Preparation technology of mesopore-rich active carbon with high specific surface area

A high specific surface area, activated carbon technology, applied in the direction of inorganic chemistry, non-metallic elements, carbon compounds, etc., can solve the problems of inseparability, difficult recycling, small pore size, etc., to facilitate recycling, reduce production costs, reduce The effect of environmental pressure

Inactive Publication Date: 2012-07-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with these two patents is that the metal catalyst remaining on the activated carbon is not easy to remove, which affects the performance and application of activated carbon;
[0005] Patent CN200610041562.6 "A method for preparing activated carbon with rich mesopores and high specific surface area" is to activate carbon-containing precursors after preparing NaOH and KOH in a certain proportion, although it is easy to obtain mesopores and high specific surface area activated carbon, but the components in the waste alkali produced after the crude product is washed after activation are complex, cannot be separated, and are not easy to recycle;
[0006] Patent ZL200410012345 "Preparation method of mesoporous carbon with high specific surface area" is the secondary activation of activated carbon with KOH. The pore size of the obtained activated carbon is relatively small, and the pore size control is difficult, which affects its application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The carbon-containing precursors mentioned above are petroleum coke, coal, phenolic resin, corn stalk carbonized material, fruit shell carbonized material, bamboo charcoal, coconut shell carbonized material, and rice husk carbonized material.

[0018] Mix petroleum coke and KOH with a weight ratio of 1:3 and raise it from room temperature to 1000°C, keep the temperature for 3 hours and then cool down to room temperature naturally, take out the activated product and wash it with a large amount of water to neutrality After mixing in a weight ratio of 1:3, raise the temperature from room temperature to 800°C, keep the temperature for 1 hour, then cool down to room temperature naturally, wash the activated product with a large amount of water until it is neutral, and dry it to obtain the product. The specific surface area of ​​the obtained activated carbon is 2602m2 / g, the mesopore diameter is concentrated in the range of 5-8nm, and the mesopore ratio is as high as 65%.

Embodiment 2

[0020] Mix Yangquan anthracite and KOH with a weight ratio of 1:6 evenly, then raise the temperature from room temperature to 800°C, keep the temperature for 1 hour and then cool down to room temperature naturally, take out the activated product and wash it with a large amount of water until it is neutral, and then mix it with NaOH according to the ratio of the activated product and NaOH. After mixing at a weight ratio of 1:1, raise the temperature from room temperature to 1000°C, keep the temperature for 1 hour, then cool down to room temperature naturally, wash the activated product with a large amount of water until it is neutral, and dry it to obtain the product. The specific surface area of ​​the obtained activated carbon is 2958m2 / g, the mesopore diameter is concentrated in the range of 4-6nm, and the mesopore ratio is as high as 58%.

Embodiment 3

[0022] Mix bamboo charcoal and KOH with a weight ratio of 1:4 and raise it from room temperature to 900°C, keep the temperature for 2 hours and then cool it down to room temperature naturally, take out the activated product and wash it with a large amount of water until it is neutral. After mixing at a ratio of 1:2, raise the temperature from room temperature to 800°C, keep the temperature for 3 hours, then cool down to room temperature naturally, wash the activated product with a large amount of water until it is neutral, and dry it to obtain the product. The specific surface area of ​​the obtained activated carbon is 2359m2 / g, the mesopore diameter is concentrated in the range of 3-6nm, and the mesopore ratio is 60%.

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Abstract

The invention relates to a preparation technology of mesopore-rich active carbon with high specific surface area. The preparation technology comprises the following steps of: uniformly mixing carbon-containing precursor with KOH or NaOH according to the weight ratio of carbon-containing precursor to KOH or NaOH of 1:(3-6), rising the room temperature to 800-1000 DEG C, maintaining constant temperature for 1-3 hours, then naturally reducing the temperature to room temperature, taking out an activated product, cleaning the activated product to be neutral with a great amount of water, mixing the activated product with the KOH or NaOH according to the weight ratio of 1:(1-3), rising the room temperature to 800-1000 DEG C, maintaining constant temperature for 1-3 hours, then naturally reducing the temperature to room temperature, cleaning the activated product to be neutral with water, drying and obtaining a product. The method has the advantages that the cleaned waste alkali can be recycled, the environmental-protection pressure is relieved, the production cost is reduced, the specific surface area is high, the aperture of mesopores is larger, the mesopores are rich, and no metal catalyst remains.

Description

technical field [0001] The invention belongs to a preparation technology for providing activated carbon, in particular to a preparation technology for activated carbon rich in mesopores and high specific surface area. Background technique [0002] The preparation technology of high specific surface area activated carbon rich in mesopores, specifically, provides a method for chemically activating carbon-containing precursors with KOH and NaOH successively, so as to prepare high specific surface area activated carbon rich in mesopores. [0003] Patent CN201110103034.X "Method for preparing activated carbon fiber with high specific surface area by using cotton linters" puts cotton linters in a fermenter, inoculates discolored porous bacteria or white rot bacteria, ferments, washes again, and dries; KOH or NaOH Put it into the reaction kettle for activation to make activated carbon; [0004] Patent CN201010177879.9 "A Microwave Composite Activation Method for Preparation of Sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08C01B32/348
Inventor 李开喜
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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