A kind of Fischer-Tropsch synthesis iron-based catalyst and preparation method thereof
An iron-based catalyst and Fischer-Tropsch synthesis technology, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, physical/chemical process catalysts, etc., can solve the problem of large amount of potassium source raw materials, unsatisfactory catalyst stability and oil yield To achieve the continuity of the process, save washing water, improve stability and oil yield
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[0015] The present invention provides a kind of preparation method of Fischer-Tropsch synthesis iron-based catalyst, wherein, the method comprises:
[0016] (1) The aqueous solution of iron salt, copper salt and cobalt salt is subjected to coprecipitation reaction with precipitation agent, obtains precipitation slurry;
[0017] (2) aging the precipitated slurry obtained in step 1, adjusting the pH to 4.0-10.0, and filtering to remove water to obtain a filter cake;
[0018] (3) The filter cake obtained in step 2) is beaten with water to make a slurry, which is then spray-dried and roasted;
[0019] (4) remove sodium ions and nitrate ions in the product through roasting in step 3);
[0020] (5) drying the product obtained in step 4), and placing it in the potassium source solution for impregnation;
[0021] (6) Roasting the impregnated product in step 5) to obtain a Fischer-Tropsch synthesis iron-based catalyst;
[0022] And, in step 1) and / or step 2), silicon compound soluti...
Embodiment 1
[0039] 25kg iron nitrate nonahydrate, 0.7kg copper nitrate and 4.5kg cobalt nitrate hexahydrate were dissolved in deionized water to make 160 liters of solution, and 12.5 kg of sodium carbonate was dissolved in deionized water to make 80 liters of solution. Use a pump to flow ferric nitrate, copper nitrate, cobalt nitrate solution and sodium carbonate solution into the reaction kettle, control the temperature in the reaction kettle at 60°C, and control the pH value at 6. After the precipitation is completed, let it stand for aging for 30 minutes. at 60°C; then add a concentration of 15% sodium silicate solution, use nitric acid to control the pH of the material at 5.0, and then squeeze out the moisture through a filter; add demineralized water to control the slurry with a solid content of 20% by mass. The inlet temperature is controlled at 250°C, and the hot air temperature at the exhaust outlet is spray-dried at 120°C, and the sprayed catalyst is roasted in the first stage, th...
Embodiment 2
[0043] 25kg ferric nitrate nonahydrate, 0.40kg copper nitrate, and 0.28kg cobalt nitrate hexahydrate were dissolved in deionized water to make 160 liters of solution, and 12.5 kg of sodium carbonate was dissolved in deionized water to make 80 liters of solution. Use a pump to flow ferric nitrate, copper nitrate, cobalt nitrate solution and sodium carbonate solution into the reaction kettle, control the temperature in the reaction kettle at 80°C, and control the pH value at 8.5. at 80°C; then add a concentration of 15% sodium silicate solution, use nitric acid to control the pH of the material at 4.5, and then squeeze out the moisture through a filter; add demineralized water to control the slurry with a solid content of 20% by mass. The inlet temperature is controlled at 250°C, and the hot air temperature at the exhaust outlet is spray-dried at 120°C, and the sprayed catalyst is roasted in the first stage, the temperature is controlled at 200°C, the time is controlled at 1 hour...
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