Role of Mechanical Treatment in Preparation of Multicomponent Bismuth Molybdate Catalyst for Propylene Ammoxidation

The multicomponent catalyst Mo12Bi1Fe3Co4.5Ni2.5K0.1P0.5Ox/SiO2 (50% w/w) for propylene ammoxidation was prepared by mechanical treatment of the initial components and compared with the catalyst obtained by co-precipitation. Data on its catalytic activity, selectivity and texture (surface area and porosity) are reported. X-Ray study of the samples subjected to mechanical treatment for different times (from 0.5 to 12 h) showed that the treatment leads to changes in phase composition of the catalyst which become more pronounced on prolonged grinding time. The increase of grinding time results also in reduction of the surface area and porosity of the catalysts. Notwithstanding, data obtained demonstrate that mechanical treatment exerts favourable effect on the activity of Fe-Bi-Mo oxide catalysts.