Chemical upcycling of polyethylene (PE) waste presents a viable and promising approach to address the issues of plastic waste accumulation. However, developing cost-effective and efficient routes for converting PE waste into value-added products remains a challenging task. Here, we report a one-pot, dual-catalyst system for efficient conversion of PE into gasoline without the need for noble-metal catalysts, external hydrogen, or solvents. A gasoline yield of up to 87% is achieved over a dual-catalyst system comprising WZr-KIT-6 and HZSM-5 at 240°C. The WZr-KIT-6 catalyst facilitated the activation and pre-cracking of PE chains into unsaturated oligomers over Si-O-Zr and W-O(H)-Zr sites. These unsaturated oligomers, characterized by increased mobility and reactivity, were subsequently converted into C₄–C₁₂ gasoline-range compounds through β-scission, isomerization, and hydride transfer over HZSM-5. The synergistic reaction mechanism over mesoporous and microporous materials was crucial for enhancing the efficiency and selectivity of PE conversion.

中文翻译：

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通过双催化剂系统将聚乙烯废料单锅催化转化为汽油


聚乙烯 （PE） 废物的化学升级回收是解决塑料废物积累问题的可行且有前途的方法。然而，开发将 PE 废物转化为增值产品的成本效益和高效路线仍然是一项具有挑战性的任务。在这里，我们报道了一种单罐双催化剂系统，无需惰性金属催化剂、外部氢气或溶剂即可将 PE 高效转化为汽油。在 240°C 下，由 WZr-KIT-6 和 HZSM-5 组成的双催化剂系统可实现高达 87% 的汽油收率。 WZr-KIT-6 催化剂促进了 PE 链在 Si-O-Zr 和 W-O（H）-Zr 位点上的活化和预裂解为不饱和低聚物。这些不饱和低聚物的特点是迁移率和反应性增加，随后通过 HZSM-5 上的β裂、异构化和氢化物转移转化为 C₄–C₁₂ 汽油系列化合物。介孔和微孔材料上的协同反应机理对于提高 PE 转化的效率和选择性至关重要。