Composition containing chi iron carbide, and preparation method thereof, catalyst and application thereof, and Fischer-Tropsch synthesis method
A technology of Fischer-Tropsch synthesis and composition, which is applied in the preparation of liquid hydrocarbon mixtures, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high selectivity of by-products, and achieve simple and easy-to-obtain raw materials and CO2 selectivity The effect of low cost and simple operation steps
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[0044] In the preparation method provided by the present invention, the average particle diameter of the nano iron powder can be measured by X-ray diffraction method. Preferably, the average grain diameter of the nano iron powder is 5-35 nm, more preferably 10-27 nm. The nano-powder iron compound can be a compound containing iron, preferably, the nano-powder iron compound is selected from nano iron oxide powder, nano magnetite powder, nano goethite powder and nano iron hydrate oxide powder at least one of them.
[0045] In the present invention, if the raw material in step (1) is nano iron powder, step (1) can play the role of surface purification treatment of nano iron powder; if the raw material in step (1) is obtained by in-situ reduction For the nano-powder iron compound of the nano-iron powder, the step (1) can simultaneously reduce the nano-powder iron compound to form the nano-iron powder and perform the surface purification treatment on the generated nano-iron powder....
Embodiment 1
[0085] (1) Take 10.0 g of iron powder with an average grain diameter of 20 nm, at 510 ° C, with a pressure of 2.5 atm and a gas flow of 16000 mL / h / g of H 2 Reduction and surface purification treatment were carried out under 2h;
[0086] (2) the product obtained in step (1) is cooled to 30 ° C, and at this temperature, with O-containing 2 Surface passivation treatment by gas contact, O in the gas 2 The volume concentration is 5%, the pressure is 0.09atm, the gas flow is 8500mL / h / g, and the processing time is 10h;
[0087] (3) will contain O 2 The gas mixture is changed to H 2 Mixed gas with CO, the conditions are: pressure 2.5atm, total gas flow 18000mL / h / g, H 2 The molar ratio to CO is 100:1, and then under this condition, the temperature is raised from 30 °C to 400 °C at a heating rate of 2.5 °C / min, and then the product obtained in step (2) is prepared by carbide to obtain iron carbide, which is subjected to Pohl spectrum is determined as pure χ iron carbide, which is r...
Embodiment 2
[0090] (1) Take 10.0 g of iron oxide powder with an average grain diameter of 15 nm, at 350 ° C, with a pressure of 0.22 atm and a gas flow of 1200 mL / h / g of H 2 Reduction and surface purification treatment were carried out for 12h under low temperature;
[0091] (2) the product obtained in step (1) is cooled to 50 ° C, and at this temperature, with O-containing 2 Surface passivation treatment by gas contact, O in the gas 2 The volume concentration is 1%, the pressure is 0.01atm, the gas flow is 1400mL / h / g, and the processing time is 56h;
[0092] (3) will contain O 2 The gas mixture is changed to H 2 Mixed gas with CO, the conditions are: pressure 0.15atm, total gas flow 2000mL / h / g, H 2 The molar ratio to CO is 8:1, and then under this condition, the temperature is raised from 50 °C to 260 °C at a heating rate of 0.2 °C / min, and then the product obtained in step (2) is prepared by carbide to obtain iron carbide, which is subjected to The Powell spectrum is determined as ...
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