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<p>Integrating plastic wastes into a circular economy via catalytic pyrolysis presents a promising strategy. This study examines the catalytic pyrolysis mechanisms of plastics with different structures (LLDPE, PP, PET, PS, PAN, PU, AS, and ABS) over HZSM-5 zeolite using a fixed-bed reactor to clarify thermal decomposition behaviors, product pathways, and aromatic/coke formation. Structural differences in plastics show minimal impact on thermal decomposition termination temperatures. Polyolefins preferentially yielded light olefins, while plastics rich in phenyl-branched structures favored pyrolytic oil production. LLDPE outperforms others in light aromatics generation, achieving 71.53% BTEX selectivity in oil. Branched-chain hydrocarbons from plastics cracking tend to excessive cyclization, accelerating polycyclic aromatic hydrocarbons and coke precursor formation. In the catalytic upgrading of nitrogen-containing plastics (PAN, PU, AS, and ABS), HZSM-5 demonstrates a deficiency in denitrogenation capability. A significant amount of nitrogen-containing heterocyclic compounds was observed within the channels of the spent zeolite. While this facilitates the suppression of highly condensed PAHs, their persistent accumulation ultimately will restrict the catalytic performance of the zeolite. These findings provide valuable insights into the catalytic pyrolysis upgrading of structurally complex plastics.</p> Graphical Abstract <p></p>

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Comparison of various plastic wastes in catalytic pyrolysis process: pyrolysis behavior and product formation over HZSM-5

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Jiayu Xu,
  • Jinge Hu,
  • Taotao Wu,
  • Tongxin Sun,
  • Kezhen Qian,
  • Ying Gao,
  • Yuezhao Zhu

摘要

Integrating plastic wastes into a circular economy via catalytic pyrolysis presents a promising strategy. This study examines the catalytic pyrolysis mechanisms of plastics with different structures (LLDPE, PP, PET, PS, PAN, PU, AS, and ABS) over HZSM-5 zeolite using a fixed-bed reactor to clarify thermal decomposition behaviors, product pathways, and aromatic/coke formation. Structural differences in plastics show minimal impact on thermal decomposition termination temperatures. Polyolefins preferentially yielded light olefins, while plastics rich in phenyl-branched structures favored pyrolytic oil production. LLDPE outperforms others in light aromatics generation, achieving 71.53% BTEX selectivity in oil. Branched-chain hydrocarbons from plastics cracking tend to excessive cyclization, accelerating polycyclic aromatic hydrocarbons and coke precursor formation. In the catalytic upgrading of nitrogen-containing plastics (PAN, PU, AS, and ABS), HZSM-5 demonstrates a deficiency in denitrogenation capability. A significant amount of nitrogen-containing heterocyclic compounds was observed within the channels of the spent zeolite. While this facilitates the suppression of highly condensed PAHs, their persistent accumulation ultimately will restrict the catalytic performance of the zeolite. These findings provide valuable insights into the catalytic pyrolysis upgrading of structurally complex plastics.

Graphical Abstract