Polystyrene Waste Thermochemical Hydrogenation to Ethylbenzene by a N-Bridged Co, Ni Dual-Atom Catalyst

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(29), P. 16218 - 16227

Published: July 12, 2023

Recycling waste plastics requires the degradation of into small molecules. However, various products are widely distributed using traditional methods depolymerizing polystyrene (PS) such as catalytic pyrolysis and hydrogenolysis. Here, we creatively report a N-bridged Co, Ni dual-atom (Co-N-Ni) catalyst for targeted conversion PS to ethylbenzene via pressurized tandem fixed-bed reactor where hydropyrolysis is coupled with downstream vapor-phase hydrotreatment. The Co-N-Ni achieves 95 wt % 92 yield, significantly superior corresponding single-atom catalysts, enables real plastics. Theoretical calculations experimental results demonstrate that d-band center metal atoms well regulated in catalyst. Co site activates C═C bond more easily, while spatially optimizes adsorption configuration styrene molecule due electronic interaction. This also shows excellent durability provides new direction plastic degradation.

Language: Английский

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Electrocatalytic upcycling of polyethylene terephthalate plastic to formic acid coupled with energy-saving hydrogen production over hierarchical Pd-doped NiTe nanoarrays

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 340, P. 123236 - 123236

Published: Aug. 28, 2023

Language: Английский

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Toward carbon neutrality: Selective conversion of waste plastics into value-added chemicals

Matter, Journal Year: 2023, Volume and Issue: 6(10), P. 3322 - 3347

Published: Oct. 1, 2023

Language: Английский

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State of the art in the photochemical degradation of (micro)plastics: from fundamental principles to catalysts and applications

Journal of Materials Chemistry A, Journal Year: 2023, Volume and Issue: 11(6), P. 2503 - 2527

Published: Jan. 1, 2023

Plastics and microplastics are major environmental pollutants due to wide applications difficult degradations. Herein, we summarize several studies on degradations of (micro)plastics value-added products intermediates via photocatalysis.

Language: Английский

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Photocatalytic Valorization of Plastic Waste over Zinc Oxide Encapsulated in a Metal–Organic Framework

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(28)

Published: April 21, 2023

Abstract The conversion of waste plastic into high‐value‐added chemicals is regarded as a promising approach for relieving global pollution and contributing to the circular economy. Herein, partial calcination strategy developed fabricate zinc oxide/UiO66‐NH 2 (ZnO/UiO66‐NH ) heterojunction, in which ZnO encapsulated porous UiO66‐NH photocatalytic valorization plastic. This preserves framework structure , thus enabling formation with ultra‐small size distributed inside skeleton. synergistic effect obtained ZnO/UiO66‐NH heterojunction facilitates providing an efficient channel carrier/mass transfer guarantees structural stability. As result, exhibits high activity converting polylactic acid (PLA) polyvinyl chloride (PVC) acetic acid, coupled H production. work provides feasible rationally designing photocatalysts, well insight understanding process

Language: Английский

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Upcycling plastic waste to carbon materials for electrochemical energy storage and conversion

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 461, P. 141962 - 141962

Published: Feb. 20, 2023

Language: Английский

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Electrocatalytic Waste-Treating-Waste Strategy for Concurrently Upgrading of Polyethylene Terephthalate Plastic and CO₂ into Value-Added Formic Acid

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(21), P. 14163 - 14172

Published: Oct. 20, 2023

Polyethylene terephthalate (PET) plastic and CO2 pollution have seriously threatened the ecological environment caused a huge waste of carbon resources. Herein, we report an electrocatalytic waste-treating-waste strategy for concurrently upgrading PET wastes into value-added formic acid (HCOOH), in which both anode (oxygen-vacancy-rich Ni(OH)2-VO) cathode (Bi/Bi2O3 heterostructure) electrocatalysts were elaborately designed from derivatives. Impressively, as-prepared Ni(OH)2-VO Bi/Bi2O3 achieve high selectivity HCOOH (86 91%, respectively) with industrial-level current densities at ultralow potentials (300 mA cm–2 1.6 V −272 −1.4 V, respectively). Further experimental theoretical results reveal that abundant oxygen vacancies will largely facilitate formation Ni3+ species accelerate subsequent processes dehydrogenation C–C bond breakage during upcycling. Meanwhile, interface electron transfer Bi2O3 to Bi benefits keeping valence sites optimizes adsorption OCHO* intermediate, thereby endowing efficient performance toward reduction HCOOH. As proof concept, solar-powered flow reactor real-time monitoring control functions was designed, realized record Faradaic efficiency 181% This work offers opportunities utilization provides constructive guidance design advanced converting valuable chemicals.

Language: Английский

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Chemical recycling of polyolefins: a closed-loop cycle of waste to olefins

National Science Review, Journal Year: 2023, Volume and Issue: 10(9)

Published: Aug. 2, 2023

The unsuitable disposal of plastic wastes has caused serious environmental pollution, and finding a green manner to address this problem aroused wide concern. Plastic wastes, especially polyolefin are rich in carbon hydrogen, chemical recycling shows distinct advantages their conversion into olefins realizes closed-loop cycling wastes. should be labeled before disposal. necessity for, methods of, pretreatment introduced paper the whole process is also summarized. As core technology pyrolysis, including thermal, catalytic solvolysis processes, detail due its potential for future development. We briefly describe feasible strategies pyrolytic oil refining life cycle assessment process. In addition, suggestions perspectives concerning industrial improvement proposed.

Language: Английский

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From Plastic Waste to Treasure: Selective Upcycling through Catalytic Technologies

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(41)

Published: Sept. 24, 2023

The huge amount of plastic wastes has become a pressing global environmental problem, leading to severe pollution and resource depletion through conventional downcycling technologies like incineration landfilling. In contrast, selective upcycling various plastics offers promising solution for converting waste into valuable products. This review provides comprehensive overview the recent advancements in innovative catalytic technologies, including thermocatalysis, electrocatalysis, photocatalysis. Special emphasis is placed on elucidating reaction mechanisms, activating designated chemical bonds high selectivity, elaborating above techniques terms conditions Finally, application prospects future development trends catalysis are discussed, providing insights realizing sustainable circular economy.

Language: Английский

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Light-driven polymer recycling to monomers and small molecules

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: March 20, 2024

Abstract Only a small proportion of global plastic waste is recycled, which most mechanically recycled into lower quality materials. The alternative, chemical recycling, enables renewed production pristine materials, but generally comes at high energy cost, particularly for processes like pyrolysis. This review focuses on light-driven approaches chemically recycling and upcycling waste, with emphasis reduced consumption selective transformations not achievable heat-driven methods. We focus challenging to recycle backbone structures composed mainly C‒C bonds, lack functional groups i.e., esters or amides, that facilitate e.g., by solvolysis. discuss the use light, either in conjunction heat drive depolymerization monomers via photocatalysis transform polymers valuable molecules. structural prerequisites these are outlined, highlighting their advantages as well limitations. conclude an outlook, addressing key challenges, opportunities, provide guidelines future photocatalyst (PC) development.

Language: Английский

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