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Pure phase epsilon/epsilon' iron carbide catalyst used for Fischer-Tropsch synthesis reaction, preparation method of pure phase epsilon/epsilon' iron carbide catalyst, and Fischer-Tropsch synthesis method

A technology of Fischer-Tropsch synthesis and catalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., and can solve complex preparation process, high by-product selectivity, raw material Expensive and other issues, to achieve the effect of simple operation steps, simple and easy-to-obtain raw materials, and low cost

Active Publication Date: 2019-10-18
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In the above-mentioned technologies, there are complex preparation processes, relatively expensive raw materials, poor catalyst stability, and CO 2 or CH 4 The problem of high selectivity of by-products

Method used

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  • Pure phase epsilon/epsilon' iron carbide catalyst used for Fischer-Tropsch synthesis reaction, preparation method of pure phase epsilon/epsilon' iron carbide catalyst, and Fischer-Tropsch synthesis method
  • Pure phase epsilon/epsilon' iron carbide catalyst used for Fischer-Tropsch synthesis reaction, preparation method of pure phase epsilon/epsilon' iron carbide catalyst, and Fischer-Tropsch synthesis method
  • Pure phase epsilon/epsilon' iron carbide catalyst used for Fischer-Tropsch synthesis reaction, preparation method of pure phase epsilon/epsilon' iron carbide catalyst, and Fischer-Tropsch synthesis method

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preparation example Construction

[0031] The first aspect of the present invention provides a kind of preparation method of the pure phase ε / ε' iron carbide catalyst that is used for Fischer-Tropsch synthesis reaction, wherein, this preparation method comprises the following steps:

[0032] (1) Nano-powder iron powder or a nano-powder iron compound capable of obtaining nano-iron powder by in-situ reduction with H 2 Surface purification treatment at a temperature of 250-510°C;

[0033] (2) the material that step (1) obtains and H 2 , CO pretreatment at a temperature of 80-180 °C, H 2 The molar ratio to CO is 1.2-2.8:1;

[0034] (3) the material that step (2) obtains and H 2 , CO at a temperature of 180-280 ° C for carbide preparation, H 2 The molar ratio to CO is 1.0-3.0:1.

[0035] In the preparation method of the present invention, the raw materials used are simple and easy to obtain, and the cost is low. Wherein, the nano-iron powder can be a conventional choice in this field, and can be a common commer...

Embodiment approach

[0045] According to a preferred embodiment of the present invention, the preparation method further includes: raising the temperature of the system after the pretreatment to 180-280° C. at a heating rate of 0.2-5° C. / min. In this preferred embodiment, the obtained pure phase ε / ε' iron carbide catalyst can have better effective product selectivity in the Fischer-Tropsch synthesis reaction. Further preferably, the temperature of the system after the pretreatment is raised to 200-270°C at a rate of 0.2-2.5°C / min

[0046] According to another preferred embodiment of the present invention, the processes of surface purification treatment, pretreatment and carbide preparation are carried out in a Fischer-Tropsch synthesis reactor. In this preferred embodiment, catalyst preparation and Fischer-Tropsch synthesis share the same reactor, therefore, the H in the catalyst preparation process 2 and CO raw materials can be the original raw materials of the Fischer-Tropsch synthesis reaction...

Embodiment 1

[0058] This embodiment is used to illustrate the preparation method of pure phase ε / ε' iron carbide catalyst. (For the convenience of comparison, all raw materials are from the same company, and the actual operation is not limited to the raw materials of this company).

[0059] (1) Weigh 1.00 g of nano-iron powder (purchased from alfa reagent company, CAS No. 7439-89-6) with an average grain diameter in the range of 21 ± 6 nm, and this nano-iron powder is named as precursor 1;

[0060] (2) Put the above-mentioned precursor 1 into a tubular Fischer-Tropsch synthesis reactor, and at a temperature of 250°C, feed H2 with a gas velocity of 2500ml / h / g. and a pressure of 2.5 atmospheres. 2 Flow, reaction 7h;

[0061] (3) The temperature in the reactor is lowered to 180°C, while the H 2 Flow switching to molar ratio H 2 / CO=1.2, the gas velocity is 6500ml / h / g., the total pressure is 0.05 atmospheric pressure (H 2 +CO) airflow, pretreatment reaction 75min;

[0062] (4) Switch the ...

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Abstract

The invention relates to the field of Fischer-Tropsch synthesis reaction catalysts, and discloses a pure phase epsilon / epsilon' iron carbide catalyst used for a Fischer-Tropsch synthesis reaction, a preparation method of the pure phase epsilon / epsilon' iron carbide catalyst, and a Fischer-Tropsch synthesis method. The preparation method comprises the following steps: (1) nano iron powder or a nanopowder iron compound capable of being subjected to in-situ reduction to obtain the nano iron powder is subjected to surface purification treatment with H2 at the temperature of 250-510 DEG C; (2) a material obtained in the step (1), H2 and CO are pretreated at the temperature of 80-180 DEG C, and the molar ratio of the H2 to the CO is (1.2 to 2.8):1; and (3) a material obtained in the step (2), H2 and CO are subjected to carbide preparation at the temperature of 180-280 DEG C, and the molar ratio of the H2 to the CO is (1.0 to 3.0):1. According to the preparation method, raw materials are simple, convenient and easy to obtain, the operation steps are simple and convenient, the 100% pure phase epsilon / epsilon' iron carbide catalyst can be prepared, and the catalyst has low CO2 and CH4 selectivity and high effective product selectivity.

Description

technical field [0001] The invention relates to the field of Fischer-Tropsch synthesis reaction catalysts, in particular to a pure-phase ε / ε' iron carbide catalyst for Fischer-Tropsch synthesis reaction, a preparation method thereof, and a Fischer-Tropsch synthesis method. Background technique [0002] my country's primary energy structure is characterized by rich coal, lack of oil, and little gas. With economic development, the dependence on foreign oil has been rising, reaching 61% in 2015, seriously affecting my country's energy security. Fischer-Tropsch synthesis is an increasingly important energy conversion pathway in recent years, which can combine carbon monoxide with H 2 of syngas into liquid fuels and chemicals. In recent years, because the indirect coal liquefaction technology of Fischer-Tropsch synthesis can realize the clean utilization of coal and partially solve the problem of dependence on foreign oil, it has become one of the preferred technologies for repl...

Claims

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Application Information

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IPC IPC(8): B01J27/22C10G3/00
CPCB01J27/22C10G3/45C07C1/04Y02P30/20B01J23/745C10G2/332B01J35/30B01J35/23B01J35/40C10G2/00B01J37/08B01J37/16B01J37/18
Inventor 王鹏吕毅军张魁蒋复国门卓武王涛孙琦缪平
Owner CHNA ENERGY INVESTMENT CORP LTD
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