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Iron-based catalyst used in preparation of low-carbon olefin from synthetic gas, and preparation method and application thereof

A technology for iron-based catalysts and low-carbon olefins, which is applied in catalyst activation/preparation, carbon compound catalysts, catalysts, etc., can solve problems to be further improved, and achieves favorable conditions for large-scale production and application, low energy consumption, and preparation conditions. mild effect

Active Publication Date: 2017-02-08
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activity and stability of these catalysts modified on silica gel support still need to be further improved for long-term operation.

Method used

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  • Iron-based catalyst used in preparation of low-carbon olefin from synthetic gas, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 73.6g of aluminum nitrate and 29.4g of urea, dissolve them in 20mL of distilled water and place them in a water bath at 60°C to heat and stir evenly, then pour the solution into a ceramic evaporating dish and place it in an air atmosphere in a muffle furnace at 500°C Spontaneously ignite after heating, and continue to maintain for 20 minutes to take out the solid product after combustion, and grind the product after cooling to obtain powder α-Al with a mesh size greater than 200 mesh 2 o 3 About 10g.

[0022] Weigh 4.1g of ferric nitrate, 0.21g of sodium nitrate and 1.5g of urea and dissolve in 2.5mL of distilled water to obtain a mixed solution, and weigh the prepared α-Al 2 o 3 5g of the carrier was slowly added into the above mixed solution under stirring condition and dipped and stirred for 12 hours for later use. Pour the impregnation solution prepared above into a ceramic evaporating dish, place it in an air atmosphere in a muffle furnace and heat it at 4...

Embodiment 2

[0026] Weigh 73.6g of aluminum nitrate and 29.4g of urea, dissolve them in 20mL of distilled water, put them in a water bath, heat and stir at 60°C, then pour the solution into a ceramic evaporating dish, place it in an air atmosphere in a muffle furnace, and heat at 450°C Spontaneously ignite and keep for 20 minutes, take out the solid product after cooling, and grind the product after cooling to obtain a powder α-Al with a mesh size greater than 200 mesh 2 o 3 About 10g.

[0027] Weigh 4.1g of ferric nitrate, 0.15g of potassium nitrate and 1.5g of urea, add 2.5mL of distilled water to dissolve to obtain a mixed solution, weigh the prepared catalyst carrier α-Al 2 o 3 5g, slowly added to the above mixed solution under stirring condition and soaked and stirred for 12h for later use. Pour the above-prepared impregnating liquid into a ceramic evaporating dish, place it in an air atmosphere in a muffle furnace and heat it at 480°C to spontaneously ignite, and keep it for 20 m...

Embodiment 3

[0030] Weigh 73.6g of aluminum nitrate and 29.4g of urea, dissolve them in 20mL of distilled water, put them in a water bath, heat and stir at 60°C, then pour the solution into a ceramic evaporating dish, place it in an air atmosphere in a muffle furnace, and heat at 550°C Spontaneously ignite and keep for 20 minutes, take out the solid product after cooling, and grind the product after cooling to obtain a powder α-Al with a mesh size greater than 200 mesh 2 o 3 About 10g.

[0031] Weigh 6.5g of ferric nitrate, 0.15g of potassium nitrate, 0.11g of sodium nitrate and 2.6g of citric acid, add 4.5mL of distilled water to dissolve to obtain a mixed solution, weigh the prepared catalyst carrier α-Al 2 o 3 5g, slowly added to the above mixed solution under stirring condition and soaked and stirred for 12h for later use. Pour the impregnation solution prepared above into a ceramic evaporating dish, place it in an air atmosphere in a muffle furnace and heat it at 400°C to spontane...

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Abstract

The invention discloses a preparation method for an iron-based catalyst used in preparation of low-carbon olefin from synthetic gas. According to a concrete technical scheme in the invention, the preparation method comprises the following steps: preparing an alpha-Al2O3 carrier by using a solution combustion method; and loading an active component Fe and an auxiliary agent onto the alpha-Al2O3 carrier by using an impregnation combustion method so as to prepare the iron-based catalyst. The alpha-Al2O3 carrier prepared by using the method is in a cellular and fluffy shape and has a large specific surface area, abundant pore structures and high degree of crystallization; and the active component Fe is loaded on the carrier by using the impregnation combustion method, so the preparation flow and time for the catalyst are shortened, dispersion of the active component on the carrier is promoted, and catalytic activity is improved. When the prepared iron-based catalyst is applied to preparation of low-carbon olefin from synthetic gas via a fixed bed, the selectivity of produced low-carbon olefin is high while the selectivity of methane is low, and the olefin / paraffin (O / P) ratio of C2-4 components in the product is substantially increased.

Description

technical field [0001] The invention relates to an iron-based catalyst for producing low-carbon olefins from syngas, in particular to a loaded iron-based catalyst suitable for producing low-carbon olefins from syngas in a fixed-bed reactor and a preparation method. Background technique [0002] Light olefins are important chemical raw materials, and currently they mainly come from the cracking of naphtha. my country's oil resource reserves are small, consumption is large, and the dependence on foreign oil resources is constantly increasing. Coal gasification is used as the source to produce synthesis gas, and then the synthesis gas is directly produced by Fischer-Tropsch reaction to produce low-carbon olefins such as ethylene, propylene and butene. Alternative technologies are receiving increasing attention domestically. The development of this technical route is of great significance for utilizing my country's relatively abundant coal resources and alleviating dependence on...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J23/78C07C1/04C07C11/02
CPCC07C1/044B01J23/78B01J37/0203B01J37/08C07C2523/78B01J35/56C07C11/02
Inventor 孟凡会李忠程杨李鑫高源
Owner TAIYUAN UNIV OF TECH
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