| 摘要 |
A composite catalyst of iron oxide and an alkali metal pyroantimonate (see Group III), is used to synthesize hydrocarbons from a one to one hydrogen carbon monoxide mixture at a feed rate of 200 volumes per hour a temperature between 450 DEG and 675 DEG F. and a pressure between 120 and 500 pounds per square inch gauge.ALSO:A Fischer-Tropsch synthesis catalyst is prepared by heating a mixture of a major proportion of iron oxide and a minor proportion of an alkali metal pyroantimonate in a free oxygen containing atmosphere, then reducing at elevated temperature. The oxidation temperature is 1000 DEG F. and the reduction temperature 500-700 DEG F. The iron oxide is the alpha, gamma or ferro-ferric oxide. 80 per cent to 99.8 per cent by weight of oxide are used, the remainder being pyroantimonate. Ferro-ferric oxide and potassium pyroantimonate are mixed and slurried with alcohol. The paste is dried and ground to pass a 30-mesh screen and formed into pills which can be used in fixed bed or fluidized operation when ground to powder. The pills are heated in a free oxygen containing atmosphere at 1000 DEG F. for 4 1/2 hours, cooled and reduced at 700 DEG F. with hydrogen or 500 DEG F. with carbon monoxide. Potassium pyroantimonate is prepared by fuzing caustic potash, adding antimony pentoxide gradually thereto, heating and then cooling; water added, agitated, filtered; molten caustic potash added to the residue whilst filtrate set aside; operations repeated and the two filtrates combined, evaporated at reduced pressure until onset of crystallization, when mother liquor was filtered off; crystals purified by washing with alcohol until free from alkali, and then dried, prior to incorporation with the iron oxide. |
