State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology
Engineering College of Huazhong Agricultural University

催化热解技术可将废塑料转化为高品质的碳纳米管（CNTs），实现废塑料的回收和高价值利用。然而，塑料催化热解过程复杂，影响因素繁多，且碳纳米管的生长机制不清，因此，本综述从塑料种类、温度、催化剂等角度阐述了塑料结构以及热解过程对碳纳米管生长过程以及结构特性的影响，并解析了碳纳米管的成核和成长过程机理。发现挥发分种类和温度会对CNTs结构产生影响，而催化剂的性能将影响碳纳米管的直径和生长方式；催化剂与CNTs之间的作用力大小取决于催化剂的种类，CNTs边界的碳扩散强度又受反应条件、催化剂和碳源种类的影响，两者之间的相对大小决定CNTs成核和生长具体过程。该综述为废塑料热解制备碳纳米管过程的理解以及废塑料资源化利用技术的开发提供理论参考。

Catalytic pyrolysis technology can convert waste plastics into high-quality carbon nanotubes (CNTs), achieving the recycling and high-value utilization of waste plastics. However, the process of plastic catalytic pyrolysis is complex, with numerous influencing factors, and the growth mechanism of carbon nanotubes is unclear. Therefore, this article elaborates on the influence of plastic structure and pyrolysis process on the growth process and structural characteristics of carbon nanotubes from the perspectives of plastic type, temperature, catalyst, etc., and analyzes the nucleation and growth mechanism of carbon nanotubes. It is found that the type and temperature of volatile matter will affect the structure of CNTs, while the performance of the catalyst will affect the diameter and growth mode of carbon nanotubes. The force between the catalyst and CNTs depends on the type of catalyst, and the carbon diffusion intensity at the boundary of CNTs is influenced by reaction conditions, catalyst and carbon source types. The relative size between the two determines the specific process of CNTs nucleation and growth.This review provides theoretical reference for the understanding of the process of preparing carbon nanotubes from waste plastic pyrolysis and the development of waste plastic resource utilization technologies.

国家自然科学基金杰出青年基金(52125601)资助

黎书江, 肖皓宇, 蒋好, 姚丁丁, 陈应泉, 王贤华, 杨海平, 陈汉平. 塑料催化热解制备碳纳米管生长特性和机制的研究进展[J]. 燃料化学学报（中英文）, 2023, 51(8): 1073-1083.

LI Shu-jiang, XIAO Hao-yu, JIANG Hao, YAO Ding-ding, CHEN Ying-quan, WANG Xian-hua, YANG Hai-ping, CHEN Han-ping. Research progress in the growth mechanism of carbon nanotubes prepared by catalytic pyrolysis of waste plastics[J]. Journal of Fuel Chemistry and Technology, 2023, 51(8): 1073-1083.