Oxidative dehydrogenation of propane using lattice oxygen of vanadium oxides on silica

Abstract

Oxidative dehydrogenation of propane using lattice oxygen of vanadium oxide was carried out with a fix-bed flow reactor at 450 °C under atmospheric pressure. Vanadium oxide loaded on SiO₂ from V(t-BuO)₃O afforded a high propylene selectivity of 88.3% with a propane conversion of 26.5% based on the lattice oxygen of vanadium oxide. The catalyst prepared with V(t-BuO)₃O exhibited higher propane conversion and propylene selectivity than that prepared with NH₄VO₃. Raman, XPS, and XRD analyses revealed that isolated VO₄³⁻ species seem to be active sites in the ODHP. For the dehydrogenation of propane, the lattice oxygen of the isolated VO₄³⁻ species was used to give propylene and H₂O. The isolated VO₄³⁻ species was reduced to the isolated V³⁺ species and was regenerated by oxidation with oxygen. The activity was maintained for at least 10 repeated cycles, suggesting that VO_x/SiO₂ would be a promising catalyst for ODHP.