Upgrading polyolefin plastics: experiences from petroleum refining and distinct characteristics

Science China Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 19, 2025

Language: Английский

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Harnessing Non-Thermal External Stimuli for Polymer Recycling

Macromolecules, Journal Year: 2025, Volume and Issue: 58(5), P. 2210 - 2223

Published: Feb. 18, 2025

Polymeric materials have become indispensable due to their versatility and low cost, yet environmental impact presents a significant global challenge. Traditional chemical recycling methods typically rely on heat as stimulus; for instance, pyrolysis is popular methodology which faces limitations high energy consumption, product selectivity, the generation of undesirable byproducts. In response, recent advances in promotion depolymerization degradation through alternative stimuli such light, electrochemistry, mechanical force, shown promising potential more efficient selective polymer breakdown, yielding either starting monomers or valuable small molecules. This perspective explores key examples these emerging strategies, highlighting improve upon current protocols offer pathways under milder conditions, while identifying challenges that future research must address translate chemistry into viable broadly applicable strategies.

Language: Английский

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Insights into Chemical Recycling and Upgrading Strategies for Polyolefin-Based Plastics

Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: 64(11), P. 5765 - 5781

Published: March 5, 2025

Plastic waste, particularly the dominant polyolefins, presents a growing environmental issue due to its chemical stability and low recycling rates. Although various methods are proposed address plastic strong carbon–carbon bonds within as well degradation of mechanical strength additional value by conventional methods, pose great challenges their downstream usage. With this regard, paper emphasizes polyolefins into renewable resources, including carbon materials, liquid fuels, hydrocarbon chemicals, thermal catalytic methods. An in-depth discussion on feasibility limitations promising techniques is provided, such association between reactor design, process optimization, catalyst preparation, product distribution. Specifically, structure–function relationship over different catalysts was highlighted, molecular sieve, precious metal, transition ion liquid. In addition, future challenge regarding simultaneous treatment mixed plastics also summarized, along with copyrolysis waste biomass. As such, underscores sustainable scalable solutions for polyolefin upcycling, which may shed light upon industrial application resources.

Language: Английский

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Unveiling Mechanically Driven Catalytic Processes: Beyond Piezocatalysis to Synergetic Effects

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

Mechanically driven catalysis (MDC) has emerged as an effective strategy for environmental remediation, renewable energy conversion, and cancer therapy; this functions by converting mechanical forces to drive catalytic reactions. This review examines four primary mechanisms, namely, piezocatalysis, flexocatalysis, tribocatalysis, sonocatalysis, each involving specific pathways harnessing at the nanoscale. However, significant challenges arise in decoupling effects related individual mechanism order better understand manipulate their synergies. In review, fundamental principles underpinning MDC are systematically interpreted. Beyond mechanistic insights, recent advancements performance enhancement strategies these catalysts highlighted. Potential applications using approaches remediation (pollutant antibiotic degradation microbial disinfection), conversion (hydrogen production greenhouse gas conversion), biomedical treatments (particularly therapy) discussed. Finally, synergies limiting factors explored, addressing overlooked combined of ultrasound activation source, complexities force interactions nanoscale, need targeted application strategies. Additionally, industrial potential processes with consideration scalability practical deployment is evaluated. While remain, provides a roadmap advancing mechanically catalyst design implementation toward real-world applications, offering into its future trajectory transformative impact across numerous fields.

Language: Английский

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Mechanochemical Treatment of Waste Poly (Vinyl Chloride) for Alcohol Halogenation by Ball Milling and Triboelectric Material

Published: Oct. 22, 2024

Polyvinyl chloride (PVC), one of the most extensively produced polymers, has raised significant environment and public health concerns due to its persistence in ecosystem, long-term accumulation associated toxicity. The well-established mechanical recycling approach for treating waste PVC often result polymer degradation release hazardous by-products, such as corrosive HCl. We envisage that tandem with a halogenation reaction provide new solution management. Herein, we demonstrated plastic could serve chlorination reagents, combination triboelectric catalyst, achieve efficient alcohols under ball milling condition. TiO2, mediates single electron transfer process promotes dehydrochlorination PVC, thereby enabling in-situ alcohols. This strategy was applicable variety aliphatic benzylic alcohols, yielding corresponding organic chlorides moderate excellent yields. In particular, yield benzyl reached 95% after 4 h milling. Structural analysis confirmed formed by contained olefin, carbonyl aromatic structures. Additionally, Cl be completely removed, molecular weight decreased from 65.0 kDa 4.6 reusing five times. mechanochemical also successfully applied real plastics applications scale-up experiments. Overall, this method provides inspiration using chlorine source initiate chemical reactions through approaches.

Language: Английский

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Influence of ball milling parameters on the mechano-chemical conversion of polyolefins

RSC Mechanochemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 18, 2024

Mechano-chemical plastic recycling suffers from low overall yields. We identified the role of key parameters to maximize mechanical impact increase productivity small hydrocarbons, such as propene, polypropylene.

Language: Английский

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