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<p>The continuous increases in the amount of plastic waste generated, as well as the associated environmental concerns, emphasize the need for effective upgrading processes based on thermochemical conversion technologies. This study upgraded waste plastic pyrolysis (WPP) wax via aqueous-phase reforming (APR) with glycerol to facilitate depolymerization and hydrogenation. Various catalysts (Pt/C, Ru/C, Ni/Al₂O₃, and zeolite Y) were used under different reaction conditions (temperature: 200 or 300&#xa0;°C; glycerol concentration: 10% or 20%) to evaluate the changes in the properties of the upgraded oil. Elemental and gas chromatography–mass spectrometry analyses revealed significant differences in the hydrocarbon composition and hydrogenation efficiency, which depended on both the catalyst type and reaction conditions. Notably, Pt/C exhibited a superior catalytic performance, with the paraffin content increasing substantially (up to 76 area%) at 300&#xa0;°C as the glycerol concentration increased, while the contents of olefins and polycyclic aromatic compounds significantly decreased, indicating effective hydrogenation. Overall, the glycerol-assisted APR process using Pt/C showed potential as an efficient approach for upgrading WPP wax without requiring an external hydrogen supply.</p> Graphical abstract <p></p>

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Upgrading of waste plastic pyrolysis product via aqueous-phase reforming with glycerol and various catalysts

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Eun Bi Song,
  • Byung Hwan Um

摘要

The continuous increases in the amount of plastic waste generated, as well as the associated environmental concerns, emphasize the need for effective upgrading processes based on thermochemical conversion technologies. This study upgraded waste plastic pyrolysis (WPP) wax via aqueous-phase reforming (APR) with glycerol to facilitate depolymerization and hydrogenation. Various catalysts (Pt/C, Ru/C, Ni/Al₂O₃, and zeolite Y) were used under different reaction conditions (temperature: 200 or 300 °C; glycerol concentration: 10% or 20%) to evaluate the changes in the properties of the upgraded oil. Elemental and gas chromatography–mass spectrometry analyses revealed significant differences in the hydrocarbon composition and hydrogenation efficiency, which depended on both the catalyst type and reaction conditions. Notably, Pt/C exhibited a superior catalytic performance, with the paraffin content increasing substantially (up to 76 area%) at 300 °C as the glycerol concentration increased, while the contents of olefins and polycyclic aromatic compounds significantly decreased, indicating effective hydrogenation. Overall, the glycerol-assisted APR process using Pt/C showed potential as an efficient approach for upgrading WPP wax without requiring an external hydrogen supply.

Graphical abstract