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- Title
Micelles Cascade Assembly to Tandem Porous Catalyst for Waste Plastics Upcycling.
- Authors
Feng, Jiayou; Duan, Jindi; Hung, Chin‐Te; Zhang, Zhenghao; Li, Kailin; Ai, Yan; Yang, Chaochao; Zhao, Yiyue; Yu, Zhengmin; Zhang, Yahong; Wang, Liang; Zhao, Dongyuan; Li, Wei
- Abstract
Catalytic upcycling of polyolefins into high‐value chemicals represents the direction in end‐of‐life plastics valorization, but poses great challenges. Here, we report the synthesis of a tandem porous catalyst via a micelle cascade assembly strategy for selectively catalytic cracking of polyethylene into olefins at a low temperature. A hierarchically porous silica layer from mesopore to macropore is constructed on the surface of microporous ZSM‐5 nanosheets through cascade assembly of dynamic micelles. The outer macropore arrays can adsorb bulky polyolefins quickly by the capillary and hydrophobic effects, enhancing the diffusion and access to active sites. The middle mesopores present a nanoconfinement space, pre‐cracking polyolefins into intermediates by weak acid sites, which then transport into zeolites micropores for further cracking by strong Brønsted acid sites. The hierarchically porous and acidic structures, mimicking biomimetic protease catalytic clefts, ideally match the tandem cracking steps of polyolefins, thus suppressing coke formation and facilitating product escape. As a result, light hydrocarbons (C1‐C7) are produced with a yield of 443 mmol gZSM‐5−1, where 74.3 % of them are C3‐C6 olefins, much superior to ZSM‐5 and porous silica catalysts. This tandem porous catalyst exemplifies a superstructure design of catalytic cracking catalysts for industrial and economical upcycling of plastic wastes.
- Subjects
PLASTIC scrap; MICELLES; POROUS silica; POLYOLEFINS; CATALYSTS; CATALYTIC cracking
- Publication
Angewandte Chemie, 2024, Vol 136, Issue 26, p1
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202405252