Hydrothermal preparation of well-crystallized MoV (Te)(Nb)O oxides as model of multifunctional catalysts in propane selective oxidation to acrylic acid

摘要

Single phasic MoV(Te)(Nb)O mixed oxides have been synthesized by hydrothermal method. The particular orthorhombic arrangement of elements was clearly superior to other MoV-based layer oxide catalysts in propane and propene selective oxidations. The role of each element was emphasized by comparison of binary MoVO, ternary MoVTeO and quaternary MoVTeNbO. Whereas Mo and V were clearly responsible for the network creation and for the catalytic activity, Te could bring an oxygen insertion function to the catalyst, resulting in a high selectivity to acrylic acid. Nb was rather minimizing the overoxidation rate of acrylic acid to COx.