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Directly-prepared ultrahigh-purity carbon nanotube and preparation method thereof

A carbon nanotube and ultra-high-purity technology, which is applied in the field of directly prepared ultra-high-purity carbon nanotubes and its preparation, can solve the problems of malignant motor vehicle accidents, increased cost, and difficulty in dispersion, and achieves good effects and reduces energy consumption. , the effect of low cost of raw materials

Active Publication Date: 2013-07-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because metal impurities induce free radical reactions in rubber, tires age (strength deteriorates), which may induce vicious accidents of motor vehicles driving at high temperatures and at high speeds
However, metal impurities in lithium-ion batteries will cause lithium ions to move out and gradually generate larger dendrites, which will damage the diaphragm and cause short circuits in the battery, etc.
Obviously, the current direct preparation technology of carbon nanotubes is far from meeting this requirement.
The method of removing metal impurities by acid treatment or high-temperature evaporation can increase the purity of carbon nanotubes to 99.9%, but the cost will increase significantly and a large amount of waste acid will be produced (environmental pollution)
Moreover, after these treatments, carbon nanotubes are easy to agglomerate and difficult to disperse, which increases the difficulty of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Use the nitrate of Fe and aluminum, ammonium molybdate, ammonium carbonate and urea to prepare an acidic solution of 0.1Mol / L and an alkaline solution of 0.105Mol / L, and the above two solutions are added dropwise in the same volume ratio, Drop into a container that contains deionized water in advance and starts stirring in advance, the volume of deionized water in the container is 30% of the total volume of acidic solution and alkaline solution, and the temperature of the solution is always controlled at 60 ° C, 5 After hours of acid-base precipitation to obtain a catalyst-containing liquid, add SiO after calcination at 700°C for 3 hours 2 Inert carrier (particle size is 600 microns, sphericity is 80, bulk density is 800kg / m 3 ), so that the viscosity of the slurry is 17Pa·s. After the above-mentioned slurry was dried at room temperature and baked at 400°C for 4 hours, the Fe / Mo / Al containing 20wt% Fe and 35wt% Mo was obtained. 2 o 3 The catalyst has a catalyst cryst...

Embodiment 2

[0032] Use the nitrate of Co and aluminum, ammonium molybdate and ammonium carbonate, urea and ammonia water to prepare an acidic solution of 1Mol / L and an alkaline solution of 1.05Mol / L, and add the above two solutions dropwise in the same volume ratio , drop into a container that contains deionized water in advance and starts stirring in advance. The volume of deionized water in the container is 30% of the total volume of the acidic solution and the alkaline solution. The temperature of the solution is always controlled at 90 ° C, 5 After hours of acid-base precipitation to obtain a catalyst-containing liquid. Add ZrO after calcination at 900°C for 3 hours 2 Inert carrier (particle size is 500 microns, sphericity is 76, bulk density is 1500kg / m 3 ), so that the viscosity of the slurry is 30Pa·s. After the above slurry was dried at room temperature and baked at 600°C for 3 hours, a Co / Mo / Al containing 30wt% Co and 40wt% Mo was obtained. 2 o 3 The catalyst has a catalyst g...

Embodiment 3

[0034] Use the hydrochloride of Ni, the nitrate of manganese and aluminum, urea and ammonia water, be made into the acidic solution of 0.5Mol / L and the basic solution of 0.525Mol / L, the above-mentioned two kinds of solutions are adopted dropwise in the same volume ratio method, drop into a container filled with deionized water in advance, and start stirring in advance, the volume of deionized water in the container is 30% of the total volume of acidic solution and alkaline solution, and the temperature of the solution is always controlled at 80 ° C, After 5 hours of acid-base precipitation to obtain a catalyst-containing liquid. Add ZrO after calcination at 800°C for 4 hours 2 Inert carrier (particle size is 200 microns, sphericity is 90, bulk density is 1200kg / m 3 ), so that the viscosity of the slurry is 20Pa·s. After drying the above slurry at room temperature and roasting at 900°C for 4 hours, a Ni / Mn / Al containing 25wt% Ni and 10wt% Mn was obtained. 2 o 3 The catalyst...

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Abstract

The invention discloses a directly-prepared ultrahigh-purity carbon nanotube and a preparation method thereof, belonging to the technical field of carbon nanotubes. Under the condition that purification is not required, the purity of the carbon nanotube is greater than 99.7 weight percent, the tube diameter is between 0.8 nanometer and 30 nanometers, the specific surface area is between 200 m<2> / g and 500 m<2> / g, the agglomeration density is between 30 kg / m<3> and 150 kg / m<3> and the agglomeration particle size is between 20 microns and 150 microns. A method for directly preparing the ultrahigh-purity carbon nanotube by adopting a chemical vapor deposition method comprises the following steps of: dispersing catalyst crystal grains generated with a liquid phase method onto the surface of an inert carrier, drying and baking; cracking hydrocarbon with 1-6 carbon atoms in a fluidized bed reactor to generate a carbon nanotube; and separating the inert carrier from the generated carbon nanotube at a higher air speed. The carbon nanotube obtained with the method has the purity between 99.7 percent and 99.9 percent, and has the advantages of high carbon nanotube quality, no need of removing impurities by acid treatment, low cost and easiness for amplification and preparation.

Description

technical field [0001] The invention belongs to the technical field of carbon nanotube preparation, in particular to a directly prepared ultrahigh-purity carbon nanotube and a preparation method thereof. Background technique [0002] Carbon nanotubes are a seamless tubular material formed by sp2 hybridized carbon coils. Due to the closed structure of the tube wall, no dangling bonds, and its huge aspect ratio, the electrical conductivity, thermal conductivity, and mechanical strength of carbon nanotubes, etc. Both are the highest values ​​of currently known materials, and the study of its preparation and application has important academic significance and application prospects. [0003] After nearly 20 years of development, chemical vapor deposition has become the most important method for preparing carbon nanotubes. The principle is: use nano-metal catalysts (mainly iron, cobalt, nickel, etc. loaded on porous carriers or Si substrates) to crack carbon sources (such as hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/00C01B31/02
Inventor 骞伟中崔超婕张颖华魏飞
Owner TSINGHUA UNIV
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