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<p>Plastic pollution has become an increasingly severe environmental threat, accompanied by significant resource wastage. Polyoxymethylene (POM), a widely used engineering plastic, presents recycling challenges as conventional methods often require high temperatures or strong acids and are accompanied by the release of hazardous formaldehyde gas. In this study, we demonstrate a green and mild photothermal catalytic strategy for the upcycling of waste POM using a supported PtGa alloy catalyst. The incorporation of gallium (Ga), which exhibits strong near-infrared absorption, enhances the catalyst’s light-harvesting capability and photothermal efficiency. Under full-spectrum irradiation without external heating, the catalyst rapidly reaches elevated temperature, efficiently promoting POM depolymerization and syngas generation. Notably, light irradiation modulates the reaction pathway, achieving a high syngas yield to 20.32 mmol g<Stack> <sub>cat</sub> <sup>−1</sup> </Stack> h<sup>−1</sup> with 89.0% selectivity. This work establishes a promising strategy for the sustainable valorization of engineering plastics into high-value chemical feedstocks.</p>

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Photothermal conversion of polyoxymethylene into syngas over supported alloyed nanocrystals

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Haoyue Yang,
  • Zhongyu Li,
  • Nan Zhao,
  • Di Yang,
  • Qiao Zhang,
  • Jinxing Chen,
  • Muhan Cao

摘要

Plastic pollution has become an increasingly severe environmental threat, accompanied by significant resource wastage. Polyoxymethylene (POM), a widely used engineering plastic, presents recycling challenges as conventional methods often require high temperatures or strong acids and are accompanied by the release of hazardous formaldehyde gas. In this study, we demonstrate a green and mild photothermal catalytic strategy for the upcycling of waste POM using a supported PtGa alloy catalyst. The incorporation of gallium (Ga), which exhibits strong near-infrared absorption, enhances the catalyst’s light-harvesting capability and photothermal efficiency. Under full-spectrum irradiation without external heating, the catalyst rapidly reaches elevated temperature, efficiently promoting POM depolymerization and syngas generation. Notably, light irradiation modulates the reaction pathway, achieving a high syngas yield to 20.32 mmol g cat −1 h−1 with 89.0% selectivity. This work establishes a promising strategy for the sustainable valorization of engineering plastics into high-value chemical feedstocks.