School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210023, PR China; State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, PR China.
School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210023, PR China.
Waste Manag. 2024 Dec 15;190:161-168. doi: 10.1016/j.wasman.2024.09.016. Epub 2024 Sep 24.
Catalytic reforming offers a promising method for converting waste plastics into valuable products such as carbon nanotubes (CNTs). The composition of the carbon source plays a crucial role in determining the growth of CNTs because pyrolysis temperature exerts a significant influence on volatilisation. This study investigated the impact of pyrolysis temperature on the formation of CNTs in the presence of an Fe/AlO catalyst. A pyrolysis temperature of 500 ℃, generated a liquid product containing a high concentration of long-chain waxy hydrocarbons, while the gaseous products were dominated by CH (47 vol%) and CH (20 vol%). Increasing the pyrolysis temperature facilitated the formation of CH and aromatic hydrocarbons at the expense of the waxy components. Following catalysis, carbon deposits of > 30 wt% (comprising approximately 80 % CNTs) were obtained at 500 ℃, compared to 20 wt% (with CNTs comprising 60 %) at 900 ℃. In summary, the results suggest that small molecular hydrocarbons, including CH and waxy components, promote CNT formation, whereas aromatic hydrocarbons contribute to the formation of amorphous carbon or coke.
催化重整为将废塑料转化为有价值的产品（如碳纳米管（CNTs））提供了一种有前途的方法。碳源的组成在确定 CNTs 的生长方面起着至关重要的作用，因为热解温度对挥发有显著影响。本研究在 Fe/AlO 催化剂存在的情况下，考察了热解温度对 CNTs 形成的影响。在 500℃的热解温度下，产生了一种含有高浓度长链蜡质烃的液体产物，而气态产物主要由 CH（47 vol%）和 CH（20 vol%）组成。提高热解温度有利于 CH 和芳烃的形成，而蜡质成分则减少。催化后，在 500℃下获得了>30 wt%（约 80%为 CNTs）的碳沉积物，而在 900℃下仅为 20 wt%（其中 CNTs 占 60%）。总之，结果表明，包括 CH 和蜡质成分在内的小分子烃促进了 CNT 的形成，而芳烃则有助于形成无定形碳或焦。
