Preparation method of carbon nanotube

A carbon nanotube and carbon alkane technology is applied in the field of catalytic cracking to prepare carbon nanotubes, which can solve the problems of high preparation cost and low conversion rate.

Pending Publication Date: 2020-07-10
内蒙古骏成新能源科技有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low conversion rate and high production cost in...

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  • Preparation method of carbon nanotube
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  • Preparation method of carbon nanotube

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Experimental program
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Embodiment 1

[0027] The preparation method of carbon nanotubes in this embodiment is as follows:

[0028] 1) Preparation of iron-based catalysts by sol-gel method;

[0029] 2) Set the temperature in the reaction zone of the reactor to 770°C, and use nitrogen to replace the oxygen in the reactor during the heating process;

[0030] 3) When the oxygen content in the reactor is lower than 0.5%, and the temperature of the reaction zone reaches 770°C, add 1.00g of catalyst, and feed methane (carbon source A) and propane (carbon source B), and the flow rates of the two are V A =0.90L / min and V B =0.27L / min, in this reaction combination, per mole of carbon source gas, the Gibbs free energy of propane cracking is -49.64kJ; stop feeding carbon source gas after 60min, then feed nitrogen replacement, remove reactant.

[0031] The reactants were weighed to be 35.7g, that is, the prepared carbon nanotubes were 34.7g.

[0032] The carbon nanotubes obtained by the preparation method of this embodiment...

Embodiment 2

[0045] The preparation method of carbon nanotubes in this embodiment is as follows:

[0046]1) Set the temperature in the reaction zone of the reactor to 750°C, and use nitrogen to replace the oxygen in the reactor during the heating process;

[0047] 2) When the oxygen content in the reactor is lower than 0.5%, and the reaction zone temperature reaches 750° C., add 1.00 g of the catalyst in Example 1, feed methane (carbon source A) and butane (carbon source B), both The flow rates are V A =0.9L / min and V B =0.019L / min, in this reaction combination, per mole of carbon source gas, the Gibbs free energy of butane cracking is -6.02kJ; stop feeding carbon source gas after 60min, then feed nitrogen replacement, remove reactant.

[0048] The reactants were weighed to be 17.3g, that is, the prepared carbon nanotubes were 16.3g.

[0049] According to the method of Example 1, the carbon source conversion rate of the preparation method of this example, the ash content of the product,...

Embodiment 3

[0051] The preparation method of carbon nanotubes in this embodiment is as follows:

[0052] 1) Set the temperature in the reaction zone of the reactor to 750°C, and use nitrogen to replace the oxygen in the reactor during the heating process;

[0053] 2) When the oxygen content in the reactor is lower than 0.5%, and the reaction zone temperature reaches 760° C., add 1.00 g of the catalyst in Example 1, feed methane (carbon source A) and butane (carbon source B), both The flow rates are V A =0.9L / min and V B =0.09L / min, in this reaction combination, per mole of carbon source gas, the Gibbs free energy of butane cracking is -26.47kJ; stop feeding carbon source gas after 60min, then feed nitrogen replacement, remove reactant.

[0054] The reactants were weighed to be 25.0 g, that is, the prepared carbon nanotubes were 24.0 g.

[0055] The carbon nanotubes obtained by the preparation method of this embodiment are detected by scanning electron microscopy, such as figure 2 sho...

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Abstract

The invention discloses a preparation method of a carbon nanotube. The carbon nanotube is prepared by catalytically cracking a carbon source gas by using a catalyst, the carbon source gas comprises methane and polycarbon alkane, and the content of the polycarbon alkane in the carbon source gas is 5-63% of the total carbon source gas based on the number of carbon atoms. According to the preparationmethod, the addition of the polycarbon alkane in the carbon source gas can do work in the cracking reaction process so that methane cracking is promoted, the conversion rate of methane is increased,the growth rate of the carbon nanotubes can be increased, the production efficiency of the carbon nanotubes is improved and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of carbon nanotube preparation, in particular to a method for preparing carbon nanotubes by catalytic cracking of methane as a carbon source. Background technique [0002] Due to their low density, excellent mechanical and electrical conductivity, and good physical and chemical stability, carbon nanotubes have broad application prospects in the fields of lithium-ion battery conductive agents, polymer composite materials, and catalyst supports. Nowadays, propylene, ethylene, acetylene, liquefied petroleum gas (the main components are propane, butane, pentane), methane, etc. are often used as carbon sources for large-scale production of carbon nanotubes. Compared with hydrocarbons such as propylene, ethylene, or acetylene, Methane is cheap, so methane is often used as a raw material for cracking and growing carbon nanotubes. However, in industrial production, the conversion rate of methane to carbon nanotubes...

Claims

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Application Information

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IPC IPC(8): C01B32/162
CPCC01B32/162C01B2202/32
Inventor 周平沈跃成陈思贝
Owner 内蒙古骏成新能源科技有限公司
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