Method for preparing nanometer carbon fiber/foam coal through taking coal liquefaction residues as raw materials

A technology for direct liquefaction of carbon nanofibers and coal, which is applied in the field of carbon material science, a branch of inorganic non-metallic materials science and technology, can solve problems such as inability to effectively load metal catalysts, inability to cover nanocarbon fibers, and cumbersome and complicated preparation processes, and achieve easy operation , equipment requirements are not high, the effect of wide application prospects

Inactive Publication Date: 2010-04-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process not only makes the whole preparation process cumbersome and complicated, but also the use of concentrated acid will inevitably cause harm to the environment.
In addition, due to the impregnation process of foamed carbon in concentrated acid and subsequent metal salt solution, a small amount of bubbles may be formed on the surface of the carbon substrate. The area covered by these bubbles cannot effectively support the metal catalyst, and eventually the surface of the foamed carbon may have some Areas that cannot be covered with carbon nanofibers
Cause uneven product quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 10g of coal liquefaction residue ground to 120 mesh and 8g of n-pentane into a porcelain crucible, then place it in an autoclave, repeatedly inject high-purity nitrogen 2 to 3 times to remove the air, and then fill the autoclave with nitrogen to 3MPa. Raise the temperature to 210°C and keep the temperature for 4 hours. The autoclave was burst released and water cooled. Open the autoclave and take out the foamed carbon preform. The carbon foam preform was placed in a tube furnace, and in an air atmosphere, the temperature was raised to 350 °C at a rate of 1 °C / min, and then cooled to room temperature after a constant temperature of 1 h to obtain an oxidized carbon foam preform. The oxidized foamed carbon preform prepared above was heated up to 700°C at 2°C / min under high-purity nitrogen for carbonization, and then cooled down to room temperature naturally after constant temperature for 1 hour to obtain a metal / foamed carbon composite material.

[0027] Put the m...

Embodiment 2

[0029] Weigh 3 g of coal liquefaction residue ground to 80 mesh and 2 g of n-pentane into a porcelain crucible, then place it in an autoclave, and repeatedly inject high-purity nitrogen 2 to 3 times to exhaust the air, and then fill the autoclave with nitrogen to 3MPa. Raise the temperature to 220°C and keep the temperature for 4 hours. The pressure of the autoclave was suddenly released, and at the same time, it was placed in cold water to cool down to room temperature. Open the autoclave and take out the foamed carbon preform. The carbon foam preform was placed in a tube furnace, and in an air atmosphere, the temperature was raised to 300 °C at a rate of 2 °C / min, and then cooled to room temperature after a constant temperature of 1 h to obtain an oxidized carbon foam preform. The oxidized foamed carbon preform prepared above was heated up to 700°C at 2°C / min under high-purity nitrogen for carbonization, and then cooled down to room temperature naturally after constant tem...

Embodiment 3

[0032] Weigh 3g of coal liquefaction residue ground to 60 mesh and 2g of n-pentane into a porcelain crucible, then place it in an autoclave, and repeatedly inject high-purity nitrogen 2 to 3 times to exhaust the air, and then fill the autoclave with nitrogen to 3MPa. Raise the temperature to 230°C and keep the temperature for 4 hours. The pressure of the autoclave was suddenly released, and at the same time, it was placed in cold water to cool down to room temperature. Open the autoclave and take out the foamed carbon preform. The carbon foam preform was placed in a tube furnace, and in an air atmosphere, the temperature was raised to 340 °C at a rate of 1 °C / min, and then cooled to room temperature after a constant temperature of 1 hour to obtain an oxidized carbon foam preform. The oxidized foamed carbon preform prepared above was heated up to 700°C at 2°C / min under high-purity nitrogen for carbonization, and then cooled down to room temperature naturally after constant te...

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Abstract

The method for preparing nanometer carbon fiber / foam coal through taking coal liquefaction residues as raw materials belongs to the scientific and technological field of coal materials of the scientific and technological branch of inorganic non-metallic materials. The method takes the coal liquefaction residues as the coal source of the foam coal, and compounds metallic / foam coal compound materials through the supercritical foaming method or the formwork method, and prepares the nanometer carbon fiber / foam coal compound materials through the chemical vapor deposition of organic matter. The method fully utilizes the characteristics of metallic accelerating agent containing abundant coal organic matter, iron-contained compound and the like in the coal liquefaction residues, and prepares metallic / foam coal compound materials, and the nanometer carbon fiber completely covers on the surface of the foam coal after the chemical vapor deposition. The novel nanometer carbon fiber / foam compound materials have the structural characteristics of solid foam and hollow nanometer carbon fiber. And the method is expected to be used in the fields of catalyzer and a catalyzer carrier, a fuel battery electrode material, high-effective sorbent of a fixed bed reactor and the like.

Description

technical field [0001] The invention belongs to the field of science and technology of carbon materials, a branch of science and technology of inorganic non-metallic materials. The invention relates to a method for preparing foamed carbon by using the residue of direct liquefaction of coal as a raw material, adopting a supercritical foaming method, and then preparing a nano-carbon fiber / foamed carbon composite material through a chemical vapor deposition method. Background technique [0002] Today, when the world is facing a serious oil crisis, the price of oil is rising rapidly. The characteristic of China's energy resources is that coal resources are abundant, while oil and natural gas are relatively poor, which determines that my country's energy structure must be dominated by coal, and this energy structure will not undergo fundamental changes for a long time in the future. Variety. In order to protect the country's energy and economic security, using coal as a substitu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 邱介山肖南周颖肖正浩
Owner DALIAN UNIV OF TECH
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