Catalytic Upcycling of Polyolefins

Chemical Reviews, Год журнала: 2024, Номер 124(16), С. 9457 - 9579

Опубликована: Авг. 16, 2024

The large production volumes of commodity polyolefins (specifically, polyethylene, polypropylene, polystyrene, and poly(vinyl chloride)), in conjunction with their low unit values multitude short-term uses, have resulted a significant pressing waste management challenge. Only small fraction these is currently mechanically recycled, the rest being incinerated, accumulating landfills, or leaking into natural environment. Since are energy-rich materials, there considerable interest recouping some chemical value while simultaneously motivating more responsible end-of-life management. An emerging strategy catalytic depolymerization, which portion C-C bonds polyolefin backbone broken assistance catalyst and, cases, additional molecule reagents. When products molecules materials higher own right, as feedstocks, process called upcycling. This review summarizes recent progress for four major upcycling strategies: hydrogenolysis, (hydro)cracking, tandem processes involving metathesis, selective oxidation. Key considerations include macromolecular reaction mechanisms relative to mechanisms, design transformations, effect conditions on product selectivity. Metrics describing critically evaluated, an outlook future advances described.

Язык: Английский

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Selective Upcycling of Polyolefins into High-Value Nitrogenated Chemicals

Journal of the American Chemical Society, Год журнала: 2024, Номер unknown

Опубликована: Сен. 6, 2024

The selective upcycling of polyolefins to create products increased value has emerged as an innovative approach carbon resource stewardship, drawing significant scientific and industrial interest. Although recent advancements in recycling technology have facilitated the direct conversion hydrocarbons or oxygenated compounds, synthesis nitrogenated compounds from such waste not yet been disclosed. Herein, we demonstrate a novel for by efficiently transforming range postconsumer plastic into nitriles amides. This process leverages catalytic properties manganese dioxide combination with inexpensive nitrogen source, urea, make it both practical economically viable. Our only opens new avenues creation chemicals polyolefin but also underscores critical importance valorizing resources originally derived fossil fuels. study provides strategy sustainable polyolefins.

Язык: Английский

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Catalytic chemical recycling and upcycling of polyolefin plastics

Giant, Год журнала: 2024, Номер 19, С. 100307 - 100307

Опубликована: Июнь 14, 2024

Polyolefins are the most produced and widely used polymeric materials. However, chemically inert nature of polyolefins has led to severe environmental pollution, posing a threat human sustenance development. Managing recycling polyolefin plastic waste is crucial for transition from linear sustainable circular economy. Catalytic chemical includes traditional techniques like pyrolysis photolysis, innovative methods that introduce cleavable bonds into chain closed-loop recycling. post-functionalization post-consumer materials another strategy tackle waste, aiming upgrade materials' utility contribute sustainability. Overall, developing catalytic deconstructing upcycling plastics essential encourage better reclamation practices reduce impact waste.

Язык: Английский

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Upgrading polyolefin plastics: experiences from petroleum refining and distinct characteristics

Science China Chemistry, Год журнала: 2025, Номер unknown

Опубликована: Март 19, 2025

Язык: Английский

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Recent advances in pyrolysis upcycling of waste plastics into hydrocarbon fuels on biochar-based catalysts

Applied Energy, Год журнала: 2025, Номер 391, С. 125805 - 125805

Опубликована: Апрель 12, 2025

Язык: Английский

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Laser‐Induced Plasma Effects on Bond Breaking in High‐Density Polyethylene Pyrolysis

Advanced Materials Interfaces, Год журнала: 2025, Номер unknown

Опубликована: Апрель 16, 2025

Abstract The conventional use of Laser‐Induced Breakdown Spectroscopy (LIBS) for elemental analysis in high‐density polyethylene (HDPE) limits the exploration bond behavior Physics and Chemistry. A suitable combination process parameters, exceeding dissociation threshold, enables LIBS to break HDPE bonds, facilitating laser‐induced pyrolysis. However, understanding post‐breakage, yield formation pathways, role plasma ionization across laser harmonics is crucial. An experiment conducted using three (1064, 532, 266 nm) at 20 Hz with pulse energies ranging from 3 100 mJ. intense Hα peak 656.3 nm suggests breaking due extensive C‐H hydrogen production. Interestingly, lower photon 1.17 2.3 eV 1064 532 broke attributed effects. Numerical models are used calculate temperatures electron density, classifying types. Plasma parameters such as cooling time, rate, energy expansion velocity analyzed. Results show that all contributed breaking: induced field‐induced plasma, favored intermediate multiphoton dominated by photon‐induced plasma. These findings help optimize

Язык: Английский

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Co-recycling of plastics and other waste materials

Опубликована: Апрель 28, 2025

Язык: Английский

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Fast Catalytic Pyrolysis of Waste Tire for Enhanced Monocyclic Aromatic Hydrocarbons Using Ni Modified Zsm-5 Zeolite Catalyst

Опубликована: Янв. 1, 2024

Язык: Английский

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Coupling Conversion of CO2 and High‐carbon Alkane to CO and Gasoline

ChemCatChem, Год журнала: 2024, Номер unknown

Опубликована: Окт. 23, 2024

Abstract Catalytic conversion of CO 2 to valuable products is a promising way reduce anthropogenic emission. Herein, strategy for coupling and high‐carbon alkane gasoline developed, which feasible choice the combination recycling petroleum refining. The reaches 2.6% under mild condition (270 °C), selectivity in cracking exceeds 70 wt%. Additionally, introduction improves aromatic hydrocarbons increases octane number gasoline. Mechanism studies indicate that synergistic effect between Brønsted acid centers Ni sites on Beta zeolite supported (20 wt%) catalyst (20Ni/β) plays key role reduction. Notably, 13 isotopic experiments show hydrogen produced during aromatization can be captured by , inhibiting undesired transfer pathways enhanced yield aromatics, while converted into CO.

Язык: Английский

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Heterogeneous catalysis strategies for polyolefin plastic upcycling: co-reactant-assisted and direct transformation under mild conditions

Chemical Communications, Год журнала: 2024, Номер unknown

Опубликована: Дек. 18, 2024

Overview of polyolefin (PO) plastic upcycling under mild conditions, utilizing diverse co-reactants to produce distinct product distributions.

Язык: Английский

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