| abstract |
This invention relates to a process for the preparation of a composition of the general formula which is catalytically active for the gas phase oxidation of propylene to acrolein and acrylic acid Mo₁₂Bi 0.1-10 Fe 0.8-12 (Co, Ni) 0.1-10 P 0-2 A 0-10 B 0.001-1 O x , in the A for the elements arsenic, antimony, zinc, thallium, tungsten, alkaline earth metals, zinc and / or chromium, B for at least one of the metals sodium, potassium, rhubidium, cesium and / or indium and X for the atomic values of the individual elements certain numbers are available, in which the iron and molybdenum fraction is wholly or partly introduced in the form of dried powdered iron molybdate gel into an aqueous solution or suspension of the other constituents and the mixture is solidified with stirring and possibly heating, then crushed and added dried at elevated temperature and finally calcined. |