Effect of synthesis conditions on the formation of phase composition of the MoVTe(Nb)-oxide catalyst for propane oxidation

A successful replacement of expensive propylene with propane via the development of the catalysts for ammoxidation to acrylonitrile is an important and open challenge. To date, multicomponent oxide catalysts MomVnTekNbх are the most perspective in the ammoxidation of propane to acrylonitrile. Reproducibility of the physicochemical and catalytic characteristics is very large problem. To optimize the technology of catalyst synthesis we have studied influence of the method of the slurry drying of aqueous suspension of starting chemicals (heat evaporation or spray drying) on the formation of Mo1V0,3Te0,23(Nb0,12)-oxide catalysts. It was demonstrated that the method of the slurry drying has a pronounced effect on the chemical and phase composition of solid precursor which ultimately influences the phase formation of final Mo1V0,3Te0,23(Nb0,12)-oxide catalyst at high temperature treatment. The slurry spray drying provides required the physicochemical characteristics (specific surface and phase composition) guaranteeing the most high activity and selectivity of the catalysts in the ammoxidation of propane to acrylonitrile. The catalysts contain two main crystalline phases, orthorhombic M1 and hexagonal M2 in optimal ratio.

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