Reduction method for a Fischer-Tropsch synthesis iron-based catalyst

An iron-based catalyst, Fischer-Tropsch synthesis technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., to achieve high activity, reduce wear, and prevent catalyst fragmentation.

Active Publication Date: 2017-09-12
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the invention is to solve the problem how to make the Fischer-Tropsch synthesis iron-based catalyst carry out the reduction reaction smoothly, to prevent the reaction from violently affecting the strength of the catalyst, and to prevent a large amount of water and CO from being generated 2 , so as to ensure that the obtained reduced catalyst is not easily broken, and has high activity, CO 2 and low-carbon hydrocarbon selectivity, providing a reduction method for Fischer-Tropsch synthesis of iron-based catalysts

Method used

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  • Reduction method for a Fischer-Tropsch synthesis iron-based catalyst
  • Reduction method for a Fischer-Tropsch synthesis iron-based catalyst
  • Reduction method for a Fischer-Tropsch synthesis iron-based catalyst

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Embodiment approach

[0039] According to a preferred embodiment of the present invention, the reducing gas contains fresh reducing gas and cycle gas; the fresh reducing gas contains hydrogen and CO.

[0040] In the present invention, the reducing gas is preheated through a preheater before being passed into the fixed fluidized bed reactor. Preheating can provide a heat source for the reduction reaction carried out in the fixed fluidized bed reactor, and ensure the temperature required by the temperature programming condition. That is to say, the preheating makes the reducing gas reach the temperature required for the reduction reaction, so as to ensure that the Fischer-Tropsch synthesis iron-based catalyst implements the reduction method of the Fischer-Tropsch synthesis iron-based catalyst of the present invention under the temperature-programmed condition of the present invention. The preheating is carried out according to the aforementioned temperature programming conditions, and the temperature...

preparation example 1

[0062] This preparation example illustrates the preparation of an iron-based catalyst for Fischer-Tropsch synthesis of the present invention.

[0063] Weigh 10.0kg of Fe(NO 3 ) 3 9H 2 O, 0.18kg of Cu(NO 3 ) 2 ·3H 2 O, add 32L deionized water and stir to dissolve to obtain a mixed solution of iron salt. Weigh 7.0kg of Na 2 CO 3 , Add 20L of deionized water and stir to dissolve to obtain an alkaline salt solution. Heat the above-mentioned iron salt mixed solution and alkaline salt solution to above 80°C respectively, and then add them into a vigorously stirred reaction tank, control the precipitation temperature in the reaction tank to 80°C, pH value to 7.5, stirring speed at 80rpm, and react for 40 minute. After the precipitation, the precipitated slurry was aged for 1 hour, vacuum filtered, and washed repeatedly with deionized water for 4 times to obtain a filter cake.

[0064] Add 3.5 kg of potassium silicate aqueous solution with a mass concentration of 20% to the ...

Embodiment 1

[0066] This example illustrates the reduction method of the Fischer-Tropsch synthesis iron-based catalyst of the present invention and the Fischer-Tropsch synthesis of the reduced catalyst.

[0067] (1) Add 300g of Catalyst-1 (100 μm in particle size) to a fixed fluidized bed reactor with an inner diameter of 50mm and a height of 800mm, and replace the air in the reactor with nitrogen; hot fresh reducing gas;

[0068] The reactor is boosted to 1.5MPa, and the temperature is raised according to the set program (as follows):

[0069] The heating conditions of the reduction reactor are as follows: the heating rate from normal temperature to 120°C is 15°C / h, and the constant temperature is 4h at 120°C; the heating rate is 6°C / h from 120°C to 230°C, and the constant temperature is 8h at 230°C; 4°C / h, constant temperature at 260°C for 12h;

[0070] The gas from the top of the reactor is condensed and cooled to separate oil and water, and then part of it is discharged directly as t...

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Abstract

The present invention relates to the field of Fischer-Tropsch synthesis iron-based catalyst reduction, and discloses a reduction method for a Fischer-Tropsch synthesis iron-based catalyst. The reduction method comprises: in the presence of a reducing gas, carrying out programmed heating reduction on Fischer-Tropsch synthesis iron-based catalyst particles in a fixed fluidized bed reactor, wherein the programmed heating reduction comprises that the heating rate is 10-20 DEG C / h and constant temperature treatment is performed for 2-8 h at a temperature of 120 DEG C when the temperature is from room temperature to 120 DEG C, the heating rate is 5-10 DEG C / h and constant temperature treatment is performed for 3-10 h at a temperature of 220-230 DEG C when the temperature is from 120 DEG C to (220-230) DEG C, and the heating rate is 3-5 DEG C / h and constant temperature treatment is performed for 10-30 h at a temperature of 260-280 DEG C when the temperature is from (220-230) DEG C to (260-280) DEG C. With the reduction method of the present invention, the Fischer-Tropsch synthesis iron-based catalyst can be smoothly subjected to the reduction reaction so as to reduce the influence on the water and the catalyst strength, and with the application of the reduced catalyst in the Fischer-Tropsch synthesis, the advantages of no breaking, high catalyst activity, low CO2 selectivity and low low-carbon hydrocarbon selectivity can be provided.

Description

technical field [0001] The invention relates to the field of reduction of Fischer-Tropsch synthesis iron-based catalysts, in particular to a reduction method of Fischer-Tropsch synthesis iron-based catalysts. Background technique [0002] Fischer-Tropsch synthesis refers to the synthesis gas (H 2 +CO), the process of synthesizing hydrocarbon liquid fuels in the presence of metal catalysts such as iron, cobalt, and ruthenium. Using a slurry bed reactor for Fischer-Tropsch synthesis reaction has many advantages such as uniform mixing of gas, liquid and solid phases, small pressure drop, good heat transfer effect, easy control of reaction temperature, and online update of the catalyst, so it has become a research and development and Follow hot spots. [0003] Fe-based catalysts for Fischer-Tropsch synthesis can use low H 2 The coal-based synthesis gas with / CO ratio can be directly used in the slurry bed Fischer-Tropsch synthesis reaction without prior conversion, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/18C10G2/00
CPCB01J37/18C10G2/332
Inventor 孟祥堃胡云剑门卓武王涛田博吕毅军李永龙孙守理
Owner CHNA ENERGY INVESTMENT CORP LTD
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