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Porous carbon material and method for preparing porous carbon material using microwave hot zone effect

A porous carbon material and carbon material technology, applied in the field of porous materials, can solve the problems of excessive hydroxide recovery, strong corrosion, high raw material cost, etc., to promote rapid contact reaction, reduce consumption, and reduce the cost and difficulty of recycling Effect

Active Publication Date: 2021-09-21
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are also some obvious shortcomings in the hydroxide alkali activation process, which limit its wide application: (1) the amount of general hydroxide is 3-5 times that of carbon materials, and the cost of raw materials is higher than that of other systems due to the large amount of hydroxide solids used. hole method, another problem is the recovery and treatment of excess hydroxide; (2) the activation process is generally carried out at a temperature higher than 700 ° C, and the hydroxide in this process is in a molten state and is highly corrosive. The process will produce volatile salts and flammable alkali metal vapors, which place high demands on equipment and operating processes

Method used

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  • Porous carbon material and method for preparing porous carbon material using microwave hot zone effect
  • Porous carbon material and method for preparing porous carbon material using microwave hot zone effect
  • Porous carbon material and method for preparing porous carbon material using microwave hot zone effect

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Experimental program
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Effect test

Embodiment 1

[0051] The pre-carbonized coconut shell carbon, petroleum coke, coal, multi-walled carbon nanotubes and nano-carbon black were treated with 25% hydrogen peroxide, and then impregnated with 50% NaOH aqueous solution to obtain a solid sample with a NaOH loading of 20%. Take 100 grams of sample and process it in a microwave reactor with microwave irradiation with a frequency of 1.2 GHz for 8 minutes, and the nitrogen flow rate during the process is 200 mL / min. The cooled sample was mixed and eluted three times with 1.0 kg of deionized water, and the treatment time was 30 minutes in ultrasonic cleaning each time, and the solid sample was filtered and dried. The porosity properties of the samples were determined by nitrogen adsorption and desorption isotherms. The specific experimental results are shown in Table 1.

[0052] Table 1 Porosity characteristic test result of sample

[0053]

Embodiment 2

[0055] The pre-carbonized coconut shell carbon, petroleum coke, coal, multi-walled carbon nanotubes and nano-carbon black were treated with 25% hydrogen peroxide and impregnated with 50% KOH aqueous solution to obtain a solid sample with a KOH loading of 20%. Take 100 grams of sample and process it in a microwave reactor with microwave irradiation with a frequency of 1.2 GHz for 8 minutes, and the nitrogen flow rate during the process is 200 mL / min. The cooled sample was mixed and eluted three times with 1.0 kg of deionized water, and the treatment time was 30 minutes in ultrasonic cleaning each time, and the solid sample was filtered and dried. The porosity properties of the samples were determined by nitrogen adsorption and desorption isotherms. The specific experimental results are shown in Table 2.

[0056] Table 2 Porosity characteristic test result of sample

[0057]

Embodiment 3

[0059] Pre-carbonized coconut shell carbon, petroleum coke, coal, multi-walled carbon nanotubes and nano-carbon black are treated with 25% hydrogen peroxide, and then impregnated with 50% NaOH / KOH (mass ratio 1:1) aqueous solution to obtain NaOH / KOH A solid sample with a loading of 20%. Take 100 grams of sample and process it in a microwave reactor with microwave irradiation with a frequency of 1.2 GHz for 8 minutes, and the nitrogen flow rate during the process is 200 mL / min. The cooled sample was mixed and eluted three times with 1.0 kg of deionized water, and the treatment time was 30 minutes in ultrasonic cleaning each time, and the solid sample was filtered and dried. The porosity properties of the samples were determined by nitrogen adsorption and desorption isotherms. The specific experimental results are shown in Table 3.

[0060] The porosity characteristic measurement result of table 3 sample

[0061]

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Abstract

The invention relates to a porous carbon material and a method for preparing the porous carbon material by utilizing the microwave hot zone effect, which belongs to the technical field of porous materials and solves the problem of large amount of alkali metal hydroxide, high cost of raw materials and excessive alkali metal hydroxide in the prior art. It is difficult to recycle waste, high processing cost, strong corrosion, and strict requirements on equipment and operation process. The method for preparing a porous carbon material by using the microwave hot zone effect comprises the following steps: the carbon material is immersed in an alkali metal hydroxide solution to obtain a solid sample loaded with alkali metal hydroxide; the solid sample is irradiated with microwaves in an inert gas to obtain a porous carbon material. A solid mixture of a pore-activated carbon material and an alkali metal salt; the alkali metal salt is removed by washing to obtain a pore-forming activated carbon material. The invention uses less amount of alkali metal hydroxide and reduces the difficulty and cost of recovery and treatment.

Description

technical field [0001] The invention relates to the technical field of porous materials, in particular to a porous carbon material and a method for preparing the porous carbon material by utilizing the microwave hot zone effect. Background technique [0002] There are usually physical and chemical methods for the activation of carbon materials. The physical method is a gas activation method. The activated gas (water vapor, carbon dioxide, air or flue gas, etc.) is in contact with the carbonized raw material at a high temperature of 800-1000 ° C, and the raw carbon is activated through the high-temperature oxidation process of the activated gas. hole. The chemical method usually uses chemicals to impregnate the carbonized precursor and then heat-treat the pore-forming process. Acidic chemical reagents such as zinc chloride, phosphoric acid, and polyphosphoric acid are mainly used to treat wood chips and biomass raw materials; sodium hydroxide or potassium hydroxide is mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/348C01B32/39
CPCC01B32/348C01B32/39
Inventor 李峰波袁国卿
Owner INST OF CHEM CHINESE ACAD OF SCI
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