Crystalline Mo3VOx Mixed-Metal-Oxide Catalyst with Trigonal Symmetry

摘要

About a quarter of all organic products are synthesized by selective partial oxidation and continuous efforts have been made to develop high-performance catalysts that improve conversion and selectivity. The majority of catalysts are metal oxides with either molybdenum or vanadium as one of the key elements.[1] Recently, much attention has been paid to orthorhombic MoVTe(Sb)NbO mixed-metal-oxide catalysts developed by Mitsubishi Chemicals, which have the best performance in propane oxidation to acrylic acid and ammoxidation to acrylonitrile.[2] Although a fully analyzed crystal structure of the catalyst has not yet been reported, it was shown that this complex mixed-metal oxide has a layered, orthorhombic structure with a slab comprising 6- and 7-rings of {MO6} octahedra and pentagonal {(M)M5O27} units with a {MO7} pentagonal bipyramidal unit and five edge-sharing {MO6} octahedra (M is a metal atom; Figure 1 a).