMC protocol and the subsequent oxidative thermal
treatment lead exclusively to well-defined and isolated monovanadate
species. The resulting material has been tested for the oxidative
dehydrogenation of propane in a moderate temperature range (400–525
°C) and compared with that of silica-supported vanadium catalysts
prepared by the standard impregnation technique. The experimental
results show that the catalytic activity in propane ODH is strongly
upgraded by the degree of isolation of the VO<sub><i>x</i></sub> species that can be achieved by employing the SOMC protocol