Recyclable and (Bio)degradable Polyesters in a Circular Plastics Economy

Chemical Reviews, Год журнала: 2024, Номер 124(7), С. 4393 - 4478

Опубликована: Март 22, 2024

Polyesters carrying polar main-chain ester linkages exhibit distinct material properties for diverse applications and thus play an important role in today's plastics economy. It is anticipated that they will even greater tomorrow's circular economy focuses on sustainability, thanks to the abundant availability of their biosourced building blocks presence bonds can be chemically or biologically cleaved demand by multiple methods bring about more desired end-of-life plastic waste management options. Because this potential promise, there have been intense research activities directed at addressing recycling, upcycling biodegradation existing legacy polyesters, designing biorenewable alternatives, redesigning future polyesters with intrinsic chemical recyclability tailored performance rival commodity are either petroleum based and/or hard recycle. This review captures these exciting recent developments outlines challenges opportunities. Case studies poly(lactic acid), poly(3-hydroxyalkanoate)s, poly(ethylene terephthalate), poly(butylene succinate), poly(butylene-adipate presented, emerging recyclable comprehensively reviewed.

Язык: Английский

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Recent advances in plastic recycling and upgrading under mild conditions

Green Chemistry, Год журнала: 2023, Номер 25(18), С. 6949 - 6970

Опубликована: Янв. 1, 2023

This review summarizes the emerging advanced technologies including bio-, photo-, electro-, and low-temperature thermocatalysis for recycling upgrading of waste plastics under mild conditions.

Язык: Английский

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Review on Catalytic Depolymerization of Polyolefin Waste by Hydrogenolysis: State-of-the-Art and Outlook

Energy & Fuels, Год журнала: 2024, Номер 38(3), С. 1676 - 1691

Опубликована: Янв. 22, 2024

Mechanical recycling of plastic waste is not sustainable and inefficient in terms the resources needed to accomplish process, quality materials obtained from this technique substandard. Chemical polymers appears be preferable because technology allows for production new materials. This review compiles most recent research which selected transition metals are used as catalysts hydrogenolytic depolymerization polyolefins a polymer upcycling process. Hydrogenolysis an emerging chemical method that uses transition-metal complexes presence hydrogen cleave C–C bonds substances into shorter hydrocarbons. Transition such Ruthenium (Ru), Platinum (Pt), Nickel (Ni), Cobalt (Co), Zirconium (Zr), Tantalum (Ta), Rhodium (Rh) have been utilized recently type reaction. hydrogenolysis can produce valuable hydrocarbon products, gas/liquid fuels lubricating oils, under relatively milder operational conditions with less environmental impact. The focused on supported metal organometal catalytic system their mechanism polyolefin pathways detailed investigation impact reaction parameters high gasoline, diesel, light lubricants.

Язык: Английский

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Flash Joule heating for synthesis, upcycling and remediation

Опубликована: Янв. 15, 2025

Язык: Английский

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Design of depolymerizable polymers toward a circular economy

Green Chemistry, Год журнала: 2024, Номер 26(5), С. 2384 - 2420

Опубликована: Янв. 1, 2024

While our society is facing the challenge of accumulating plastic waste, this review discusses recent advances towards polymer circularity with an emphasis on manipulations monomer–polymer equilibrium to create chemically recyclable polymers.

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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Counterintuitive chemoselectivity in the reduction of carbonyl compounds

Nature Reviews Chemistry, Год журнала: 2024, Номер 8(7), С. 518 - 534

Опубликована: Июнь 3, 2024

Язык: Английский

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Closed-loop recyclable polymers: from monomer and polymer design to the polymerization–depolymerization cycle

Chemical Society Reviews, Год журнала: 2024, Номер 53(19), С. 9609 - 9651

Опубликована: Янв. 1, 2024

We present the state-of-the-art of circular polymers based on monomer and polymer design reversible ring-opening addition polymerization reactions without involvement other reactants.

Язык: Английский

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A silica-supported organocatalyst for polycarbonate methanolysis under mild and economic conditions

Chemical Engineering Journal, Год журнала: 2024, Номер 485, С. 149832 - 149832

Опубликована: Фев. 19, 2024

In the pursuit of circular economies aimed at eliminating waste and pollution, chemical recycling emerges as a promising avenue for transforming plastics into monomers. This study addresses need economically viable mild depolymerisation methods, focusing on poly(bisphenol A carbonate) (BPA-PC), an engineering plastic with monomer bisphenol (BPA), known xenoestrogen. Improving BPA-PC is crucial to prevent release BPA environment. Our investigation centres three commercially available organocatalyst-modified silica gels in polycarbonate (PC) methanolysis, alongside one functionalised 1,5,7-triazabicyclo-[4.4.0]-dec-5-ene (TBD), previously reported polyethylene terephthalate (PET) glycolysis. The latter Si-TBD, among these catalysts, exhibits superior catalytic activity PC methanolysis. methanolysis process was optimised by experimental design. Under optimal reaction conditions (PC: 2.00 g, methanol (n(MeOH):n(PC) = 13:1), Si-TBD: 5 mol%, 65 °C, 2 h), 96 % non-isolated yield obtained. kinetics reveals that Si-TBD-catalysed pseudo-first-order exceptionally low activation energy 44.19 kJ mol−1, lowest date. Si-TBD recycled ten cycles after regeneration, even though regenerated catalyst has slightly lower than native catalyst, good yields (72 ± 4 %) were achieved consistently. Investigations necessity inert atmosphere during indicate it not required. Impressively, demonstrates ability depolymerise room temperature, without stirring, days, excellent (94 %). Notably, this offers similar performance temperature others literature

Язык: Английский

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Co-pyrolysis of sewage sludge with hydrogen-rich polythene: Effects on synergistic promotion and bio-oil quality

Renewable Energy, Год журнала: 2024, Номер 228, С. 120673 - 120673

Опубликована: Май 16, 2024

Язык: Английский

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