Preparation method of ethylene tar-based porous carbon with narrow aperture distribution

A technology of ethylene tar and porous carbon, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of difficult template removal, complicated operation, high cost, and achieve favorable electrochemical performance, wide range of sources, high cost, etc. The effect of increasing added value

Inactive Publication Date: 2017-05-17
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used templates include silicon templates and alumina templates. However, these templates are difficult to remove, and the operation is complicated and costly.

Method used

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  • Preparation method of ethylene tar-based porous carbon with narrow aperture distribution
  • Preparation method of ethylene tar-based porous carbon with narrow aperture distribution
  • Preparation method of ethylene tar-based porous carbon with narrow aperture distribution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of carbonaceous precursor: 10g of ethylene tar was dissolved in 600ml of n-heptane, heated to 120°C, refluxed for 5 hours, filtered, and the filter cake was dried in an oven at 80°C for 2 hours. Take 5 g of the above solid and dissolve it in 35 mL of concentrated sulfuric acid with a mass fraction of 98%, slowly add 15 mL of concentrated nitric acid with a mass fraction of 37%, and react for 60 minutes under stirring at room temperature. The oxidized liquid was transferred to 1L of water, filtered, and dried at 70° C. for 3 hours, and the obtained oxidized product was the precursor of the porous carbon material.

[0030] Preparation of porous carbon: Dissolve 1 g of carbon precursor in 800 mL of 0.34 mol / L sodium hydroxide solution, and drop into 300 mL of 0.3 mol / L magnesium sulfate solution under vigorous stirring. After standing overnight, the supernatant was removed, centrifuged and dried to obtain a co-precipitate of the carbonaceous precursor and magne...

Embodiment 2

[0034] Carbonaceous precursor preparation: The carbonaceous precursor was prepared according to the method described in Example 1.

[0035]Porous carbon preparation: Dissolve 1 g of carbon precursor in 500 mL of 0.6 mol / L sodium hydroxide solution, and drop into 650 mL of 0.15 mol / L magnesium nitrate solution under vigorous stirring. Let stand overnight. The supernatant was removed, centrifuged, and dried to obtain a co-precipitate of the carbonaceous precursor and magnesium hydroxide. The above co-precipitate was placed in a tube furnace, and the temperature was raised to 700°C at a rate of 7°C / min in an argon atmosphere, and kept for 1 hour to obtain a mixture of porous carbon and magnesium oxide. The above mixture was washed with 350 mL of 0.25 mol / L nitric acid solution to remove the template agent magnesium oxide, then rinsed with deionized water, and dried at 120° C. for 2 hours to obtain the target product. Test method is with embodiment 1, appended image 3 Its nitr...

Embodiment 3

[0037] Carbonaceous precursor preparation: The carbonaceous precursor was prepared according to the method described in Example 1.

[0038] Porous carbon preparation: Dissolve 1 g of carbon precursor in 300 mL of potassium hydroxide solution with a concentration of 1 mol / L, and add dropwise 2 L of magnesium chloride solution with a concentration of 0.05 mol / L under vigorous stirring. Let stand overnight. The supernatant was removed, centrifuged, and dried to obtain a co-precipitate of the carbonaceous precursor and magnesium hydroxide. The above co-precipitate was placed in a tube furnace, and the temperature was raised to 800°C at a rate of 7°C / min in an argon atmosphere, and kept for 2 hours to obtain a mixture of porous carbon and magnesium oxide. The above mixture was washed with 250 mL of 1 mol / L hydrochloric acid solution to remove the template agent magnesium oxide, then rinsed with deionized water, and dried at 120° C. for 2 hours to obtain the target product. Test m...

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Abstract

The invention provides a method for preparing porous carbon from ethylene tar, and belongs to the field of advanced processing of petrochemical byproducts. The method comprises the following steps: preprocessing and pre-oxidizing ethylene tar, and uniformly dispersing the pre-oxidized ethylene tar in an alkali solution with a certain concentration; dropwise adding a magnesium precursor to the above obtained colloid, standing the obtained mixture overnight, carrying out centrifuge and drying to obtain a carbon precursor and template agent coprecipitate, and carrying out high-temperature charring and pickling in inert atmosphere to obtain the target product. The in-situ template synthesis method provided by the invention realizes homogeneous mixing of the precursor and the template and regeneration of the pickled template and also realizes the material circulation of the whole technology, and the prepared porous carbon has narrow aperture distribution, has a specific surface area reaching 1620 m<2> / g, has a specific capacitance reaching 260 F / g, can be used as an energy storage material and an electrode material, and realizes high-added value utilization of the ethylene tar.

Description

technical field [0001] The invention relates to a preparation method of ethylene tar-based porous carbon, which belongs to the field of deep processing of petrochemical by-products. Background technique [0002] Porous carbon has large specific surface area, complex pore size distribution, good electrical conductivity, stable physical and chemical properties, and is often used as adsorption, energy storage and electrode materials. The preparation process and precursors are the main factors affecting the quality of porous carbons. In terms of raw materials, biomass raw materials such as rice husk and lignin, and mineral raw materials such as coal tar, pitch, needle coke, and petroleum coke have all been reported as precursors for the preparation of porous carbon. The raw material selected in the present invention-ethylene tar is a by-product of the ethylene industry, which has a wide range of sources and high carbon content. At present, only a small part is used to extract ...

Claims

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Application Information

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IPC IPC(8): C01B32/33
Inventor 朴明俊牛雁
Owner CHANGCHUN UNIV OF TECH
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