Precipitation iron-based Fischer-Tropsch synthesis catalyst and preparation method thereof

A technology for synthesis of catalysts and tropes, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, heterogeneous catalyst chemical elements, etc., can solve the problem of low selectivity of long-chain hydrocarbon products, low wear resistance, easy wear, etc. problems, to achieve the effect of reducing overall operating costs, good physical wear performance, and avoiding structural damage

Active Publication Date: 2018-05-25
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the low wear resistance of existing precipitated iron-based Fischer-Tropsch synthesis catalysts and the low selectivity of long-chain hydrocarbon products when used in slurry bed Fischer-Tropsch synthesis reactions, and to provide a Precipitated iron-based Fischer-Tropsch synthesis catalyst, preparation method thereof, and slurry bed Fischer-Tropsch synthesis method
Therefore, in order to solve the problem that the precipitated iron-based catalyst is easy to wear or break during the slurry bed synthetic oil reaction process, it is necessary to start with the improvement of the internal phase structure of the catalyst, so that it can be used in the fresh catalyst sample to the pre-reduction activation process. , and in the subsequent Fischer-Tropsch synthesis reaction process can have a stronger phase structure and inner pore characteristics, it is possible to fundamentally solve the above-mentioned wear problem, and can meet the requirements of long-term, high-load slurry bed Fischer-Tropsch Synthetic Oil Process Requirements

Method used

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  • Precipitation iron-based Fischer-Tropsch synthesis catalyst and preparation method thereof
  • Precipitation iron-based Fischer-Tropsch synthesis catalyst and preparation method thereof
  • Precipitation iron-based Fischer-Tropsch synthesis catalyst and preparation method thereof

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preparation example Construction

[0069] The present invention also provides a slurry-bed Fischer-Tropsch synthesis method, which comprises: performing Fischer-Tropsch synthesis reaction on synthesis gas containing CO and hydrogen in the presence of the above-mentioned precipitated iron-based Fischer-Tropsch synthesis catalyst.

[0070] The Fischer-Tropsch synthesis reaction can be implemented in a conventional slurry bed reactor. The conditions of the Fischer-Tropsch synthesis reaction can adopt conventional Fischer-Tropsch synthesis reaction conditions.

[0071] Technical effect of the present invention is as follows:

[0072] (1) The phase structure of the precipitated iron-based Fischer-Tropsch synthesis catalyst is mainly two-line hydrated iron oxide, mixed with a maghemite phase, and has between 960-980 / cm-1 in the infrared absorption spectrum The Fe-O-Si bridging characteristic peaks combined with chemical bonds greatly enhanced the dispersion of Fe species grains in the fresh catalyst samples.

[007...

Embodiment 1

[0088] This example is used to illustrate the precipitated iron-based Fischer-Tropsch synthesis catalyst provided by the present invention and its preparation method.

[0089] Weigh 22kg Fe(NO 3 ) 3 9H 2 O and 0.34kg Cu(NO 3 ) 2 ·3H 2 O, add 75L of deionized water and stir to dissolve, fully stir to obtain a mixed solution of iron salt and copper salt. Weigh 11kg Na 2 CO 3 (sodium source and precipitation agent) and 0.34kg potassium-containing silica sol (silicon content is 25.3% by weight, the first potassium source and the first silicon source), add 50L deionized water stirring and dissolving to obtain sodium source, the first potassium source, the second A mixed solution of silicon source and precipitant. The above two mixed solutions are respectively heated to above 65°C by means of jacket heating, and are respectively fed into the vigorously stirred precipitation reactor in parallel by using a transfer pump, and coprecipitate is formed through reaction. The volum...

Embodiment 2

[0099] This example is used to illustrate the precipitated iron-based Fischer-Tropsch synthesis catalyst provided by the present invention and its preparation method.

[0100] Weigh 22kg Fe(NO 3 ) 3 9H 2 O and 0.44kg copper nitrate, add 78L deionized water and stir to dissolve, fully stir, obtain the mixed solution of iron salt and copper salt. Weigh 2.2kg Na 2 CO 3 (sodium source and precipitation agent), 8.6kg potassium carbonate (a part of the first potassium source), 2.0kg potassium bicarbonate (another part of the first potassium source) and 0.28kg silica sol (the first silicon source), add 50L to The ionized water is stirred and dissolved to obtain a mixed solution of the sodium source, the first potassium source, the first silicon source and the precipitating agent. The above two mixed solutions were heated to above 55°C by means of jacket heating, respectively, and fed into the vigorously stirred precipitation reactor in parallel by using transfer pumps, and copre...

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Abstract

The invention relates to the field of Fischer-Tropsch synthesis reaction, and discloses a precipitation iron-based Fischer-Tropsch synthesis catalyst and a preparation method thereof. The precipitation iron-based Fischer-Tropsch synthesis catalyst is prepared from Fe, Cu, K, Na and SiO2 according to a weight ratio of 100:(0.1 to 6):(0.6 to 6):(0 to 1):(5 to 24), wherein the Fe mainly exists in thetwo-line hydrated iron oxide phase and is mixed with material phases of alpha-Fe2O3 and gamma-Fe2O3; the Cu, K and Na respectively exist in an oxide form; chemical bond combination Fe-O-Si bridging feature peaks exist between infrared adsorption spectrums 960 to 980 cm<-1>. The precipitation iron-based Fischer-Tropsch synthesis catalyst provided by the invention has higher anti-chemical-abrasionintensity and anti-physical-abrasion intensity. When the catalyst is used for slurry state bed Fischer-Tropsch synthesis reaction, the service life is longer; the selectivity on the long-chain hydrocarbon heavy-weight products (such as C5+ products) is obviously and greatly enhanced; the methane selectivity and the C2 to C4 lighter hydrocarbon product selectivity can be reduced.

Description

technical field [0001] The present invention relates to the field of Fischer-Tropsch synthesis reaction, in particular to a precipitated iron-based Fischer-Tropsch synthesis catalyst, a method for preparing the precipitated iron-based Fischer-Tropsch synthesis catalyst, a precipitated iron-based Fischer-Tropsch synthesis catalyst prepared by the method, and the use of The invention relates to a slurry bed Fischer-Tropsch synthesis method of the precipitated iron-based Fischer-Tropsch synthesis catalyst. Background technique [0002] In the application and development process of Fischer-Tropsch (F-T) synthetic precipitated iron-based catalysts, so far, among the numerous catalyst formulations and preparation methods, the composition and preparation process from Ruhrchemie A.G., Germany, namely 100Fe / 5Cu / 4.2K / 25SiO2 2 Formulation (Frohning, C.D.; H. Ralek, M.; Rottig, W.; Schuur, F.; Schulz, H., Fischer-Tropsch-Synthese, in J. Falbe, ed., Chemierohstoffe aus Kohle, Georg T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C10G2/00
CPCB01J23/002B01J23/78B01J2523/00C10G2/332C10G2300/70B01J2523/12B01J2523/13B01J2523/41B01J2523/842B01J2523/17
Inventor 常海吕毅军孙守理缪平刘庆华冯波马琳鸽武鹏
Owner CHNA ENERGY INVESTMENT CORP LTD
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