Precipitated iron catalyst for Fischer-Tropsch synthesis and preparation method thereof
A technology for synthesis of catalysts and tropes, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, physical/chemical process catalysts, etc., can solve the problems of catalytic activity of skeleton iron catalysts, lack of selectivity and stability of olefins, and energy consumption of catalyst preparation High CO conversion rate and high reactivity, high selectivity and reasonable distribution
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[0031] In the preparation method provided by the present invention, soluble metal salts include but are not limited to metal nitrates, sulfates and oxalates, as long as they have good solubility in deionized water. Specifically, the raw material of Fe is preferably for Fe(NO 3 ) 3 ; The raw material of Mn is preferably Mn (NO 3 ) 2 ; The raw material of Ti is preferably potassium titanium oxalate (K 2 TiO(C 2 o 4 ) 2 ); The raw material of Cu is preferably Cu(NO 3 ) 2 or CuCl 2 .
[0032] In the preparation method provided by the present invention, the precipitant solution in step (2) includes but is not limited to a deionized aqueous solution of ammonium carbonate, sodium carbonate, potassium carbonate, potassium bicarbonate, sodium hydroxide, potassium hydroxide and ammonia water , preferably ammonium carbonate or sodium carbonate, and the concentration of the precipitant solution is 0.3-2 mol / L, preferably 0.5-1.5 mol / L.
[0033] During the precipitation reaction...
Embodiment 1
[0044] Take by weighing ferric nitrate nonahydrate 40.4kg, manganese nitrate (Mn(NO 3 ) 2 4H 2 O) 3.43kg, copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 0.8kg, potassium titanium oxalate dihydrate (K 2 TiO(C 2 o 4 ) 2 2H 2 O) 2.43kg, add deionized water to dissolve, make a metal salt solution with a Fe concentration of 2.0mol / L, and preheat to 70°C. Take 19 kg of sodium carbonate, add deionized water to dissolve it, configure it as a sodium carbonate precipitant solution with a concentration of 1.0 mol / L, and preheat it to 70°C.
[0045] The metal salt solution and the precipitant solution were poured into a reaction beaker containing 300 mL of 70°C deionized water, and the precipitation reaction was carried out while the temperature was kept at 70°C and stirred. When the pH is controlled at 6.0±0.3, the stirring is terminated, and the precipitation reaction time is 5 minutes to obtain a precipitation slurry. The precipitated slurry was aged at 80° C. for 0.5 h, filtered and ...
Embodiment 2
[0050] Take by weighing ferric nitrate nonahydrate 40.4kg, manganese nitrate (Mn(NO 3 ) 2 4H 2 O) 0.8kg, copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 1.1kg, potassium titanium oxalate dihydrate (K 2 TiO(C 2 o 4 ) 2 2H 2 O) 1.0kg, add deionized water to dissolve, make the concentration of Fe is 2.2mol / L metal salt solution, preheat to 60℃. Weigh 35 kg of ammonium carbonate solid, add deionized water to dissolve, prepare ammonium carbonate precipitant solution with a concentration of 0.7 mol / L, and preheat to 35°C.
[0051] The metal salt solution and the precipitating agent solution are flowed into a reaction beaker containing 25 kg of 40° C. deionized water, and the precipitation reaction is carried out while maintaining the temperature at 40° C. and stirring to obtain a precipitation slurry. The precipitation reaction time is 70 minutes. Adjust the pH of the precipitation slurry to 8.5±0.3, age at 60° C. for 3.5 hours, filter and wash three times to obtain a co-precipitatio...
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