| 摘要 |
A catalyst for use in the synthesis of hydrocarbons from carbon monoxide and hydrogen and/or steam, consists of iron oxide which has been pre-treated at 200 DEG to 500 DEG C. with a gas containing more than 50 per cent of oxygen and preferably more than 90 per cent. Pressures from 2 to 20 atmospheres may be applied. The iron oxide may contain alkalis and promotors when the temperature used should be 300 DEG C. or more. In the case of alkali-free iron oxide, a temperature range of 200 DEG to 250 DEG C. is used. In examples: (1) pure iron oxide (trivalent iron) is precipitated from ferric nitrate solution with ammonia, and the iron oxide is treated at 240 DEG C. with 98 per cent oxygen for 6 hours. The resulting catalyst is mixed with slack wax (Gatsch) to form a 10 per cent suspension, and used in a reactor containing carbon monoxide and hydrogen in proportions 3 to 2, at 240 DEG to 300 DEG C. under a pressure of 10 atmospheres. (2) Iron oxide containing 0.2 parts of Cu and 0.6 parts of potassium carbonate per 100 parts of iron is treated for 6 hours at 400 DEG C. with 98 per cent oxygen, and after an activating treatment with carbondioxide free generator gas used as a catalyst in a reactor containing carbon monoxide and steam. (3) The alkalized iron oxide prepared in Example 2 is treated with 98 per cent oxygen at 400 DEG C. under 8 atmospheres pressure. The products of the synthesis of carbon monoxide and steam contain 30 to 35 per cent of hydrocarbons boiling above 320 DEG C. |
