Method for preparing super active carbon based on hickory with coal being adulterated

A pecan shell and pecan technology is applied in the preparation field of coal-doped pecan shell-based super activated carbon, which can solve the problems of potassium vapor running out, potential safety hazards, and high KOH cost, and achieve the advantages of avoiding potassium vapor emission and cost saving. Effect

Inactive Publication Date: 2007-12-26
周华江
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing coal-doped hickory shell-based super activated carbon, which mainly solves the problem in the prior art that it is difficult to achieve a high volume-specific capacity of super activated carbon using only one raw material as a carbon precursor The present invention also solves the problem of mixing coconut shells or walnut shells with solid potassium hydroxide for activation in a microwave oven. The microwave method is difficult to achieve industrialization, and the cost of KOH is high. Potassium vapor will come out after activation at 800 ° C, which is relatively safe. Technical problems such as hidden dangers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: the preparation method of a kind of coal-doped pecan shell-based super activated carbon of this example, its steps are:

[0025] a. Under inert gas protection conditions, the coarse particle coal is heated to 430°C at a heating rate of 5°C / min and stayed for 5h, and then heated to 600°C for carbonization for 2 hours; the carbonized coal and the carbonized hickory shell are separated Grinding on a micronizer to D 50 At about 300 mesh to 500 mesh, then mix evenly with a double cone dryer according to the mass ratio of pulverized coal powder and hickory nut shell powder at 1:1;

[0026] b. Mix the mixture with sodium hydroxide (NaOH) and ethanol in a ratio of 1:3, add warm water equal to NaOH and 5% ethanol to dissolve and soak for 24 hours;

[0027] c. Raise the above-mentioned solid-liquid mixture to 320 degrees at a heating rate of 3°C / min in the rotary kiln, and stay there for 2 to 5 hours. At this stage, the speed of the rotary kiln is set at 2 rpm;

...

Embodiment 2

[0031] Embodiment 2: the preparation method of a kind of coal-doped pecan shell-based super activated carbon of this example, its steps are:

[0032] a. Under inert gas protection conditions, the coarse particle coal was heated to 350°C at a heating rate of 5°C / min and stayed for 5 hours, and then heated to 500°C for 2 hours; the carbonized coal and the carbonized hickory shell Pulverize on a micro pulverizer to D 50 At about 300 mesh to 500 mesh, then mix evenly with a double cone dryer according to the mass ratio of pulverized coal powder and hickory nut shell powder at 5:1;

[0033] b. Mix the mixture with sodium hydroxide, i.e. NaOH, in a ratio of 1:2, and add warm water equal to NaOH and 5% ethanol to dissolve and soak for 24 hours;

[0034] c. Raise the above-mentioned solid-liquid mixture to 320 degrees at a heating rate of 3°C / min in the rotary kiln, and stay there for 2 to 5 hours. At this stage, the speed of the rotary kiln is set at 2 rpm;

[0035] d. Continue to ...

Embodiment 3

[0038] Embodiment 3: the preparation method of a kind of coal-doped pecan shell-based super activated carbon of this example, its steps are:

[0039] a. Under inert gas protection conditions, the coarse particle coal was heated to 350°C at a heating rate of 5°C / min and stayed for 5 hours, and then heated to 500°C for 2 hours; the carbonized coal and the carbonized hickory shell Pulverize on a micro pulverizer to D 50 At about 300 mesh to 500 mesh, then mix evenly with a double cone dryer according to the mass ratio of pulverized coal powder and hickory nut shell powder at 3:1;

[0040] b. Mix the mixture with sodium hydroxide, i.e. NaOH, in a ratio of 1:5, add warm water equal to NaOH and 5% ethanol to dissolve and soak for 24 hours;

[0041] c. Raise the above-mentioned solid-liquid mixture to 320 degrees at a heating rate of 3°C / min in the rotary kiln, and stay there for 2 to 5 hours. At this stage, the speed of the rotary kiln is set at 2 rpm;

[0042] d. Continue to heat u...

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Abstract

This invention relates to a method for preparing coal-doped Carya cathayensis shell-based super activated carbon. The method solves the problem of low specific volumetric capacity of activated carbon prepared by using one raw material as the carbon precursor. The method also addresses the problem that coconut shell or walnut shell and solid KOH are difficult to be activated in microwave oven. Besides, KOH has a high cost, and activation at 800 deg.C may generate K vapor. The method comprises: pulverizing carbonized coal and Carya cathayensis shell in fine pulverizers, mixing uniformly according to a certain ratio, mixing the mixture with NaOH and ethanol uniformly, heating the mixture in an activation furnace, activating, cooling, washing with HCl, rinsing with tap water, filtering and drying to obtain coal-doped Carya cathayensis shell-based super activated carbon.

Description

technical field [0001] The invention relates to an activated carbon, in particular to a method for preparing coal-doped hickory shell-based super activated carbon. Background technique [0002] At present, research on supercapacitors mainly focuses on carbon electrode materials, electrolytes, and structural design. Among them, carbon electrode materials are considered to be the key to improving capacitance performance, which determines the energy density, power density, and cycle performance of supercapacitors. Currently, carbon materials used as supercapacitor electrodes include super activated carbon, activated carbon fiber cloth, carbon aerogel, carbon nanotubes, etc. Supercapacitors using carbon aerogels and carbon nanotubes as electrodes have excellent capacitive performance, but due to the complicated preparation process and high cost, it is difficult to carry out large-scale production. Activated carbon fiber cloth needs to go through many steps such as spinning, wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 高凤仙
Owner 周华江
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