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Method for preparing porous carbon material by using magnesium oxide template in cooperation with activation of potassium hydroxide

A potassium hydroxide and magnesium oxide technology, which is applied in the field of preparing porous carbon materials with magnesium oxide template and potassium hydroxide activation, can solve the problems of high cost, high energy consumption, long time consumption, etc., and achieves improved yield, promoted formation, Large and easy-to-get effects

Active Publication Date: 2013-07-24
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the conventional activation method takes a long time, consumes a lot of energy, and costs a lot

Method used

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  • Method for preparing porous carbon material by using magnesium oxide template in cooperation with activation of potassium hydroxide
  • Method for preparing porous carbon material by using magnesium oxide template in cooperation with activation of potassium hydroxide
  • Method for preparing porous carbon material by using magnesium oxide template in cooperation with activation of potassium hydroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Porous Carbon PC 4.2-16.8-6 The specific preparation process is as follows:

[0022] (1) Pretreatment of coal tar pitch: The coal tar pitch is ground to a particle size of less than 74 μm to obtain the pretreated coal tar pitch. The air drying base moisture of the obtained coal tar pitch is 1.13%, the ash content is 0.16%, the volatile matter is 57.5%, and the carbon is fixed. is 41.21%, and the softening point is 110°C.

[0023] (2) Grinding of reactants: Weigh 4.2 g of the pretreated coal tar pitch obtained in step (1) into a mortar, add 16.8 g of magnesium oxide with a particle size of 50 nm, add 6 g of solid potassium hydroxide, and grind the mixture of the three. The reaction was obtained after 1 h.

[0024](3) Preparation of porous carbon: move the reactant raw material obtained in step (2) into a corundum crucible, place the corundum crucible in a microwave chemical reactor, and place a nitrogen bottle, quartz protective cover, corundum crucible, the...

Embodiment 2

[0026] Example 2: Porous Carbon PC 7-14-6 The specific preparation process is as follows:

[0027] (1) Pretreatment of coal tar pitch: It was implemented by the same method as the step (1) in Example 1.

[0028] (2) Carry out the same method as step (2) in Example 1, except that the weighed coal tar pitch is 7 g, the magnesium oxide is 14 g, and the potassium hydroxide is 6 g.

[0029] (3) The same method as step (3) in Example 1 was carried out.

[0030] (4) Carry out the same method as step (4) in Example 1, except that the amount of 2M dilute sulfuric acid added is 300 mL, and the obtained porous carbon material is marked as PC 7-14-6 .

Embodiment 3

[0031] Example 3: Porous Carbon PC 9-12-6 The specific preparation process is as follows:

[0032] (1) Pretreatment of coal tar pitch: It was implemented by the same method as the step (1) in Example 1.

[0033] (2) Carry out the same method as step (2) in Example 1, except that the weighed coal tar pitch is 9 g, the magnesium oxide is 12 g, and the potassium hydroxide is 6 g.

[0034] (3) The same method as step (3) in Example 1 was carried out.

[0035] (4) Carry out the same method as step (4) in Example 1, except that the amount of 2M dilute sulfuric acid added is 270 mL, and the obtained porous carbon material is marked as PC 9-12-6 .

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Abstract

The invention discloses a method for preparing a porous carbon material by using a magnesium oxide template in cooperation with the activation of potassium hydroxide, and belongs to the technical field of carbon materials and microwave chemistry. The method comprises the following steps of: grinding coal tar pitch serving as a carbon source, nano magnesium oxide serving as a template and the potassium hydroxide serving as an activating agent; transferring the mixture to a corundum crucible; and putting into a microwave reactor, performing one-step microwave heating activation, and thus obtaining the porous carbon material for an electrochemical capacitor, wherein the specific surface area of the obtained porous carbon material is between 439 and 1,394m<2> / g, the total pore volume is between 0.23 and 0.94cm<3>, the average pore size is between 1.95 and 3.36mm, the ratio of the volume of a non-micro pore to the total pore volume is between 26.1 and 86.2 percent, and the porous carbon yield is between 37.8 and 84.9 percent. The invention has the advantages that: the method is quick and energy-saving; and the prepared porous carbon is used as an electrode material of the electrochemical capacitor and has extremely high stability and high comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of carbon materials and microwave chemistry, and in particular relates to a method for preparing porous carbon materials by activating magnesium oxide templates in conjunction with potassium hydroxide. Background technique [0002] Porous carbon has a well-developed pore structure and special surface chemical properties, and has a wide range of applications in the fields of metallurgy, chemical industry, energy and environmental protection. Porous carbon has a long history of production and application, and is the earliest electrode material used in supercapacitors. The raw materials for producing porous carbon mainly include coal, petroleum and biomass. Coal tar pitch is a by-product of coal tar processing. The output of coal tar pitch in my country is very large, and most of the existing coal pitch is medium temperature pitch. Medium-temperature asphalt contains unsaturated aromatic hydrocarbons, which a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/02
Inventor 何孝军李如春郑明东谢康
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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