Method for preparing carbon material with rich mesopores and macropores

A technology of carbonization and carbonization, which is applied in the field of preparation of porous carbon materials, can solve the problems of high cost, environmental pollution, and difficulty in realizing industrialization, and achieve the effect of easy operation and simple method

Inactive Publication Date: 2009-11-25
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the above method can prepare carbon materials rich in mesopores, the pore diameter is usually within 5nm, and it is difficult to prepare mesopores with a pore diameter above 10nm, let alone macropores above 50nm.
Recently reported nano-SiO 2 The template method prepared 30nm mesoporous carbon materials, but SiO 2 The removal of the template agent requires the use of highly corrosive hydrofluoric acid, the process is complicated, the cost is high, and it also pollutes the environment, making it difficult to realize industrialization
[0010] There is no relatively mature method for the preparation of macroporous carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Use thermoplastic phenolic resin as a precursor, and nano-ZnO with a particle size of about 100nm as a template, grind the two separately, mix them according to a mass ratio of 40:60, and then add 15% of the mass of phenolic resin as a curing agent hexamethylene Base tetramine, ball milling to mix the three evenly. The mixture was solidified at 250°C for 2h, crushed, placed in a carbonization furnace protected by a nitrogen atmosphere, heated to 800°C, and carbonized at a constant temperature for 1h. After carbonization, soak the carbonized material in 2mol.L -1 hydrochloric acid solution, stirred for 5h to make the remaining CaO and CaCO 3 Completely dissolve, filter, and then rinse repeatedly with deionized water until neutral, dry, porous carbon material, its specific surface area is 650m 2 .g -1 , the pore diameter is dominated by macropores of 80-90nm, accounting for 80% of the total pore volume.

Embodiment 2

[0035] Take 15g of nano-calcium carbonate (average particle size 120nm) and 5g of phenolic resin, mix evenly, press into a disc with a diameter of 20mm at a pressure of 10MPa, add hexamethylenetetramine alcohol solution dropwise to infiltrate, and dry. Heat the mixture at 3°C / min to 225°C and solidify for 90min under a nitrogen atmosphere, then carbonize at 900°C for 1 hour, and cool to room temperature; add distilled water to convert calcium oxide into calcium hydroxide, wash away the calcium hydroxide with hydrochloric acid, Wash with distilled water until there is no chloride ion; dry at 120°C to obtain a macroporous carbon material with a specific surface area of ​​300m 2 / g, the pore size is mainly distributed around 100nm.

Embodiment 3

[0037] Weigh 10g of furfuryl alcohol, 8g of formaldehyde, 9g of NiO with a particle size of about 5nm, dissolve in 60mL of ethanol, ultrasonicate for 3h, add 2-3 drops of oxalic acid, slowly rise to 60°C and 80°C while stirring, and keep the temperature for 8h respectively , to polymerize furfuryl alcohol. In high purity N 2 Under the protection of , the mixture was heated to 150°C for 3 hours, and then heated to 300°C at 2°C / min. Then the temperature was raised to 850°C, and carbonized at constant temperature for 4 hours. After carbonization, soak the carbonized material in 3moL.L -1 Nitric acid solution, stirred for 6h, then washed with water until neutral, and dried the porous carbon material. Its specific surface area is 790m 2 / g, the pore size is mainly distributed in the range of 3-5nm.

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Abstract

The invention relates to a method for preparing a carbon material with rich mesopores and macropores. Inorganic nano-particles are used as pore-forming template agent to be uniformly distributed in a carbon-contained organic precursor and then the carbon-contained organic precursor carries out high-temperature carbonization, template agent washing-out and drying to obtain a porous carbon material. The carbon material prepared by the method has the specific surface area of 50-1,900 m/g and a pore diameter mainly between 2-900 nm, can be conveniently adjusted by the size control of the selected nano-particles, removes a template without using high corrosive HF and has the advantages of simple method, convenient operation, free pore diameter adjustment and control in a mesopore and macropore range, and the like. The carbon material has a wide application prospect in fields of electrochemical energy accumulation, macromolecular adsorption, catalyst carriers, composite materials, and the like.

Description

technical field [0001] The invention relates to a preparation method of a porous carbon material rich in medium and large pores, which belongs to the field of new materials and can be widely used in adsorption, catalysis, gas storage, electrochemical energy storage (primary batteries, secondary batteries, supercapacitors, Lithium-ion batteries, fuel cells), composite materials and other fields. Background technique [0002] Due to the characteristics of developed pores, high specific surface area, high pore volume, and pore size can be adjusted within a certain range, porous carbon materials have been widely used as an adsorption material in water purification, gas separation, solvent recovery, decolorization and other fields. Electrode materials for catalyst supports, lithium-ion batteries, and supercapacitors. Different application fields have different requirements for the pore size of porous carbon materials, so pore size adjustment and control is one of the technical k...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02C01B31/08
Inventor 杨裕生赵春荣徐斌王维坤余仲宝曹高萍王安邦
Owner NO 63971 TROOPS PLA
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