Fischer-Tropsch synthesis cobalt-based catalyst prepared by adopting in-situ reduction and application of Fischer-Tropsch synthesis cobalt-based catalyst
A cobalt-based catalyst, Fischer-Tropsch synthesis technology, which is applied in the preparation of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, liquid hydrocarbon mixtures, etc., can solve problems such as reducing the difficulty of reactor manufacturing, Achieve the effect of reducing requirements, reducing reduction temperature, and expanding application fields
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Embodiment 1
[0023] Account for 25 (wt)% of the final catalyst by Co, take a certain amount of Co (NO 3 ) 2 ·6H 2 O, then weigh a certain amount of citric acid according to citric acid:cobalt nitrate (mol / mol)=2:1, the two are miscible in distilled water, adjust the pH to 7.5 with ammonia water, reflux at 60°C for 24h, and then impregnate with equal volume on carrier Al 2 o 3 on (press Al 2 o 3 accounted for 75 (wt)% of the final catalyst), dried at 110°C for 10h after impregnation, and then roasted at 400°C for 2h under a helium atmosphere, and then switched to nitrogen and oxygen mixed gas at room temperature, with an oxygen content of 15 %(v / v), passivated for 4h, the final catalyst was obtained, and the weight composition of the catalyst was Co:Al 2 o 3 =25:75.
[0024] Take 10 g of the above catalyst for reduction in a fixed bed reactor, the reduction conditions are: 180° C., 0.5 MPa, 500 h −1 (V / V), hydrogen, constant temperature for 12 h. The reaction conditions are: 180°C,...
Embodiment 2
[0026] Account for 20 (wt)% of the final catalyst by Co, weigh a certain amount of Co (CH 3 COO) 2 4H 2 O, then weigh a certain amount of malic acid according to malic acid: cobalt acetate (mol / mol) = 3:1, the two are miscible in distilled water, adjust the pH to 7.0 with ammonium carbonate, reflux at 70°C for 18 hours, and then impregnate with equal volume on carrier SiO 2 on (by SiO 2 Accounting for 80 (wt)% of the final catalyst (weighed), dried at 120°C for 6h after impregnation, and then roasted at 350°C for 4h under an argon atmosphere, and switched to nitrogen and oxygen mixed gas at room temperature, and the oxygen content was 1% (v / v), passivation for 12h, the final catalyst was obtained, and the weight composition of the catalyst was Co: SiO 2 =20:80.
[0027] Take 10g of the above catalyst for reduction in a fixed bed reactor, the reduction conditions are: 200°C, 0.5MPa, 1000h -1 (V / V), hydrogen, constant temperature 24h. The reaction conditions are: 190°C, 1...
Embodiment 3
[0029] Account for 40 (wt)% of the final catalyst by Co, weigh a certain amount of CoSO 4 ·7H 2 O, and then weigh a certain amount of tartaric acid according to tartaric acid: cobalt sulfate (mol / mol) = 4:1, the two are miscible in distilled water, adjust the pH to 8.0 with ammonium bicarbonate, reflux at 80°C for 12h, and then impregnate an equal volume in Carrier ZrO 2 on (press ZrO 2 accounted for 60 (wt)% of the final catalyst), dried at 100°C for 8h after impregnation, and then roasted at 300°C for 6h under a nitrogen atmosphere, and switched to nitrogen and oxygen mixed gas at room temperature, with an oxygen content of 5 %(v / v), passivated for 10h, the final catalyst was obtained, and the weight composition of the catalyst was Co:ZrO 2 =40:60.
[0030] Take 10g of the above catalyst for reduction in a fixed bed reactor, the reduction conditions are: 190°C, 0.3MPa, 1500h -1 (V / V), hydrogen, constant temperature for 12h. The reaction conditions are: 2000°C, 1.8Mpa, ...
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