A kind of regeneration method and application of Fischer-Tropsch synthesis catalyst
A technology for catalyst, torrefaction synthesis, which can be used in catalyst regeneration/reactivation, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve problems such as catalyst deactivation
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[0021] The present invention also provides a Fischer-Tropsch synthesis method, comprising contacting the synthesis gas with the catalyst regenerated by the method of the present invention under Fischer-Tropsch synthesis conditions, and the operating conditions of the contact include: the temperature is 160-350 ℃ ℃, the pressure is 1~8MPa, the molar ratio of hydrogen and carbon monoxide is 0.4~2.5, and the hourly space velocity of the gas is 200~40000h -1 , preferably, the operating conditions of the contact include: the temperature is 160-300 ℃, more preferably 190-280 ℃, the pressure is 1-5MPa, the molar ratio of hydrogen and carbon monoxide is 1.0-2.5, more preferably 1.0-2.2 , the hourly space velocity of the gas is preferably 500h -1 ~30000h -1 .
[0022] Compared with the prior art, the regeneration method provided by the present invention greatly improves the selectivity, stability and operating temperature of the catalyst.
Embodiment 1
[0027] Take 100g alumina (Sasol product, specific surface area 175m 2 / g, average particle size 65 μm), 192.6 g of cobalt nitrate solution (cobalt content 14.9 wt %), 20.4 g lanthanum nitrate solution (lanthanum content 14.0 wt %) and 2.85 g ruthenium chloride (ruthenium content 5.0 wt %) were impregnated twice ) mixed solution. After each impregnation, it was dried at 120°C for 4h, and then calcined at 350°C for 2h. The cobalt content, calculated as elements, was 20.1% by weight, the lanthanum content was 2.0% by weight, and the ruthenium content was 0.1% by weight. After using for 2000h, it becomes a deactivated catalyst, and the catalyst activity is about 45% of the initial reaction (50h) at this time.
[0028] (1) Dewaxing
[0029] Settling the catalyst-containing slurry until the catalyst layer and the wax layer have obvious stratification, release the catalyst in the lower layer, and in situ at a temperature of 200 °C and purged with nitrogen at 1.0 MPa for 2 h, then g...
Embodiment 2
[0040] The catalyst used in this example is the same as that in Example 1, and becomes a deactivated catalyst after 2000 hours of use. At this time, the catalyst activity is about 45% of the initial reaction period (50 hours).
[0041] (1) Dewaxing
[0042] The catalyst-containing slurry was settled until the catalyst layer and the wax layer had obvious layers, the lower catalyst was released, and treated with 5 times the volume of C6-C12 synthetic light oil at 120°C and 2.0MPa for 2h. After the treatment, the solid and liquid are separated, and the solid is dried at 150° C. to a free-flowing powder, and the content of wax and carbon-containing combustible substances is 4.2% by weight.
[0043] (2) Control oxidation
[0044] The above free-flowing powder catalyst was weighed and oxidized at 350 °C for 4 h under a mixed atmosphere of 0.1 MPa, 0.5 vol% oxygen + 99.5% nitrogen, and then kept stable and continuously increased the oxygen concentration in the mixture to 21 vol% and...
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