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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Hydrocracking of Polyethylene to Gasoline-Range Hydrocarbons over a Ruthenium-Zeolite Bifunctional Catalyst System with Optimal Synergy of Metal and Acid Sites

Catalysts, Journal Year: 2025, Volume and Issue: 15(4), P. 335 - 335

Published: March 31, 2025

Chemical recycling of plastic waste, especially polyolefins, into valuable liquid fuels is considerable significance to address the serious issues raised by their threat on environmental and human health. Nevertheless, construction efficient economically viable catalytic systems remains a significant hurdle. Herein, we developed an bifunctional catalyst system comprising γ-Al2O3-supported ruthenium nanoparticles (Ru/γ-Al2O3) β-zeolite for conversion polyolefins gasoline-range hydrocarbons. A yield C5–12 paraffins up 73.4% can be obtained with polyethene as reactant at 250 °C in hydrogen. The Ru sites primarily activate initial cleavage C–H bonds polymer towards formation olefin intermediates, which subsequently go through further cracking isomerization over acid β-zeolite. Employing situ infrared spectroscopy probe–molecule model reactions, our investigation reveals that optimized proportion spatial distribution dual are pivotal tandem process. This optimization synergistically regulates kinetics accelerates intermediate transfer, thereby minimizing production side C1–4 hydrocarbons resulting from over-cracking enhancing fuels. research contributes novel insights design chemical upgrading chemicals, advancing field waste sustainable production.

Language: Английский

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Exploring novel strategies and integrated systems for photothermal catalytic hydrogen production

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 162794 - 162794

Published: April 1, 2025

Language: Английский

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Synergistic Catalysis for Recycling and Upcycling of Plastics

ACS Catalysis, Journal Year: 2025, Volume and Issue: unknown, P. 8551 - 8585

Published: May 7, 2025

Language: Английский

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