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Reduction method for iron-based catalyst for Fischer-Tropsch synthesis in fixed bed

An iron-based catalyst and Fischer-Tropsch synthesis technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as inability to continue the reaction, affect catalyst activity, and excessive carbon deposition in the catalyst. Achieve the effect of strong anti-wear ability, less carbon deposition on the catalyst, and less carburization of the catalyst

Active Publication Date: 2015-07-01
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong carbon deposition ability of CO, it is easy to cause excessive carbon deposition on the catalyst during the reduction process, which will affect the activity of the catalyst.
Excessive carburization in a fixed bed reactor will lead to pulverization of the catalyst and a significant increase in bed pressure, making it impossible to continue the reaction

Method used

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  • Reduction method for iron-based catalyst for Fischer-Tropsch synthesis in fixed bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Load 5g of Fischer-Tropsch synthesis iron-based catalyst into the fixed bed reactor, the catalyst composition is 100Fe / 10Ce / 5Cu / 6K / 30SiO 2 (for mass ratio). Feed H into the fixed bed reactor 2 , adjust the reactor pressure to 2.0MPa, and the space velocity to 3000h -1 , the circulation ratio is 5, and the reactor is raised to 360° C. by room temperature with a temperature increase rate of 10° C. / h for 6 hours. Reduce the reduction temperature to 320°C at 10°C / h, switch the reducing atmosphere to H 2 / C 2 h 4 (20:1 molar ratio) mixed gas, space velocity 3000h -1 , the circulation ratio is 5, and the iron-based catalyst after reduction is obtained at 320° C. for 20 h under the atmosphere, which is denoted as A.

[0032] After the reduction, the reactor is adjusted to the reaction conditions to carry out the Fischer-Tropsch synthesis reaction. The reaction conditions are: the temperature is 275°C, the pressure is 2.0MPa, and the raw material gas is H 2 / CO=2.0 (mol...

Embodiment 2

[0035]Load 10g Fischer-Tropsch synthesis iron-based catalyst into the fixed bed reactor, the catalyst composition is 100Fe / 5La / 3Cu / 1Rb / 30Al 2 o 3 (for mass ratio). Feed H into the fixed bed reactor 2 , adjust the reactor pressure to 3.0MPa, and the space velocity to 500h -1 , the circulation ratio is 15, and the reactor is raised to 260° C. by room temperature with a temperature increase rate of 5° C. / h for 24 hours at a constant temperature. Switch the reducing atmosphere to H 2 / C 3 h 8 (Molar ratio is 10:1) mixed gas, space velocity 500h -1 , the circulation ratio is 10, and the temperature is kept at 260° C. for 48 h to obtain the reduced iron-based catalyst, denoted as B.

[0036] After the reduction, the reactor is adjusted to the reaction conditions to carry out the Fischer-Tropsch synthesis reaction. The reaction conditions are: temperature 270°C, pressure 3.0MPa, raw material gas is H 2 / CO=1.2 (molar ratio), the space velocity is 5000h -1 , and the cycle ra...

Embodiment 3

[0038] Load 10g Fischer-Tropsch synthesis iron-based catalyst into the fixed bed reactor, the catalyst composition is 100Fe / 3Cr / 1K / 15SiO 2 (for mass ratio). H in the fixed bed reactor 2 / C 3 h 8 =1 mixed gas, adjust the reactor pressure to 0.3MPa, and the space velocity to 1000h -1 , the circulation ratio is 0 (the tail gas does not circulate), the reactor is raised from room temperature to 280°C at a rate of 10°C / h, and then the temperature is kept constant for 30h. The reduced iron-based catalyst was obtained, denoted as C.

[0039] After the reduction, the reactor is adjusted to the reaction conditions to carry out the Fischer-Tropsch synthesis reaction. The reaction conditions are: the temperature is 280°C, the pressure is 3.0MPa, and the raw material gas is H 2 / CO=2.0 (molar ratio), the space velocity is 5000h -1 , and the cycle ratio is 2.0.

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Abstract

The invention discloses a reduction method for an iron-based catalyst for Fischer-Tropsch synthesis in a fixed bed. The method comprises the following steps: adding the iron-based catalyst into a fixed bed reactor; and introducing gaseous hydrocarbon or mixed gas of hydrogen and gaseous hydrocarbon into the fixed bed reactor for reduction reaction to reduce the iron-based catalyst. The reduction method has the advantages that (1) the reduced catalyst has a little carbon deposit, so the catalyst has high activity and stability; (2) the product selectivity of the catalyst can be effectively modulated, and the selectivity for C5-30 in products is high; and (3) the reduced catalyst has a little carburization, so the catalyst has high wear resistance.

Description

technical field [0001] The invention relates to a reduction method of a fixed-bed Fischer-Tropsch synthesis iron-based catalyst. Background technique [0002] Fischer-Tropsch synthesis refers to the process of converting synthesis gas into oil and chemicals under the action of a catalyst. my country is a country with more coal and less oil. Petroleum resources are relatively scarce. In order to meet the needs of vehicle fuel and chemicals, my country needs to import a large amount of petroleum every year. In recent years, my country's dependence on foreign oil has exceeded 50%, seriously affecting national energy security. Using coal as the source to prepare synthesis gas, and then converting the synthesis gas into oil and chemicals through the Fischer-Tropsch synthesis reaction can transform my country's abundant coal resources into extremely scarce fuels, greatly alleviating the national energy security situation. [0003] Commonly used catalysts for Fischer-Tropsch syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/16B01J37/18B01J23/83B01J23/86B01J23/78B01J23/885B01J8/02C10G2/00
Inventor 王洪青明白云坡郑林王珏王缠和杨勇李永旺
Owner SYNFUELS CHINA TECH CO LTD
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