Preparation method of Fischer-Tropsch synthesis precipitated iron catalyst

A technology of Fischer-Tropsch synthesis and catalysts, which is applied in the preparation of liquid hydrocarbon mixtures, chemical instruments and methods, and catalysts for physical/chemical processes. It can solve the problems of inability to control the physical and chemical properties of catalysts, and achieve chemical stability and physical wear control. Effect

Active Publication Date: 2012-09-12
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Application Information

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Problems solved by technology

[0008] The present invention aims to provide a Fischer-Tropsch synthesis precipitated iron catalyst and its preparation method to solve the technical problem that the preparation method of the Fischer-Tropsch synthesis precipitated iron catalyst in the prior art cannot regulate the physical and chemical properties of the catalyst in a larger range

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  • Preparation method of Fischer-Tropsch synthesis precipitated iron catalyst

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preparation example Construction

[0021] According to a typical implementation of the present invention, the preparation method of the Fischer-Tropsch synthesis precipitated iron catalyst comprises the following steps: 1) Feed the iron salt solution, the first auxiliary salt solution, the precipitant solution and the silicon compound solution into the In the precipitation reactor, a co-precipitation reaction is carried out to obtain a precipitation slurry; 2) the precipitation slurry is filtered and washed to obtain a catalyst precursor filter cake, and the catalyst precursor filter cake is slurried to obtain a catalyst precursor slurry ; 3) carry out co-current reaction with silicon compound solution and nitric acid solution to obtain silica sol; 4) mix catalyst precursor slurry with silica sol, and filter to obtain filter cake; 5) use deionized water or deionized The mixed solution of water and the second auxiliary agent salt solution reslurries the filter cake to obtain a catalyst slurry; and 6) spray-dries,...

Embodiment 1

[0059]Add 20Kg of deionized water to catalyst precursor filter cake 2, and beat for 0.5-1 hour under high-speed stirring. Silica sol 1 was left to stand for 10 minutes after the reaction, added to the slurry, mixed under high-speed stirring for 20 minutes, and then filtered. The obtained filter cake was reslurried with a certain amount of deionized water containing 0.049 Kg of cobalt nitrate, and the stirring was continued for 25 minutes to obtain a catalyst slurry. The catalyst slurry was input into a spray dryer, and spray-dried under the condition that the inlet air temperature was 290°C and the outlet air temperature was 105°C. The obtained microsphere catalyst is heated up to 150°C at 600°C / h in a muffle furnace, kept at this temperature for 7 hours, then raised to 450°C at a rate of 300°C / h, and kept at 450°C for 6 hours to obtain the final catalyst. Good sphericity and surface topography.

Embodiment 2

[0061] Add 20Kg of deionized water to catalyst precursor filter cake 2, and beat for 0.5-1 hour under high-speed stirring. Silica sol 2 was left to stand for 1 hour after the reaction, and then added to the slurry while controlling the mixing temperature at 25°C and mixing for 25 minutes under high-speed stirring. The pH value is adjusted to be about 8 by adding ammonia water, and the adding time is controlled to be 50 minutes, and then filtering is performed. The obtained filter cake was reslurried with a certain amount of deionized water containing 0.055Kg of cobalt nitrate and 0.018Kg of potassium nitrate, and the stirring was continued for 35 minutes to obtain a catalyst slurry. The catalyst slurry was input into a spray dryer, and spray-dried under the condition that the inlet air temperature was 290°C and the outlet air temperature was 105°C. The obtained microsphere catalyst is heated in a muffle furnace at a rate of 500°C / h to 150°C, kept at this temperature for 10 ho...

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Abstract

The invention discloses a preparation method of a Fischer-Tropsch synthesis precipitated iron catalyst. The method comprises the following steps: preparing a precipitation slurry through a coprecipitation reaction; 2, filtering, washing and slurrying the precipitation slurry to obtain a catalyst precursor slurry; 3, carrying out a concurrent flow reaction on a silicon compound solution and a nitric acid solution to preparing a silicon sol; 4, mixing the catalyst precursor slurry with the silicon sol, and filtering to prepare a filter cake; 5, slurrying the filter cake to obtain a catalyst slurry; and 6, carrying out spray drying shaping and roasting on the catalyst slurry to obtain the Fischer-Tropsch synthesis precipitated iron catalyst. The preparation method of the Fischer-Tropsch synthesis precipitated iron catalyst of the invention has the advantages of flexible control of the specific surface area and the pore volume of the catalyst in a wide range according to experiment requirements, good control of the physical abrasion of the catalyst in a low level according to different preparation conditions, and simultaneous guarantee of the chemical stability of the catalyst.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a preparation method of a Fischer-Tropsch synthesis precipitated iron catalyst. Background technique [0002] Fischer-Tropsch synthesis was first discovered by German chemists Fischer and Tropsch in the 1920s. It is a synthesis gas (CO+H 2 ) The reaction of synthesizing hydrocarbon compounds through the catalysis of catalysts. In the 1950s, South Africa realized the large-scale industrial production of Fischer-Tropsch synthesis. After the initial fixed bed reactor, circulating fluidized bed reactor and fixed fluidized bed reactor, the latest slurry was applied in the 1990s. state bed reactor. The slurry bed has high production efficiency, good reaction heat transfer, uniform temperature, and is suitable for low hydrogen-carbon ratio (H 2 / CO) synthesis gas, the advantages of convenient catalyst loading and unloading, and it is precisely because of the above advantages that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/78B01J23/89B01J35/10C10G2/00
Inventor 程萌常海朱加清常鸿雁程时富
Owner CHNA ENERGY INVESTMENT CORP LTD
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