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Method for preparing carbon nanotubes by adopting coal tar

A carbon nanotube, coal tar technology, applied in nanotechnology, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of increased raw material cost, poor safety, high price, etc., and achieves simple structure and location. Smooth and improve the effect of catalytic activity

Inactive Publication Date: 2015-04-29
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned organic substances also have obvious defects. One: the use safety is poor, and the above-mentioned organic substances are all gases, and the raw materials can explode when mixed with a small amount of air during the preparation process; second: the above-mentioned organic substances are expensive, which directly leads to an increase in the cost of raw materials

Method used

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  • Method for preparing carbon nanotubes by adopting coal tar
  • Method for preparing carbon nanotubes by adopting coal tar

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the coal tar vaporizer of this embodiment includes a vaporization pipeline 1 and a variable-diameter pipeline 2 communicated with the vaporization pipeline 1, and the end of the vaporization pipeline 1 away from the variable-diameter pipeline 2 is provided with a first air inlet 1-1, The pipe wall of the vaporization pipeline 1 is provided with a feed port 1-2, the feed port 1-2 communicates with the coal tar storage tank 4 through the feed pipe 3, and the variable diameter pipe 2 is far away from the vaporization pipe 1 One end of the pipe is closed and provided with an air outlet 2-1, and the size of the end of the reducing pipe 2 away from the vaporization pipe 1 is larger than that of the other end.

[0035] Such as figure 1 As shown, in this embodiment, the vaporization pipe 1 is an internally threaded pipe, and the variable diameter pipe 2 is a variable diameter internally threaded pipe.

[0036] Such as figure 1 As shown, in this emb...

Embodiment 2

[0040] Step 1. Soak ferric oxide powder with a particle size of 45 μm in SnCl with a concentration of 1.5 mol / L 2Carry out sensitization in the solution, the time of sensitization is 50min, dry after filtering, place the ferric oxide powder after the drying in the gas phase depositor, adopt physical deposition to the ferric oxide powder surface in the described vapor phase depositor Nickel plating to obtain an iron-containing catalyst; the pressure of the physical deposition is 0.01Pa, the temperature is 1200°C, and the time is 20min;

[0041] Step 2, using the coal tar vaporizer of Embodiment 1, pass the protective gas into the vaporization pipeline 1 through the first air inlet 1-1, and the flow rate of the protective gas is 100cm 3 / s, negative pressure is generated at the feed port 1-2 while ventilating so that the coal tar in the coal tar storage tank 4 is delivered to the vaporization pipeline 1 by the feed pipe 3, or the feed pipe 3 and the feed pipe 3 are opened while ...

Embodiment 3

[0046] Step 1. Soak ferric oxide powder with a particle size of 35 μm in SnCl with a concentration of 0.5 mol / L 2 Carry out sensitization in the solution, the time of sensitization is 40min, dry after filtering, place the ferric oxide powder after the drying in the vapor phase depositor, adopt physical deposition to the surface of the ferric oxide powder in the vapor depositor Nickel plating to obtain an iron-containing catalyst; the gas pressure of the physical deposition is 0.0001Pa, the temperature is 1000°C, and the time is 10min;

[0047] Step 2, using the coal tar vaporizer of Embodiment 1, pass the protective gas into the vaporization pipeline 1 through the first air inlet 1-1, and the flow rate of the protective gas is 100cm 3 / s, negative pressure is generated at the feed port 1-2 while ventilating so that the coal tar in the coal tar storage tank 4 is delivered to the vaporization pipeline 1 by the feed pipe 3, or the feed pipe 3 and the feed pipe 3 are opened while ...

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Abstract

The invention discloses a method for preparing carbon nanotubes by adopting coal tar. The method comprises the following steps: 1, soaking ferroferric oxide powder in a SnCl2 solution to perform sensitization, and plating nickel on the surface of the ferroferric oxide powder by adopting physical deposition to obtain an iron-containing catalyst; 2, introducing a protective gas into a coal tar vaporizer to blow away and vaporize the coal tar, thereby obtaining a mixed gas of the coal tar and the protective gas after vaporization; 3, putting the iron-containing catalyst into a corundum boat, putting the corundum boat into a tubular furnace, introducing the mixed gas when the furnace temperature rises to 400-600 DEG C, applying an intermediate-frequency induction power source to the tubular furnace at the same time, stopping introducing the mixed gas and turning off the intermediate-frequency induction power source after 20-30 minutes, and cooling along with the furnace to obtain a semi-finished product; and 4, sieving the semi-finished product in water, and drying an oversize product to obtain the carbon nanotubes. According to the method disclosed by the invention, a coke coking byproduct namely the coal tar is adopted as a raw material for preparing the carbon nanotubes, and the average pipe diameter of the prepared carbon nanotubes is 28-60nm.

Description

technical field [0001] The invention belongs to the technical field of carbon nanotube preparation, and in particular relates to a method for preparing carbon nanotubes by using coal tar. Background technique [0002] A carbon nanotube is a tubular carbon molecule, each carbon atom on the tube takes sp 2 Hybridization, combined with carbon-carbon σ bonds to form a honeycomb structure composed of hexagons as the skeleton of carbon nanotubes. A pair of p-electrons on each carbon atom that does not participate in hybridization forms a conjugated π-electron cloud that spans the entire carbon nanotube. According to the number of layers of the tube, it can be divided into single-walled carbon nanotubes and multi-walled carbon nanotubes. Arranged in a unique two-dimensional planar hexagonal structure, it exhibits excellent mechanical properties and good electrical, thermal, magnetic and other properties. In terms of mechanical properties, carbon nanotubes have extremely high str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82Y30/00
Inventor 陈进
Owner XIAN UNIV OF SCI & TECH
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