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Catalytic valorization of polyolefins: from catalysts and processes to reactors
Cuncun Wu1,2,3, Chaojie Guo1,2,3, Xinquan Xu1,2,3
1School of Chemical Engineering & Technology, Key Laboratory for Green Chemical Technology of Ministry of Education, Tianjin University, Tianjin 300072, China. jlgong@tju.edu.cn.
Chemical Society Reviews
|June 26, 2026
Summary
Catalytic valorization offers a sustainable solution for polyolefin waste, transforming plastics into valuable chemicals and fuels. Integrated innovation across catalysts, processes, and reactors is key to developing deployable waste conversion technologies.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Polyolefins constitute over 50% of global plastic production, yet their limited lifespan and recyclability cause significant environmental pollution and resource depletion.
- Catalytic valorization presents a viable strategy to convert polyolefin waste into high-value chemicals and fuels, addressing environmental concerns and resource loss.
Purpose of the Study:
- To review recent advancements in the catalytic valorization of polyolefins from an integrated, multiscale perspective.
- To analyze catalyst design, process engineering, and reactor development for polyolefin waste conversion.
Main Methods:
- Discussion of catalyst design principles and reaction mechanisms for metal, solid acid, bifunctional, and ionic liquid catalysts.
- Analysis of process innovations including mixed catalysts, co-conversion with small molecules (e.g., CO2, CH4), and external-field-assisted transformations (e.g., plasma, microwave).
- Review of batch, fixed-bed, and fluidized-bed reactors, focusing on heat/mass transfer, continuous operation, and scalability.
Main Results:
- Catalyst properties significantly influence reaction pathways and product selectivity in polyolefin valorization.
- Process innovations enhance catalytic activity, selectivity, and stability, improving the efficiency of waste conversion.
- Reactor design and operational parameters critically impact overall process performance and scalability.
Conclusions:
- Coordinated innovation across the catalyst-process-reactor chain is essential for deployable polyolefin valorization technologies.
- Critical gaps remain in translating lab-scale studies to real-world applications, necessitating further research and development.
- Opportunities exist to accelerate catalyst and process development for efficient and scalable polyolefin waste valorization.
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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