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<p>In order to enhance the production of aromatic hydrocarbons, this study systematically investigated synergistic effects on pyrolysis behavior, kinetics, and product component distribution of co-pyrolysis of microalgae <i>Chlorella pyrenoidosa</i> (CP) and waste plastic polyethylene (PE) with and without HZSM-5 by thermogravimetric analysis (TGA) and pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS). Reaction mechanism for the formation of aromatic hydrocarbons during the catalytic co-pyrolysis of CP and PE was elucidated. The thermal behavior indicates that the co-pyrolysis process of CP and PE can be distinctly divided into two stages, which mainly correspond to the pyrolysis of CP and PE, respectively. In comparison with co-pyrolysis of CP and PE, the catalytic co-pyrolysis can slightly reduce the first-stage CP pyrolysis, while significantly lowering the second-stage PE pyrolysis, which expands the overlap of the pyrolysis temperature ranges between CP and PE, thereby favoring the occurrence of synergistic effects, promoting devolatilization. The kinetic analysis results show that the activation energy values of the two thermal decomposition stages in catalytic co-pyrolysis are, respectively, lower than those of the corresponding stages in co-pyrolysis. Py-GC/MS results reveal that during the catalytic co-pyrolysis of CP and PE, the experimental values of oxygeneous and nitrogenated compounds are lower than the calculated values, while the experimental values of aromatic hydrocarbons are higher than the calculated values, which exhibit a significant synergistic effect between CP and PE, substantially promoting the production of aromatic hydrocarbons through the hydrocarbon pool mechanism and the Diels–Alder reaction, with the latter proposed to play a vital role in aromatic hydrocarbon formation.</p>

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Synergistic effects of catalytic co-pyrolysis of microalgae and waste plastic for enhanced aromatic hydrocarbons using TGA and Py-GC/MS

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Xinyun Wang,
  • Chuan Li,
  • Yefeng Liu,
  • Jinpei Hei,
  • Yishuang Wang,
  • Zhonglian Yang,
  • Jun Wang,
  • Mingqiang Chen

摘要

In order to enhance the production of aromatic hydrocarbons, this study systematically investigated synergistic effects on pyrolysis behavior, kinetics, and product component distribution of co-pyrolysis of microalgae Chlorella pyrenoidosa (CP) and waste plastic polyethylene (PE) with and without HZSM-5 by thermogravimetric analysis (TGA) and pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS). Reaction mechanism for the formation of aromatic hydrocarbons during the catalytic co-pyrolysis of CP and PE was elucidated. The thermal behavior indicates that the co-pyrolysis process of CP and PE can be distinctly divided into two stages, which mainly correspond to the pyrolysis of CP and PE, respectively. In comparison with co-pyrolysis of CP and PE, the catalytic co-pyrolysis can slightly reduce the first-stage CP pyrolysis, while significantly lowering the second-stage PE pyrolysis, which expands the overlap of the pyrolysis temperature ranges between CP and PE, thereby favoring the occurrence of synergistic effects, promoting devolatilization. The kinetic analysis results show that the activation energy values of the two thermal decomposition stages in catalytic co-pyrolysis are, respectively, lower than those of the corresponding stages in co-pyrolysis. Py-GC/MS results reveal that during the catalytic co-pyrolysis of CP and PE, the experimental values of oxygeneous and nitrogenated compounds are lower than the calculated values, while the experimental values of aromatic hydrocarbons are higher than the calculated values, which exhibit a significant synergistic effect between CP and PE, substantially promoting the production of aromatic hydrocarbons through the hydrocarbon pool mechanism and the Diels–Alder reaction, with the latter proposed to play a vital role in aromatic hydrocarbon formation.