Composition containing epsilon/epsilon' iron carbide and theta iron carbide, and preparation method thereof, catalyst and application thereof, and Fischer-Tropsch synthesis method
A technology of Fischer-Tropsch synthesis and iron carbide, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and preparation of liquid hydrocarbon mixtures. It can solve the problem of high selectivity of by-products, and achieve simple and easy-to-obtain raw materials and simple operation steps , low cost effect
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[0053] In the preparation method provided by the present invention, steps (1) and (2) are used to prepare iron carbide of different crystal forms. Nano-iron powder is selected as the raw material for preparation, and 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 4-35nm, more preferably 10-27nm. The nano-powder iron compound may be a compound containing iron element, preferably, the nano-powder iron compound is selected from nano-iron oxide powder, nano-magnetite powder, nano-goethite powder and nano-iron hydrated oxide powder at least one of the The nano-iron powder and nano-powder iron compound are used as raw materials for preparing ε / ε' iron carbide and θ iron carbide.
[0054] In the present invention, if the raw material in steps (1-1), (2-1) is nano-iron powder, steps (1-1), (2-1) can play the role of surface purification treatment on nano-iron powder ...
Embodiment approach
[0063] According to a preferred embodiment of the present invention, the preparation of the first carbide further includes: step (1-3) in which the heating operation is carried out simultaneously, from the temperature of the pretreatment at a heating rate of 0.2-5°C / min Raise the temperature to 180-280°C. In this preferred embodiment, the obtained pure phase ε / ε' iron carbide can have better effective product selectivity in the Fischer-Tropsch synthesis reaction. Further preferably, the pretreatment temperature is raised to 200-270° C. at a rate of 0.2-2.5° C. / min. In the temperature raising operation, the temperature of the pretreatment refers to the temperature in step (1-2) of 80-180°C. That is to say, the heating operation is: from 80-180°C to the temperature of 180-280°C at a rate of 0.2-5°C / min from 80-180°C, preferably from 80-180°C at a rate of 0.2-2.5°C / min The heating rate is to increase the temperature to 200-270°C.
[0064] In the present invention, steps (1-2) ...
preparation example 1
[0105] (1) Take 10.0g of nano-iron powder, with an average grain diameter of 20nm, at 390°C, with a pressure of 1atm and a gas flow rate of 8500mL / h / g 2 Carry out the first surface purification treatment for 2.5 hours;
[0106] (2) The product obtained in step (1) is cooled to 160°C, and at 160°C with H 2 Mixed gas with CO (pressure 1.5atm, total gas flow 7000mL / h / g, H 2 Contact with CO molar ratio (2.0:1) for pretreatment for 45 minutes;
[0107] (3) change H 2 The conditions of the mixed gas with CO are: pressure 2.1atm, total gas flow 13000mL / h / g, H 2 The molar ratio to CO is 1.5:1, and under this condition, the temperature is raised from 160°C to 250°C at a heating rate of 1.5°C / min, and then the material obtained in step (2) is prepared for the first carbide to obtain pure ε / ε'iron carbide (determined by Mössbauer spectroscopy), recorded as iron carbide 1.
[0108] The preparation method of pure ε / ε' iron carbide provided by the present invention is not limited to P...
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