Composite catalyst for growing carbon nanotubes and preparation method thereof

Abstract

The invention belongs to the field of carbon nano material preparation processes and application technologies, and particularly relates to a composite catalyst for growing carbon nanotubes and a preparation method thereof. The composite catalyst is composed of a transition metal main catalyst and an oxide support cocatalyst, by adjusting the stoichiometric ratio, the main catalyst is evenly distributed in the cocatalyst and the particle size is controllable, synthetic carbon nanotubes can be efficiently catalyzed, and the diameters and shapes of the carbon nanotubes can be adjusted; and the composite catalyst can be prepared through a chemical complexation method and calcined for two steps in the air. According to the composite catalyst for growing the carbon nanotubes and the preparationmethod thereof, the process is simple and easy to conduct, energy consumption is low and the cost is low, large quantities of the carbon nanotubes can be synthesized to achieve industrial production,and great application values for the subsequent industrial growth of the carbon nanotubes with different diameters and shapes are brought.

Description

technical field [0001] The invention relates to the technical field of carbon nanomaterial preparation technology and application. More specifically, it relates to a composite catalyst for growing carbon nanotubes and a preparation method thereof. Background technique [0002] Carbon nanotubes were discovered by Japanese scholar Sumio Iijima in 1991. They belong to one-dimensional carbon nanomaterials, that is, small tubes with nanoscale diameters. Carbon nanotubes have high thermal conductivity, chemical stability and thermal stability, and carbon nanotubes formed by coiling with different helical angles have semiconducting and metallic properties respectively; on the other hand, this tubular structure is comparable to steel with the same diameter , has a tensile strength of more than 100 times and can be bent to 90° without damage; at the same time, carbon nanotubes are hollow, and the atomic weight of carbon is small, which makes carbon nanotubes have a low density. They...

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Problems solved by technology

Supported Catalyst for Synthesis of Carbon Nanotubes, Preparation Method thereof, and Carbon Nanotubes Using the Same, and No. 2012 / 0093458 Highly conductive carbon nanotubes with a vertically oriented beam structure and a high-conductivity polymer nanocomposite material composition using the same, and are respectively disclosed for broken spherical catalysts and flake-shaped catalysts, but these patents The invented catalyst can only be used to grow the above-mentioned type of carbon nanotubes, that is, due to the fixed ratio of the catalyst, it cannot be widely used to grow various types of carbon nanotubes, and in carbon nanotubes In the actual commercial application of tubes, different types of carbon nanotubes need to be used for different application directions to maximize benefits, so the products grown by these catalysts have serious shortcomings in utilizing the excellent characteristics of different types of carbon nanotubes

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