Supported vanadium oxo species are known to have many catalytic properties, such as oxidation (of SO2, CO, hydrocarbons, methanol), selective reduction of NOx, hydroamination and alkane dehydrogenation under oxidative and non-oxidative conditions. Even though the catalytic properties are well documented, the active species and the mechanism for many reactions are still a subject of debate. The main reason is related to the catalyst preparation (usually by impregnation followed by calcination) which often results in various active and inactive vanadium species on the surface. Current work presents the preparation of well-defined monopodal and bipodal vanadium(V)oxo-mesityl complexes supported on silica by surface organometallic chemistry. The synthesized solids have been characterized by FTIR, Raman, UV-Vis, solid state NMR (1H, 13C, 51V), XAFS and elemental analysis. Present data suggest that the solids comprise isolated vanadium oxo centers and can be described by the following formula: [(=SiO)V(=O)(Mes)2] on silica dehydroxylated at 700 �C and [(=SiO)2V(=O)(Mes)] on silica at 200 �C, as shown in figure 1. Both solids convert propane selectively to propene and hydrogen under non-oxidative condition. The bipodal catalyst exhibits slightly higher activity in propane dehydrogenation. 

Vanadium oxo organometallic species supported on silica for the selective non-oxidative dehydorgenation of propane

248th National Meeting (2014)

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