ZHANG Tiankai;WANG Qi;ZHANG Yongfa;

• 1:Key Laboratory of Coal Science and Technology
• 2:Ministry of Education and Shanxi Province
• 3:Taiyuan University of Technology

Abstract：

Coal resources is rich in China,but at present,the traditional utilization methods,mainly including combustion,pyrolysis and gasification,have some problems such as waste of resources,environmental pollution and low economic benefits,and the energy structure with coal as the theme will not change in a short period of time. Therefore,clean and efficient utilization is the foothold and primary task of coal resources in the new era. On the other hand,carbon nanotubes have excellent properties in mechanics,electricity and thermotics due to their unique one-dimensional structure,which makes them widely used in the fields of composite materials,electronic materials and energy materials. However,the problem of high preparation cost of carbon nanotubes is prominent,which severely limits its large-scale application. At present,it is urgent to develop new and environmentally friendly carbon nanotubes preparation technology. The above two problems can be well solved by the large-scale and low-cost coal-based carbon nanotubes preparation technology at the same time. Based on the literature,in this paper,the influence of reaction materials,discharge atmosphere and catalyst on the direct preparation of carbon nanotubes by arc discharge method and plasma jet method was analysed,and the influence process of raw materials,catalyst,reaction temperature,heating rate and reaction atmosphere on the preparation of indirect carbon nanotubes by chemical vapor deposition method was discussed. It is found that in arc discharge and plasma jet methods,the type of raw materials plays an important role in the production of carbon nanotubes,the discharge atmosphere has an significant influence on the type of carbon nanotubes,and the catalyst has great effects on both the production and type of carbon nanotubes. In the chemical vapor deposition method,the type of raw materials has a major impact on the morphology,aspect ratio and order degree of carbon nanotubes,the catalyst can make a big difference to the growth process of carbon nanotubes,the reaction temperature and heating rate will influence on the diameter change and type of carbon nanotubes,and the reaction atmosphere can change the catalytic effect of the catalyst. In addition,in this paper,the types and characteristics of the growth mechanism of carbon nanotubes in the direct and indirect preparation of coal-based carbon nanotubes were summarized: the growth process of carbon nanotubes in the direct preparation technology conformed to the fragment growth mechanism,while the growth process of carbon nanotubes in the indirect preparation technology could be divided into four types: gas-liquid-solid( VLS),gas-solid-solid( VSS),gas-phase nucleation( VPN) and ladder type. Analysis shows that the further research should be carried out on the following aspects: the process of preparing carbon nanotubes from cheap raw materials such as coal,coal pyrolysis gas and commercial gas is investigated,so as to establish and improve the relationship system between raw materials and carbon nanotubes products,and the new and efficient preparation technology of coal-based carbon nanotubes catalyst is developed. The growth models of new carbon nanotubes are established,so as to further enrich and improve the carbon nanotubes growth model system further.

Key Words： carbon nanotubes;preparation technology;growth mechanism;low rank coal

Abstract:

Keywords:

Foundation: 国家自然科学基金资助项目(51774211)

Authors: ZHANG Tiankai;WANG Qi;ZHANG Yongfa;

DOI: 10.13226/j.issn.1006-6772.19103103

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