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A kind of preparation method of core-shell type iron carbide catalyst

A core-shell type catalyst technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high selectivity, low activity, high temperature and easy deactivation of high-carbon linear alkanes, etc. Achieve the effect of high low carbon olefin selectivity, high CO conversion rate, low methane and carbon dioxide selectivity

Active Publication Date: 2019-02-26
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of existing Fischer-Tropsch synthesis catalysts, such as high selectivity, low activity, and easy deactivation of high-carbon linear alkanes, to provide a core-shell iron carbide catalyst and a preparation method thereof

Method used

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  • A kind of preparation method of core-shell type iron carbide catalyst
  • A kind of preparation method of core-shell type iron carbide catalyst

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Experimental program
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Effect test

Embodiment 1

[0031] (1) The ZSM-5 molecular sieve after drying at 120°C and dewatering was ion-exchanged with 0.5mol / L K 2 CO 3 The solution (liquid-solid ratio 25mL / g) was treated at room temperature for 4h, then washed with deionized water, and dried at 120°C for 12h to obtain the alkali-treated ZSM-5 molecular sieve.

[0032] (2) Take 12.625g Fe(NO 3 ) 3 ·9H 2 O was dissolved in 30ml of distilled water, stirred for 30min, and then added dropwise ammonia water to adjust the pH of the solution to 10, and left to stand for aging for 12h; then suction filtered and washed until the pH of the filtrate was 7, and the filter cake was dried in an oven at 120 °C for 24h and then ground to 60 mesh or more. Iron oxide particles were prepared.

[0033] (3) Molecular sieve and aluminum sol (3g in total) were weighed and dissolved in 20ml absolute ethanol by mass ratio of 1:2, stirred for 30min and then ultrasonicated for 2h to obtain spray solution; For iron particles, take a small amount of spr...

Embodiment 2

[0037] (1) The HZSM-5 molecular sieve after drying and removing water at 120°C was ion-exchanged with 0.5mol / L K 2 CO 3 The solution (liquid-solid ratio 25mL / g) was treated at room temperature for 4h, then washed with deionized water, and dried at 120°C for 12h to obtain the alkali-treated HZSM-5 molecular sieve.

[0038] (2) Take 12.625g Fe(NO 3 ) 3 9H 2 O and 0.158 g KNO 3 Dissolve in 30ml of distilled water, stir for 30 minutes, add ammonia water dropwise to adjust the pH of the solution to 10, and let it stand for aging for 12 hours; then filter and wash until the pH of the filtrate is about 7, dry the filter cake in an oven at 120°C for 24 hours, and then grind it to more than 60 mesh. Potassium-doped modified iron oxide particles were prepared.

[0039] (3) Weigh molecular sieve and aluminum sol (3g in total) according to the mass ratio of 1:2 and dissolve them in 20ml of absolute ethanol, stir for 30min and then ultrasonicate for 2h to obtain the spraying liquid; w...

Embodiment 3

[0043] (1) The ZSM-5 molecular sieve after drying and removing water at 120°C is ion-exchanged with 0.5mol / L K 2 CO 3 The solution (liquid-solid ratio 25mL / g) was treated at room temperature for 4h, then washed with deionized water, and dried at 120°C for 12h to obtain the alkali-treated ZSM-5 molecular sieve.

[0044] (2) Take 12.625g Fe(NO 3 ) 3 9H 2 O and 0.158 g KNO 3 Dissolve in 30ml of distilled water, stir for 30 minutes, add ammonia water dropwise to adjust the pH of the solution to 10, and let it stand for aging for 12 hours; then filter and wash until the pH of the filtrate is about 7, dry the filter cake in an oven at 120°C for 24 hours, and then grind it to more than 60 mesh. Potassium-doped modified iron oxide particles were prepared.

[0045] (3) Weigh molecular sieve and aluminum sol (4g in total) according to the mass ratio of 2:2 and dissolve them in 20ml of absolute ethanol, stir for 30min and then ultrasonicate for 2h to obtain the spraying liquid; weig...

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Abstract

The invention relates to a core-shell type iron carbide catalyst and a preparation method thereof. According to the invention, iron carbide is combined with a molecular sieve, the iron carbide serves as the core, the molecular sieve serves as the shell, and the core-shell type iron carbide catalyst is prepared according to a simple and high-efficiency daubing method. A reaction of directly preparing low-carbon olefin through synthesis gas is carried out in a fixed bed micro reactor. The preparation method of the core-shell type iron carbide catalyst is simple and feasible, the methane and carbon dioxide selectivity can be relatively low while the CO conversion rate is relatively high, C2-C4 low-carbon olefins can be obtained at high selectivity, and no carbon deposit inactivation phenomenon is caused when the catalyst operates continuously and stably in a high-temperature Fischer-Tropsch synthesis reaction for 100 hours,.

Description

technical field [0001] The invention relates to a preparation method of a core-shell type Fischer-Tropsch synthesis reaction catalyst and its application in the Fischer-Tropsch synthesis reaction, in particular to a solid catalyst with a core-shell structure for directly preparing low-carbon olefins in the Fischer-Tropsch synthesis reaction . Background technique [0002] Low-carbon olefins mainly refer to ethylene, propylene and butylene, which are an important standard for measuring the level of a country's chemical industry, and are also important basic chemical raw materials, which are mainly obtained from petroleum as raw materials. As of 2015, my country's ethylene and propylene production capacity is expected to reach 24.3 million tons and 21 million tons, the gap between supply and demand is still 13.7 million tons and 7 million tons, and the contradiction between supply and demand in the future is still very prominent. Furthermore, due to the non-renewable nature o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46C10G2/00
CPCB01J29/46B01J2229/38B01J2229/40C10G2/334
Inventor 刘勇军李志峰徐红波
Owner HUAQIAO UNIVERSITY