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<p>Upcycling plastic waste into valuable resources without solvents, precious metals, or additional H<sub>2</sub> under mild conditions is a formidable challenge that requires new innovations. Herein, we document a catalyst based on Al<sub>2</sub>O<sub>3</sub> beads and zeolite ZSM-5 (ZSM-5#Al<sub>2</sub>O<sub>3</sub>(2 h)). It cracked polyethylene (PE) into gasoline-range C<sub>4</sub> − C<sub>12</sub> hydrocarbons with a selectivity of 98% and a&#xa0;yield of &gt;71% within 1.5 h at 260 °C. Characterization of the catalysts revealed a mesoporous structure and suitable Brønsted acid sites, which promoted the diffusion and catalytic activation of PE. Adjusting the dosage of zeolite supported on Al<sub>2</sub>O<sub>3</sub> beads enables regulation of both the number and strength of acidic sites. Theoretical calculations confirmed that the interfacial interaction between zeolite ZSM-5 and Al<sub>2</sub>O<sub>3</sub> reduces the acid strength of the composite. This is beneficial for the formation of higher hydrocarbons. Remarkably, the process was performed in a 1 L CSTR unit. These results provide&#xa0; instructive guidance for the design of high-performance catalytic materials used in PE waste recycling.</p><p></p>

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Solvent- and metal-free upcycling of low-density polyethylene using a practical ZSM-5/Al2O3 bead catalyst

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月24日

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  • Fei Wang,
  • Qi Dong,
  • Yanchao Liu,
  • Zhixing Li,
  • Wenming Hao,
  • Jinghong Ma,
  • Haijun Jiao,
  • Jiajun Zheng,
  • Niklas Hedin,
  • Ruifeng Li

摘要

Upcycling plastic waste into valuable resources without solvents, precious metals, or additional H2 under mild conditions is a formidable challenge that requires new innovations. Herein, we document a catalyst based on Al2O3 beads and zeolite ZSM-5 (ZSM-5#Al2O3(2 h)). It cracked polyethylene (PE) into gasoline-range C4 − C12 hydrocarbons with a selectivity of 98% and a yield of >71% within 1.5 h at 260 °C. Characterization of the catalysts revealed a mesoporous structure and suitable Brønsted acid sites, which promoted the diffusion and catalytic activation of PE. Adjusting the dosage of zeolite supported on Al2O3 beads enables regulation of both the number and strength of acidic sites. Theoretical calculations confirmed that the interfacial interaction between zeolite ZSM-5 and Al2O3 reduces the acid strength of the composite. This is beneficial for the formation of higher hydrocarbons. Remarkably, the process was performed in a 1 L CSTR unit. These results provide  instructive guidance for the design of high-performance catalytic materials used in PE waste recycling.