Structure-sensitivity study of partial propene oxidation over AV2P2O10 vanadium phosphate compounds

Abstract

The activity and selectivity of five AV₂P₂O₁₀ compounds have been examined with respect to the mild oxidation of propene at different temperatures. These materials with orthorhombic symmetry (ACa, Cd) or monoclinic symmetry (ABa, Pb, Cd) have been prepared as well crystallized samples in an evacuated silica tube. Their crystalline structure, followed by X-ray diffraction (XRD), was unchanged after the catalytic reaction and their structural properties made them ideal model catalysts to study structure-sensitivity effects. Orthorhombic compounds were more active than monoclinic ones. Catalytic results were discussed, taking into account the nature of the inserted cations, the distortion of the framework and the organization of the lattice polyhedra.