Nitrogenative Degradation of Polystyrene Waste

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Янв. 8, 2025

Owing to massive production and poor end-of-life management, plastic waste pollution has become one of the most pressing environmental crises. In response mounting crisis, past several decades have witnessed development numerous methods technologies for recycling. However, current recycling often produce low-quality or low-value products, making it difficult recover operating costs. To this end, we report a novel preoxygenation-induced strategy nitrogenative degradation real-life polystyrene plastics into high-value aromatic nitrogen compounds in cost-effective manner. Thus, expensive highly demanding benzonitrile as well benzamide were obtained up 74% overall isolated yield from by using CuBr catalyst, O2 oxidant, CH3CN source. Detailed mechanistic investigations indicate that hydroxyl radicals activation play role selective aerobic process. Furthermore, multiple reaction pathways contribute formation benzamide.

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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Oil recovery from microwave co-pyrolysis of polystyrene and polypropylene plastic particles for pollution mitigation

Environmental Pollution, Год журнала: 2024, Номер 356, С. 124240 - 124240

Опубликована: Май 27, 2024

Язык: Английский

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Catalytic Hydrodeoxygenation of Mixed Plastic Wastes into Sustainable Naphthenes

JACS Au, Год журнала: 2024, Номер 4(11), С. 4361 - 4373

Опубликована: Окт. 11, 2024

The chemical upcycling of plastic wastes by converting them into valuable fuels and chemicals represents a sustainable approach as opposed to landfilling incineration. However, it encounters challenges in dealing with mixed due their complex composition sorting/cleaning costs. Here, we present one-pot hydrodeoxygenation (HDO) method for containing poly(ethylene terephthalate) (PET), polycarbonate (PC), poly(phenylene oxide) (PPO) naphthenes under mild reaction conditions. To facilitate this process, developed cost-effective, contaminant-tolerant, reusable Ni/HZSM-5 bifunctional catalyst through an ethylene glycol-assisted impregnation method. metallic Ni site plays pivotal role catalyzing C-O C-C cleavages well hydrogenation reactions, while the acidic HZSM-5 facilitates dehydration isomerization reactions. collaboration between metal acid dual sites on enabled efficient HDO wide range substrates, including bottles, textile fibers, pellets, sheets, CDs/DVDs, plastics without cleaning or pigments removal even various mixtures, high yield up 99% at 250 °C 4 MPa H

Язык: Английский

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Recent Advances in Electrochemical Organic Waste Reforming: Highlights on Anodic Chemistry, Materials Design, and System Integration

ACS Applied Engineering Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 8, 2025

As renewable electricity─particularly from solar energy─becomes more cost-effective, electrochemical organic waste reforming emerges as a promising solution for green hydrogen production. This approach also offers additional advantages in low-carbon management and the coproduction of value-added chemicals. However, its broader application has been limited, mainly due to gaps understanding complex properties real mixed waste, reaction mechanisms, catalyst design, system integration. review provides fresh perspective on value technology both degradation valorization. Initially, suitability various streams processes based critical feedstock was examined. Subsequently, potential alternative anodic reactions pollutant valorization determine optimal process pathways were screened. Finally, advanced catalysts, modules, designs enhance techno-economic feasibility explored. Overall, this underscores significant sustainable production management, offering insights into feasible commercializing by addressing challenges related feedstocks, systems.

Язык: Английский

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Can the Hock Process Be Used to Produce Phenol from Polystyrene?

Journal of the American Chemical Society, Год журнала: 2025, Номер unknown

Опубликована: Фев. 26, 2025

Polystyrene (PS) is a widely used thermoplastic polymer, but its very low recycling rate has motivated consideration of chemical conversion strategies to convert waste PS into value-added products. Oxidation methods have been studied, they typically generate benzoic acid, product with relatively market demand. Phenol higher volume that would be an appealing target, no currently exist for the phenol. The repeat unit in closely resembles cumene, primary feedstock produce phenol through Hock process. Here, we investigate prospects adapting process PS, generating hydroperoxides autoxidation benzylic C-H bonds followed by acid-promoted rearrangement afford and partially oxygenated polymer. Experimental computational studies dimeric trimeric model compounds show neighboring phenyl rings impose conformational constraints raise barrier hydrogen-atom transfer from tertiary bond. These effects are also evident contribute lower yields when subjected conditions. results provide valuable insights important implications other efforts seek adapt small-molecule reactivity polymeric feedstocks.

Язык: Английский

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Polyethylene hydrogenolysis by dilute RuPt alloy to achieve H2-pressure-independent low methane selectivity

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Дек. 4, 2024

Chemical recycling of plastic waste could reduce its environmental impact and create a more sustainable society. Hydrogenolysis is viable method for polyolefin valorization but typically requires high hydrogen pressures to minimize methane production. Here, we circumvent this stringent requirement using dilute RuPt alloy suppress the undesired terminal C–C scission under hydrogen-lean conditions. Spectroscopic studies reveal that PE adsorption takes place on both Ru Pt sites, yet bond cleavage proceeds faster site, which helps avoid successive in situ-generated reactive intermediates due lack neighboring site. Different from previous research, suppressing generation independent H2 pressure, can be converted fuels waxes/lubricant base oils with only <3.2% even ambient pressure. This advantage would allow integration distributed, low-pressure sources into upstream hydrogenolysis provide feasible solution decentralized upcycling. polyolefins often produces excessive low by alloy, authors successfully prevent sequential cleavage, enabling flexible use various localized recycling.

Язык: Английский

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Selectivity switch via tuning surface static electric field in photocatalytic alcohol conversion

The Innovation, Год журнала: 2024, Номер 5(5), С. 100659 - 100659

Опубликована: Июнь 18, 2024

Photocatalysis has shown great potential in organic reactions, while controlling the selectivity is a long-standing goal and challenge due to involvement of various radical intermediates. In this study, we have realized control photocatalytic conversion alcohols via engineering surface static electric field CdS semiconductor. By leveraging Au-CdS interaction adjust lattice strain, which influences intensity field, altered pathways alcohol conversion. The increased changed activation C-H/O-H bond, leading selective formation targeted C/O-based intermediates altering from aldehydes dimers. A wide range alcohols, such as aromatic thiophenol alcohol, were selectively converted into aldehyde or dimer. This work provides an effective strategy for reaction by generating field.

Язык: Английский

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Photocatalysis as a tool for upcycling of polymers

Trends in Chemistry, Год журнала: 2024, Номер 6(7), С. 392 - 405

Опубликована: Июнь 15, 2024

Язык: Английский

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A multiscale interphase heat transfer model for fluidized beds based on the steady-state EMMS approach

Chemical Engineering Science, Год журнала: 2024, Номер 298, С. 120408 - 120408

Опубликована: Окт. 1, 2024

Язык: Английский

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