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A Comprehensive Review of PET Chemical Depolymerization: Mechanisms, Catalyst Design, and Process Intensification Toward Closed‐Loop Recycling
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This review summarizes existing research on chemical methods for breaking down PET plastic into reusable building blocks. It covers different chemical reaction types, catalyst designs that speed up the process, and techniques like microwave heating, aimed at making plastic recycling more efficient and practical for industry.
The massive accumulation of polyethylene terephthalate (PET) waste necessitates efficient recycling technologies to mitigate environmental pollution. Chemical depolymerization converts PET into high-purity monomers, offering a promising route for closed-loop plastic circularity. This review systematically summarizes recent advances in catalytic PET depolymerization, emphasizing reaction mechanisms, catalyst design, and process intensification. We analyze major depolymerization routes, namely hydrolysis, methanolysis, glycolysis, and aminolysis while highlighting fundamental mechanistic insights such as nucleophilic transesterification and emerging β-cleavage pathways. Furthermore, we evaluate catalyst design principles for active sites (e.g., Brønsted and Lewis acids, bridged bimetallic centers, and defect-engineered structures) across various homogeneous and heterogeneous systems, including ionic liquids, metal-organic frameworks, and zeolites. Finally, we highlight recent progress in process intensification strategies, such as interfacial catalysis, microwave-assisted reactions, and tandem one-pot processes. By integrating mechanistic understanding with catalyst engineering, this review provides a comprehensive perspective and outlines future directions for sustainable, industrially viable closed-loop PET recycling.
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Research progress on chemical depolymerization and upcycling of PET waste plastics
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This review examines recent advances in chemical methods for breaking down polyethylene terephthalate (PET) waste plastics into useful raw materials. Researchers surveyed techniques including glycolysis, methanolysis, hydrolysis, and aminolysis that can convert PET back into monomers for reuse. The study highlights chemical depolymerization as a promising approach to reduce plastic pollution while recovering valuable materials from waste.
Comparsion of Catalyst Effectiveness in Different Chemical Depolymerization Methods of Poly(ethylene terephthalate)
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This review compares the effectiveness of different catalysts used in chemical recycling methods for polyethylene terephthalate (PET) plastic. The study covers hydrolysis, methanolysis, glycolysis, and other depolymerization approaches, comparing key process parameters like temperature, reaction time, and yields to help identify the most efficient PET recycling strategies.
Theoretical insights into chemical recycling of polyethylene terephthalate (PET)
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"This review provides a comprehensive analysis of the reaction mechanisms and kinetics underlying five chemical recycling methods for polyethylene terephthalate (PET) — ammonolysis, aminolysis, hydrolysis, alcoholysis, and glycolysis — finding that glycolysis with heterogeneous catalysts and microwave-assisted heating represents the most promising pathway for efficient monomer recovery. Researchers conclude that advancing novel catalysts that exploit synergic reaction mechanisms is critical for making PET chemical recycling economically viable at industrial scale."
Mechanochemical and Mechanobiological Recycling of Postconsumer Polyethylene terephthalate (PET) Plastics under Microwave irradiation: A comparative study.
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Researchers developed a rapid mechanical pretreatment using microwave irradiation to improve PET plastic recycling under mild, environmentally friendly conditions. More efficient PET recycling reduces the amount that ends up in landfills or the environment, where it breaks down into microplastics.
Advanced Catalytic Strategies for Plastic Depolymerization: Mechanistic Insights, Catalyst Engineering, and Sustainable Upcycling Pathways
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Researchers reviewed catalytic approaches to breaking down plastic waste — including homogeneous, heterogeneous, biocatalytic, photocatalytic, and plasma-assisted methods — cataloguing the mechanistic pathways, catalyst design strategies, and emerging technologies needed to convert polyethylene, polystyrene, PET, and polypropylene into reusable monomers and fuels.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.