VERFAHREN ZUR HERSTELLUNG EINES FÄLLUNGSKATALYSATORVORLÄUFERS FÜR DIE AMMONIAKSYNTHESE.

摘要

Described is a process for producing the precursor of a precipitated catalyst for the NH3 synthesis, based on Fe, Al, Co and K oxides, which comprises the steps of: (A) preparing an aqueous solution of water-soluble compounds of Fe, Al and Co - iron being present as water-soluble ferrous salt of an organic acid - and causing, by addition of an alkaline precipitating solution, the co-precipitation of the corresponding Fe, Al and Co hydroxides, which still contain the iron in the ferrous form; (B) oxidizing the hydroxide suspension prepared according to step (A) until the ratio of divalent iron to trivalent iron ranges from 0.20 to 0.50; (C) conducting an alkaline doping operation with a potassium compound and heating the resulting mixture in an inert atmosphere to at least 850 DEG C.