Electrode spray device, carbon nanotube reactor and carbon nanotube preparation method

Abstract

The invention provides an electrode spraying device, a carbon nanotube reactor and a method for preparing carbon nanotubes. The liquid carbon source with catalysts and additives is formed into small-scale droplets by using a high-voltage electrostatic field. The charged droplets are accelerated by the electrostatic field and move to the high-temperature reaction zone at a high speed. During the movement, the carbon source in the droplets volatilizes at high temperature. The catalyst and the promoter in the droplet are subjected to the charge repulsion to produce a "Coulomb explosion", forming a high concentration, dispersive, and difficult to agglomerate catalyst particle smoke. The catalyst adsorbs the carbon atoms cracked in the carbon source at high temperature and begins to grow. The device and method provided by the invention greatly improves the conversion rate of carbon source, improves the yield of carbon nanotubes, has simple operation and low energy consumption, and can be produced on a large scale.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to an electrode spray device, a carbon nanotube reactor and a carbon nanotube preparation method. Background technique [0002] Carbon nanotubes have the characteristics of large aspect ratio, high tensile strength, good electrical conductivity, good flexibility and excellent chemical stability, and have broad applications in lithium-ion batteries, aviation, aerospace and other fields. The preparation of large-scale industrial-grade carbon nanotubes is a prerequisite for the application of carbon nanotubes. [0003] The synthesis methods of carbon nanotubes mainly include arc method, laser evaporation method, supported catalyst method and floating catalytic cracking method. Among them, the floating catalyst chemical vapor deposition method is one of the most effective methods to prepare high-quality and high-purity single-walled carbon nanotubes. The floating catalysis metho...

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Problems solved by technology

[0006] In the above floating catalytic cracking method, in order to ensure that the catalyst forms smaller particles in the high temperature pyrolysis, the concentration of the catalyst in the carbon source is low, and the ratio of the catalyst to the carbon source is usually 1:50 to 1:200, and it is required The carrier gas brings the liquid carbon source into the high-temperature zone at a high flow rate. During the evaporation process of the catalyst, additives and liquid carbon source in the high-temperature zone, due to the difference in boiling point, the three evaporate in sequence, and the gas phase is mixed unevenly, resulting in single-wall During the synthesis process of carbon nanotubes, the active components in the catalyst are relatively low overall, and the low concentration of catalyst and a large amount of carrier gas lead to low conversion rate of carbon source, so the synthesis yield of single-walled carbon nanotubes is low and the operating space is small. High energy consumption, difficult mass production, expensive

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