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Decoupling Acidity from Micropore Confinement in an Amorphous-Crystalline Composite for Selective Polyolefin Waste
Qiaohui Ruan1, Hailu Xia1, Zanfeng Yuan1
1Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China.
Journal of the American Chemical Society
|December 29, 2025
Summary
This study introduces a novel amorphous-crystalline composite catalyst for efficient polyolefin plastic waste conversion. The new catalyst significantly boosts valuable olefin production while minimizing environmental impact.
Area of Science:
- Catalysis
- Materials Science
- Environmental Chemistry
Background:
- Polyolefin plastic waste accumulation presents a major environmental issue.
- Conventional zeolite catalysts face limitations in efficiency and stability due to poor accessibility and coking.
- Sustainable conversion of plastic waste into olefins is crucial for a circular economy.
Purpose of the Study:
- To develop a novel catalyst for efficient and selective conversion of polyolefin waste into valuable olefins.
- To overcome the limitations of conventional microporous zeolite catalysts.
- To establish a generalizable design strategy for solid acid catalysts.
Main Methods:
- Design and synthesis of a rationally designed amorphous-crystalline composite (ACC) catalyst.
- Integration of short-range ordered SOD-type domains into an amorphous aluminosilicate matrix.
- Characterization of the catalyst's structure-activity relationship in low-density polyethylene cracking.
Main Results:
- The optimized ACC catalyst achieved 94.92% C3-C5 olefin selectivity and 88.08 wt% yield in polyethylene cracking.
- The ACC catalyst significantly outperformed commercial ZSM-5 and USY catalysts.
- Exceptional stability over 20 cycles with minimal coke formation (1.13 wt%) was observed.
- Broad applicability across various polyolefins and postconsumer plastic wastes was demonstrated.
Conclusions:
- The developed ACC catalyst effectively decouples acidity from micropore confinement, enhancing C-C bond scission.
- This hybrid architecture offers open diffusion channels and accessible acid sites, suppressing secondary reactions.
- The study presents a generalizable strategy for designing advanced solid acid catalysts for sustainable plastic waste valorization.
