Process for preparing carbon nano tube and carbon onion by Ni/Al catalyst chemical gas phase deposition

Abstract

The present invention discloses Ni / Al catalytic chemical vapor deposition (DVD) process of preparing carbon nanotube and carbon onion. The preparation process can obtain carbon nanotube and carbon onion of high quality and high purity in high yield. Firstly, nickel nitrate hexahydrate and aluminum powder in certain weight ratio are prepared Ni / Al catalyst precursor in corresponding weight ratio in the presence of sodium hydroxide or ammonia water as precipitant. Hydrogen is introduced to reduce the Ni / Al catalyst precursor into Ni / Al catalyst, and methane, acetylene or other gas as carbon source is then introduced to perform catalytic cracking reaction of 1-4 hr.

Description

technical field [0001] The invention relates to a preparation technology of carbon nanotubes and carbon onions. Background technique [0002] Carbon nanotubes have been recognized internationally as a new type of functional material and structural material with excellent performance, which can be used as high-density hydrogen storage materials, high-strength composite materials, high-definition flat panel displays, nano-device and new electromagnetic wave-absorbing materials Wait. At present, there are mainly three methods for preparing carbon nanotubes: catalytic cracking method, arc method and laser evaporation method. The preparation of carbon nanotubes by catalytic cracking usually requires the use of transition metals (Fe, Co, Ni) or their compounds as catalysts. Although Ni / Al 2 o 3 The development of carbon nanotubes as a catalyst is relatively mature, with high yield and high purity, but the obtained carbon tubes are not suitable for composite materials due to co...

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Problems solved by technology

At present, carbon onion is prepared by CVD method, and the literature reports only use Ni as a catalyst. In the final carbon product, there is very little carbon onion, so complicated separation and purification are essential steps.

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