A kind of threshold-limited iron-based Fischer-Tropsch synthesis catalyst and preparation method thereof
An iron-based Fischer-Tropsch synthesis technology, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, etc., can solve the problems of catalyst structure damage, poor selectivity and stability, and catalyst performance degradation, etc. Achieve strong anti-sintering performance, high catalytic activity, and improved selectivity
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[0035] The present invention also provides a preparation method of the threshold-limiting iron-based Fischer-Tropsch synthesis catalyst described in the above technical solution, comprising the following steps:
[0036] (1) Provide carbon-based nanocages;
[0037] (2) Under vacuum conditions, the carbon-based nanocage is mixed with the iron precursor solution, then filtered and dried to obtain the carbon-based nanocage filled with the iron precursor in the cage;
[0038] (3) The carbon-based nano-cages filled with iron precursors in the cages are successively first calcined and passivated to obtain the first product of the threshold-limited iron-based Fischer-Tropsch synthesis catalyst;
[0039] (4) Using the primary product of the threshold-limiting iron-based Fischer-Tropsch synthesis catalyst as a carbon-based nanocage, repeat steps (2) to (3) until the required filling amount of iron-based nanoparticles is obtained to obtain a threshold-limiting iron-based Fischer-Tropsch...
Embodiment 1
[0072] Take by weighing 4g basic magnesium carbonate, join in the quartz reaction tube that places vertically, after spreading evenly, the reaction tube is evacuated with mechanical pump, feed argon again as carrier gas (100sccm), then with 10 ℃ / The temperature was raised to 800°C at a rate of 1 min, and benzene was input into the reaction tube with a constant flow pump at a flow rate of 0.020 mL / min. After 30 min of reaction, the temperature was lowered to room temperature, and a black powder was obtained in the quartz reaction tube. The obtained black powder was placed in 1 mol Soak in 1 / L hydrochloric acid solution for 30min, filter, wash with deionized water until neutral, and dry to obtain 0.2g carbon nanocage (ie CNC) with a specific surface area of 1700m 2 / g, the pore volume is 4.2cm 3 / g; the size range of the cage cavity is 10-30nm, repeat the above steps to obtain a sufficient amount of CNC;
[0073] Weigh 20.2g of ferric nitrate nonahydrate, dissolve it with de...
Embodiment 2
[0079] CNC is prepared according to the method of Example 1;
[0080] Weigh 4.04g ferric nitrate nonahydrate, dissolve it with deionized water, and prepare a 50mL solution with a concentration of 0.2mol / L for subsequent use;
[0081] Weigh 0.5g CNC and put it into a two-necked flask. One mouth of the two-necked flask is sealed with a rubber flip-top plug, and the other is connected to a vacuum pump. Vacuumize the two-necked flask until the pressure is below 20Pa and keep for 0.5h, then use a syringe to inject the ferric nitrate solution Pour it into a two-necked flask from the inversion plug, stir at room temperature for 12 hours, filter, and dry at 100°C for 10 hours; after grinding the dried sample into powder, add 50 mL of deionized water and stir for 0.5 hours to wash, then filter, and filter the obtained The solid was dried in a blast oven at 100°C for 10h, and then the obtained sample was placed in a porcelain boat and placed in a tube furnace. Under the protection of 10...
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