水素移動および芳香族化反応の抑制によるポリエチレンのプラットフォームオレフィンへの効率的な光熱リサイクル
Yingxuan Miao1,2, Xi Qian1,3, Jinhu Wang1
1Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, P. R. China.
Abstract:
The recycling of polyethylene (PE) into highly selective platform olefins holds great promise as a potential closed-loop recycling route that minimizes dependence on the petrochemical industries, whereas the selectivity of olefins is mainly limited by two side reactions: hydrogen transfer and aromatization. Herein, we present a photothermal recycling pathway that effectively converts various types of PE into highly selective olefins using ZnCrOx/HZSM-5 composite catalyst, with efficaciously suppressing both side reactions. The inclusion of ZnCrOx modifies catalyst acidity to inhibit the hydrogen transfer reaction, while jointly establishing an intra-catalyst spatial temperature gradient through distinct photothermal responses between ZnCrOx and HZSM-5 whereby the endothermic aromatization can be suppressed. This strategy achieves an impressive selectivity of 75.4% for C2-C5 hydrocarbons, with 84.7% of them being C2-C5 olefins, in the photothermal recycling of low-density PE (LDPE) under atmospheric pressure using Xe lamp irradiation. Further, the demonstrated universality across various PE feedstocks (e.g., high-density PE and commercial LDPE bags) and concentrated sunlight operation highlights a solar-powered plastic-to-olefin platform with industrial viability.
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