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<p>The recycling of waste plastics has emerged as an urgent environmental issue. This study evaluated the potential of pyrolysis as an efficient thermochemical treatment for mixed waste plastics. Pyrolysis experiments were conducted on major plastics (PE, PP, PS, PET) and their mixtures, with quantitative analysis of syngas (H₂, CO) yield and composition. Mixed plastics showed distinct material balance differences compared to single plastics, with liquid products decreasing by up to 37% and gas products increasing by over 50%. Aromatic polymers such as PS and PET favored hydrogen generation and enhanced overall gas quality. Applying a Ru–Al₂O₃ catalyst further improved syngas composition, increasing H₂ content by up to 26% and reducing hydrocarbons such as CH₄. While the catalyst did not significantly change total material yields, it increased the potential for producing hydrogen-rich, high-value energy. These findings highlight the feasibility of pyrolysis-based energy conversion for mixed plastics that are difficult to separate, offering a practical solution to address both waste management and sustainable energy goals. The study demonstrates that catalytic pyrolysis can optimize gas composition, particularly hydrogen production, making it a promising approach for high-efficiency waste-to-energy systems.</p>

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Syngas properties from the pyrolysis of mixed plastics: influence of polymer type and mixing conditions

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Daegi Kim,
  • Seunghyun Lee,
  • Doo Young Oh,
  • Ki Young Park

摘要

The recycling of waste plastics has emerged as an urgent environmental issue. This study evaluated the potential of pyrolysis as an efficient thermochemical treatment for mixed waste plastics. Pyrolysis experiments were conducted on major plastics (PE, PP, PS, PET) and their mixtures, with quantitative analysis of syngas (H₂, CO) yield and composition. Mixed plastics showed distinct material balance differences compared to single plastics, with liquid products decreasing by up to 37% and gas products increasing by over 50%. Aromatic polymers such as PS and PET favored hydrogen generation and enhanced overall gas quality. Applying a Ru–Al₂O₃ catalyst further improved syngas composition, increasing H₂ content by up to 26% and reducing hydrocarbons such as CH₄. While the catalyst did not significantly change total material yields, it increased the potential for producing hydrogen-rich, high-value energy. These findings highlight the feasibility of pyrolysis-based energy conversion for mixed plastics that are difficult to separate, offering a practical solution to address both waste management and sustainable energy goals. The study demonstrates that catalytic pyrolysis can optimize gas composition, particularly hydrogen production, making it a promising approach for high-efficiency waste-to-energy systems.