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FT synthesis sintered iron catalyst and preparation method and use thereof

A technology of molten iron catalyst and Fischer-Tropsch synthesis, which is applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, physical/chemical process catalysts, etc., and can solve problems such as low selectivity, high methane selectivity, and low space-time yield , to achieve the effects of simple process flow, high yield, good impact resistance and wear resistance

Active Publication Date: 2009-03-25
YANKUANG ENERGY R&D CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN1279142C invented a kind of main phase is Fe 3 o 4 molten iron Fischer-Tropsch synthesis catalyst to Al 2 o 3 , CaO, K 2 O, SiO 2 As a co-catalyst, the C of the catalyst 5+ low space-time yield
[0007] The above catalysts have high methane selectivity, olefins and C 5+ Disadvantages such as low selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 750kg of magnetite powder is mixed with 3.16kg of potassium carbonate, 3.69kg of sodium carbonate, 3.01kg of silicon dioxide, 0.72kg of alumina and 21.55kg of dolomite, and then put into the melting furnace. The electrodes are connected with 55kg iron bars, fused with electricity, the melting time is 3.5h, and the Fe is analyzed 3+ / 2Fe 2+ =0.8, the molten catalyst is put into the cooling pan for rapid cooling, the catalyst is crushed to obtain 789kg of semi-finished catalyst with particles less than 3mm, and then 655kg of finished catalyst is obtained through ultrafine grinding, and 134kg of fine powder is returned to the melting furnace for reuse as raw material. The above catalyst is named A, the catalyst skeleton density: 4.1g / mL bulk density: 2.3g / mL; BET specific surface area 0.5m 2 / g, pore volume: 0.06ml / g, average particle size: 50μm.

Embodiment 2

[0034] Mix 800kg of magnetite powder with 3.59kg of potassium carbonate, 5.08kg of sodium carbonate, 3.40kg of silicon dioxide, 0.73kg of alumina, and 22.5kg of dolomite, and then put it into the melting furnace. The electrodes are connected with 35kg iron bars, fused with electricity, the melting time is 3.5h, and Fe is analyzed 3+ / 2Fe 2+ =1.2, the molten catalyst is put into the cooling pan for rapid cooling, the catalyst is crushed to obtain 850kg of semi-finished catalyst with particles less than 3mm, and then 730kg of finished catalyst is obtained through ultrafine grinding, and 120kg of fine powder is returned to the melting furnace for reuse as raw material. The above catalyst is named B, the catalyst skeleton density: 4.5g / mL bulk density: 2.2g / mL; BET specific surface area 0.1m 2 / g, pore volume: 0.08ml / g, average particle size: 55μm.

Embodiment 3

[0036] 800kg of magnetite powder is mixed with 4.07kg of potassium carbonate, 5.50kg of sodium carbonate, 3.60kg of silicon dioxide, 0.63kg of alumina and 21.9kg of dolomite, and then put into the melting furnace. The electrodes are connected with 25kg iron bars, fused with electricity, the melting time is 3.5h, and the Fe is analyzed 3+ / 2Fe 2+ =1.0, the molten catalyst is put into the cooling pan for rapid cooling, the catalyst is crushed to obtain 820kg of semi-finished catalyst with particles less than 3mm, and then 644kg of finished catalyst is obtained through ultrafine grinding, and 176kg of fine powder is returned to the melting furnace for reuse as raw materials. The above catalyst is named C, the catalyst skeleton density: 4.0g / mL bulk density: 2.8g / mL; BET specific surface area 2m 2 / g, pore volume: 0.06ml / g, average particle size: 60μm

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Abstract

The invention relates to a Fischer-Tropsch synthesis fused iron catalyst as well as a preparation method and an application thereof, the catalyst is an iron-based catalyst, the weight percentage of iron (Fe) is between 50 and 85 percent, and the weight ratio Fe<3+> / 2Fe<2+> of substance of ferric iron to that of bivalent iron which is two times the weight of ferric iron is 0.5 to 1.5, and the invention also includes a co-catalyst having the compositions: aluminum oxide (Al2O3) 0.1 to 1.5g / 100gFe, magnesium oxide (MgO) 0.1 to 1.5g / 100gFe, potassium oxide (K2O) 0.2 to 1.2g / 100gFe, sodium oxide (Na2O) 0.1 to 2g / 100gFe, calcium oxide (CaO) 0.1 to 1.5g / 100gFe, and silicon oxide (SiO2) 0.5 to 2g / 100gFe. Compared with the prior art, the catalyst has the advantages of high strength, low methane selectivity, high olefin selectivity, simple production process, low production cost and applicable mass production.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to designing a catalyst for a fluidized-bed Fischer-Tropsch synthesis reactor and a preparation method thereof. Background technique [0002] Fischer-Tropsch synthesis reaction (F-T Synthesis) is synthesis gas (CO+H 2 ) is the core process of conversion into hydrocarbon liquid fuels on the catalyst. Syngas is produced by reforming natural gas or by coal gasification. The Fischer-Tropsch synthesis reaction uses iron-based or cobalt-based catalysts. Generally speaking, cobalt-based catalysts are suitable for synthesis gas obtained from the conversion of natural gas, and iron-based catalysts are suitable for coal-based Fischer-Tropsch synthesis processes due to their good conversion activity and sulfur tolerance. [0003] The preparation methods of iron-based Fischer-Tropsch synthesis catalysts mainly include precipitation method and melting method. Since the catalyst p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C07C1/04C10G2/00
Inventor 孙启文蒋凡凯陈立才刘继森
Owner YANKUANG ENERGY R&D CO LTD
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