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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, excessive carbon deposition on the catalyst, and affecting catalyst activity. Achieve the effect of strong anti-wear ability, less carbon deposition on the catalyst, and less carburization of the catalyst

Active Publication Date: 2013-05-01
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 a fixed bed reactor, the catalyst composition is 100Fe / 10Ce / 5Cu / 6K / 30SiO 2 (For the mass ratio). Pass 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 rises from room temperature to 360°C at a temperature rise rate of 10°C / h and then keeps constant temperature for 6 hours. Decrease the reduction temperature to 320°C at 10°C / h and switch the reducing atmosphere to H 2 / C 2 H 4 (Mole ratio is 20:1) mixed gas, space velocity 3000h -1 , The recycle ratio is 5, and the reduced iron-based catalyst is obtained by keeping the temperature at 320°C in this atmosphere for 20 hours, which is marked as A.

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

Embodiment 2

[0035] Load 10g of Fischer-Tropsch synthesis iron-based catalyst into a fixed bed reactor, the catalyst composition is 100Fe / 5La / 3Cu / 1Rb / 30Al 2 O 3 (For the mass ratio). Pass 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, the reactor rises from room temperature to 260°C at a heating rate of 5°C / h, and then keeps constant for 24 hours. Switch the reducing atmosphere to H 2 / C 3 H 8 (Mole ratio is 10:1) mixed gas, space velocity 500h -1 , The circulation ratio is 10, and the reduced iron-based catalyst is obtained by keeping the temperature at 260°C in this atmosphere for 48 hours, which is denoted as B.

[0036] After the reduction, the reactor is adjusted to the reaction conditions for Fischer-Tropsch synthesis reaction. The reaction conditions are: temperature 270°C, pressure 3.0MPa, raw material gas H 2 / CO=1.2 (molar ratio), space velocity is 5000h -1 , The cycle ratio is 2.0.

Embodiment 3

[0038] Load 10g of Fischer-Tropsch synthesis iron-based catalyst into a fixed bed reactor, the catalyst composition is 100Fe / 3Cr / 1K / 15SiO 2 (For the mass ratio). To the fixed bed reactor H 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 (that is, the tail gas is not circulated), and the reactor rises from room temperature to 280°C at a heating rate of 10°C / h, and then keeps constant for 30 hours. The reduced iron-based catalyst is obtained, denoted as C.

[0039] After the reduction, the reactor is adjusted to the reaction conditions for Fischer-Tropsch synthesis reaction. The reaction conditions are: temperature is 280°C, pressure is 3.0MPa, raw gas is H 2 / CO=2.0 (molar ratio), space velocity is 5000h -1 , 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] The Fischer-Tropsch synthesis reaction refers to the process of converting syngas 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 small. To meet the demand for vehicle fuels 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%, which has seriously affected the national energy security. Using coal as the source to prepare synthesis gas, and then funding synthesis reaction to convert the synthesis gas into oil and chemicals can convert my country's abundant coal resources into extremely scarce fuels, greatly alleviating the national energy security situation. [0003] The commonly used catalysts for Fischer-Tropsch synthesis reacti...

Claims

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Application Information

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Patent Type & Authority Applications(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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