| 摘要 |
A sintered iron oxide catalyst is prepared by impregnating red iron oxide powder with from 0.5 to 5 per cent by weight of an alkali metal salt, preferably potassium carbonate or fluoride, drying the impregnated oxide, pilling it, optionally with the aid of a pilling compound, fragmenting the pills until all the material passes a 40-mesh sieve and reducing the particles in a fluidized bed preferably with hydrogen at 900-1100 DEG F., followed by sintering in a non-oxidizing atmosphere preferably between 1250 DEG and 1650 DEG F. The hydrogen throughput in the reduction step is preferably between 750 and 1500 v/v/hour and may be reduced during the latter part of the sintering to 100-200 v/v/hour. Preferably the initial impregnated material is broken into fragments passing a 10-mesh sieve, followed by a 20-mesh sieve, the retained and unretained portions on the latter being filled separately. The sintered granules after cooling may require a light grinding to render them suitable for fluidized operation. |
