Chemical upcycling of polyethylene, polypropylene, and mixtures to high-value surfactants

Science, Journal Year: 2023, Volume and Issue: 381(6658), P. 666 - 671

Published: Aug. 10, 2023

Conversion of plastic wastes to fatty acids is an attractive means supplement the sourcing these high-value, high-volume chemicals. We report a method for transforming polyethylene (PE) and polypropylene (PP) at ~80% conversion with number-average molar masses up ~700 670 daltons, respectively. The process applicable municipal PE PP their mixtures. Temperature-gradient thermolysis key controllably degrading into waxes inhibiting production small molecules. are upcycled by oxidation over manganese stearate subsequent processing. ꞵ-scission produces more olefin wax yields higher acid-number than does ꞵ-scission. further convert large-market-volume surfactants. Industrial-scale technoeconomic analysis suggests economic viability without need subsidies.

Language: Английский

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Sustainable developments in polyolefin chemistry: Progress, challenges, and outlook

Progress in Polymer Science, Journal Year: 2023, Volume and Issue: 143, P. 101713 - 101713

Published: June 25, 2023

Language: Английский

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Catalytic Upcycling of Polyolefins

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(16), P. 9457 - 9579

Published: Aug. 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.

Language: Английский

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Catalytic hydroconversion processes for upcycling plastic waste to fuels and chemicals

Catalysis Science & Technology, Journal Year: 2022, Volume and Issue: 13(5), P. 1258 - 1280

Published: Dec. 15, 2022

This review provides an overview of catalytic hydroconversion processes including hydrocracking, hydrogenolysis and hydrodeoxygenation for upcycling plastic wastes into fuels valuable chemicals.

Language: Английский

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Encapsulation of carbon-nanodots into metal-organic frameworks for boosting photocatalytic upcycling of polyvinyl chloride plastic

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 341, P. 123355 - 123355

Published: Oct. 1, 2023

Although polyvinyl chloride (PVC) ranks as the third most mass-produced synthetic plastic, chemical upcycling of non-biodegradable PVC waste remains a significant challenge. Herein, carbon nanodots combined with metal-organic framework (CDs/Zr-MOF) are fabricated for photocatalytic PVC. Specifically, ultra-small-sized CDs (~2.0 nm) encapsulated into Zr-MOF pores via mild pyrolysis strategy. The maintained MOF structure facilitates charge/mass transfer and improves surface-to-volume ratio active sites CDs. CDs/Zr-MOF exhibits high activity conversion ~76.5% towards acetic acid yield ~14%. mechanism investigation indicates generated •OH radicals can efficiently trigger cleavage C-Cl/C-C bonds Moreover, reduction energy barrier hydroxylation reaction rate-limiting step contributed to improved performance. This work offers feasible method fabricating nanoparticle-embedded MOF-based photocatalysts provides new insights plastics.

Language: Английский

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Design of a bifunctional catalyst by alloying Ni with Ru-supported H-beta for selective hydrodeoxygenation of bisphenol A and polycarbonate plastic waste

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 338, P. 123021 - 123021

Published: June 21, 2023

Language: Английский

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Conversion of polyethylene waste to short chain hydrocarbons under mild temperature and hydrogen pressure with metal-free and metal-loaded MFI zeolites

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 338, P. 123028 - 123028

Published: June 24, 2023

Language: Английский

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Chemical recycling of plastic wastes via homogeneous catalysis: A review

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 479, P. 147853 - 147853

Published: Dec. 2, 2023

Language: Английский

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Dendritic copolymers from P-, N- and Si-based monomer and melamine phosphate generate thermal deformation toughening and a rapid charring flame retardant effect in polypropylene

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 471, P. 144716 - 144716

Published: July 10, 2023

Language: Английский

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Tailoring ZSM-5 zeolite through metal incorporation: Toward enhanced light olefins production via catalytic cracking: A minireview

Journal of Industrial and Engineering Chemistry, Journal Year: 2023, Volume and Issue: 126, P. 36 - 49

Published: June 8, 2023

Language: Английский

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