Asian Journal of Emerging Research, Journal Year: 2024, Volume and Issue: 6(1), P. 74 - 106
Published: Dec. 7, 2024
Language: Английский
ACS Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 4570 - 4578
Published: March 4, 2025
Polyesters, especially polyethylene terephthalate (PET), are widely used in plastic bottles and clothing fibers because of their stability cost-effectiveness. Upcycling waste polyesters into value-added materials not only solves the environmental crisis but also realizes significant economic interests. Here, we report a step-economic two-step catalytic process for upcycling polyester materials, specifically PET, 1,4-cyclohexanedimethanol (CHDM), an essential monomer functional key feedstock liquid crystal industry. The combination PET methanolysis hydrogenation aromatic rings significantly reduces reaction temperature energy consumption depolymerization which introduces remarkable engineering benefits. By developing CO-resistant bifunctional Ru/MnO2 CuZnZr mixed oxide catalyst system, is demonstrated to be converted completely with final yield CHDM up 78%. implementation transforming holds implications advancing value chain contributing material utilization renewable future.
Language: Английский
Citations
2
Science China Chemistry, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 3, 2025
Language: Английский
Citations
1
ACS Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 6287 - 6295
Published: April 3, 2025
Language: Английский
Citations
1
JACS Au, Journal Year: 2024, Volume and Issue: 4(11), P. 4361 - 4373
Published: Oct. 11, 2024
The chemical upcycling of plastic wastes by converting them into valuable fuels and chemicals represents a sustainable approach as opposed to landfilling incineration. However, it encounters challenges in dealing with mixed due their complex composition sorting/cleaning costs. Here, we present one-pot hydrodeoxygenation (HDO) method for containing poly(ethylene terephthalate) (PET), polycarbonate (PC), poly(phenylene oxide) (PPO) naphthenes under mild reaction conditions. To facilitate this process, developed cost-effective, contaminant-tolerant, reusable Ni/HZSM-5 bifunctional catalyst through an ethylene glycol-assisted impregnation method. metallic Ni site plays pivotal role catalyzing C-O C-C cleavages well hydrogenation reactions, while the acidic HZSM-5 facilitates dehydration isomerization reactions. collaboration between metal acid dual sites on enabled efficient HDO wide range substrates, including bottles, textile fibers, pellets, sheets, CDs/DVDs, plastics without cleaning or pigments removal even various mixtures, high yield up 99% at 250 °C 4 MPa H
Language: Английский
Citations
4
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 157249 - 157249
Published: Oct. 1, 2024
Language: Английский
Citations
4
Chemical Communications, Journal Year: 2024, Volume and Issue: unknown
Published: Jan. 1, 2024
Progress in chemical recycling of waste polyesters (waste plastic refinery) was reviewed and prospected, newly reported thermal catalysis, photocatalysis, electrocatalysis, biocatalysis the recycle PET-based product were introduced.
Language: Английский
Citations
4
Angewandte Chemie International Edition, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 6, 2025
Poly(ethylene terephthalate) (PET), with an annual production of exceeding 70 million tons, is mainly utilized in disposable fields and subsequently contribute to severe environmental pollution. Conventional chemical recycling, which typically involves depolymerizing polymer into monomers, limited due the intricate recycling process, excess using unrecyclable solvents low conversion. Inspired by protein's molecular switches, we propose a novel polymer-to-polymer strategy based on polycondensation principles upcycling waste PET high-value recyclable poly(ethylene-co-1,4-cyclohexanedimethanol derivatives containing switches. Upon deactivating switch, acidification reaction occurs within system, leading rapid controllable reduction weight imbalance reactive group. Conversely, activating switch triggers ring-closing that detaches acid anhydrides, bringing about equal molar ratio groups thereby facilitating increase weight. By simply incorporating condensation products melt polycondensation, closed-loop capability achieved without necessitating excessive organic or complex depolymerization processes. The present study not only presents pathway for end-of-use but also introduces innovative concept switching recyclability polymers, demonstrating significant potential large-scale implementation.
Language: Английский
Citations
0
Angewandte Chemie, Journal Year: 2025, Volume and Issue: unknown
Published: Feb. 6, 2025
Abstract Poly(ethylene terephthalate) (PET), with an annual production of exceeding 70 million tons, is mainly utilized in disposable fields and subsequently contribute to severe environmental pollution. Conventional chemical recycling, which typically involves depolymerizing polymer into monomers, limited due the intricate recycling process, excess using unrecyclable solvents low conversion. Inspired by protein's molecular switches, we propose a novel polymer‐to‐polymer strategy based on polycondensation principles upcycling waste PET high‐value recyclable poly(ethylene‐ co ‐1,4‐cyclohexanedimethanol derivatives containing switches. Upon deactivating switch, acidification reaction occurs within system, leading rapid controllable reduction weight imbalance reactive group. Conversely, activating switch triggers ring‐closing that detaches acid anhydrides, bringing about equal molar ratio groups thereby facilitating increase weight. By simply incorporating condensation products melt polycondensation, closed‐loop capability achieved without necessitating excessive organic or complex depolymerization processes. The present study not only presents pathway for end‐of‐use but also introduces innovative concept switching recyclability polymers, demonstrating significant potential large‐scale implementation.
Language: Английский
Citations
0
Eco-Environment & Health, Journal Year: 2025, Volume and Issue: unknown, P. 100139 - 100139
Published: Feb. 1, 2025
Ionic liquid-catalyzed methanolysis emerges as an efficient technique for transforming PET into premium-grade dimethyl terephthalate (DMT). However, incomplete depolymerization remains a major obstacle to the further industrial application of IL-catalyzed methanolysis. The proposed method utilized carbonate (DMC) solvent complete waste under mild conditions, resulting in pure DMT and ethylene (EC) within 2.5 h. use 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc]) IL catalyst significantly enhanced reaction efficiency. Spectroscopic analyses using 1H NMR FT-IR confirmed pivotal role [EMIm][OAc] establishing multiple hydrogen bonds with reactants (PET, DMC, MeOH) intermediate [ethylene glycol (EG)] during catalytic process. This system exhibited remarkable performance, achieving conversion PET, which resulted production EC yields 99% 91%, respectively. Moreover, this versatile approach is applicable upcycling wide variety commercial polyesters polycarbonates, underscoring its potential comprehensive solution plastic management.
Language: Английский
Citations
0
Applied Catalysis A General, Journal Year: 2025, Volume and Issue: unknown, P. 120233 - 120233
Published: March 1, 2025
Language: Английский
Citations
0