Iron group fischer-tropsch synthesis catalyst and its preparation method

An iron-based catalyst, Fischer-Tropsch synthesis technology, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, physical/chemical process catalysts, etc., can solve problems such as high water-gas shift activity, achieve low CO2 selectivity, good mechanical Strength and hydrothermal stability, the effect of simple preparation method

Active Publication Date: 2012-03-21
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Abstract
  • Description
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Problems solved by technology

[0008] It can be seen that in the existing iron-based catalyst formulation, the potassium promoter can well inhibit the methane formation reaction, but has a high water gas shift activity

Method used

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  • Iron group fischer-tropsch synthesis catalyst and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 76 kg of ferric nitrate nonahydrate, 0.2 kg of copper nitrate trihydrate, and 0.052 kg of lithium nitrate were dissolved in deionized water to prepare 2100 liters of solution. Dissolve 43 kilograms of anhydrous sodium carbonate with deionized water to make 400 liters of solution. Preheat the above-mentioned mixed salt solution of iron, copper and lithium and sodium carbonate solution to 50°C, co-precipitate into the reaction kettle within 40 minutes, adjust the pH value of the precipitation to 6, and let the precipitation stand for 60 minutes for aging , after aging, filter and wash to obtain a co-precipitation filter cake. 1.27 kg SiO 2 with K 2 O weight ratio 5:1, SiO 2 20% potassium silicate solution with 5.46 kg SiO 2 After the silica sol with a content of 5% is mixed, it is poured into the co-precipitation filter cake and mixed evenly. After the pH of the sizing liquid is 5 and soaked at 20°C for 50 minutes, the solid content of the sizing liquid is about 20%,...

Embodiment 2

[0039] 76 kg of ferric nitrate nonahydrate, 1.2 kg of copper nitrate trihydrate, and 1.04 kg of lithium nitrate were dissolved in deionized water to prepare 530 liters of solution. Dissolve 43 kilograms of anhydrous sodium carbonate with deionized water to prepare 200 liters of solution. Preheat the mixed solution of iron, copper and lithium metal salts and sodium carbonate solution to 65°C, co-precipitate into the reaction kettle within 30 minutes, adjust the pH value of the precipitation to 7, and leave it to age for 50 minutes after the precipitation is completed. After aging, filter and wash to obtain a co-precipitation filter cake. 3.51 kg SiO 2 with K 2 O weight ratio 4.15:1, SiO 2 The potassium silicate solution with a content of 30% is poured into the co-precipitation filter cake and mixed evenly. The pH of the sizing solution is 6, and after immersing at 30°C for 40 minutes, the solid content of the sizing liquid is about 30%, and the catalyst slurry is sent to th...

Embodiment 3

[0041] 76 kg of ferric nitrate nonahydrate, 2.2 kg of copper nitrate trihydrate, and 5.19 kg of lithium nitrate were dissolved in deionized water to prepare 300 liters of solution. Dissolve 43 kg of anhydrous sodium carbonate with deionized water to prepare 135 liters of solution. Preheat the mixed solution of iron, copper, lithium metal salts and sodium carbonate solution to 80°C, co-precipitate into the reactor within 20 minutes, adjust the pH value of the precipitation to 8, and leave it for 40 minutes to age after the precipitation. After aging, filter and wash to obtain a co-precipitation filter cake. 6.32 kg SiO 2 with K 2 O weight ratio 2.4:1, SiO 2 The potassium silicate solution with a content of 25% is poured into the co-precipitation filter cake and mixed evenly. The pH of the sizing liquid is 6, and after immersion at 40°C for 30 minutes, the solid content of the sizing liquid is about 25%, and the catalyst slurry is sent to the spray dryer under the conditions...

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Abstract

The invention relates to an iron group fischer-tropsch synthesis catalyst and its preparation method. The iron group fischer-tropsch synthesis catalyst comprises the components of Fe, Cu, K, Li and SiO2 with weight proportion of 100:0.1-15:0.1-10:0.05-10:2-50. On the premise of good fischer-tropsch synthesis activity and methane selectivity, the iron group fischer-tropsch synthesis catalyst is capable of reducing water gas shift reaction activity in a system and enhancing the effective utilization rate of CO reaction gas.

Description

technical field [0001] The invention relates to a Fischer-Tropsch synthesis process, more specifically, an iron-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. Background technique [0002] In the 1920s, German scientists F.Fischer and H.Tropsch discovered a method for synthesizing hydrocarbons or oxygenated compounds from synthesis gas under the action of iron or cobalt catalysts. Since then, people have called the method of producing various hydrocarbons and oxygen-containing organic compounds from syngas as Fischer-Tropsch (F-T) synthesis. [0003] The preparation methods of iron-based catalysts mainly include precipitation method and melting method. Among them, the catalyst prepared by melting method has low specific surface area and low activity, but high mechanical strength, which is suitable for high-temperature Fischer-Tropsch synthesis process using fluidized bed reactor. The catalyst prepared by the precipitation method has a high speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C10G2/00
Inventor 吴秀章林泉王鹏门卓武吕毅军
Owner CHNA ENERGY INVESTMENT CORP LTD
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