Enhancing the Conversion Efficiency of Polyethylene to Methane through Codoping of Mn Atoms into Ru Centers and CeO2 Supports DOI Creative Commons
Meng Zhao, Xiang‐Ping Chu, Fei Wang

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 21, 2024

Chemical conversion has emerged as an effective approach for disposing waste plastics; however, the product diversity in traditional methods leads to pressing challenges separation and purification. As a pioneering advancement, comprehensive transformation of plastics into CH4 presents attractive prospect: directly yielding high-purity products. Significantly, is important hydrogen carrier industrial feedstock. However, there still much room enhancing overall efficiency. Herein, we show new strategy construct high-efficiency robust polyethylene (PE) upgrading catalyst by codoping Mn heteroatoms both RuO2 CeO2. We found that these effectively bolster stability Ruδ+ species under high-temperature reduction conditions. The harmonious coexistence Ru0 significantly refines reaction pathway adsorption alkane intermediates. Consequently, achieved impressive PE rate exceeding >99% with nearly 99% toward at moderate temperature 250 °C within 8 h. Our discovery not only opens window but also exciting opportunities in-depth complex, fine chemicals through methane-mediated catalysis.

Language: Английский

Catalytic Upcycling of Polyolefins DOI Creative Commons
Jia‐Kai Sun,

Jinhu Dong,

Lijun Gao

et al.

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

Citations

35
Highly selective upcycling of plastic mixture waste by microwave-assisted catalysis over Zn/b-ZnO DOI Creative Commons

Jun Zhao,

Bonan Liu, Lunqiao Xiong

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Feb. 18, 2025

7 billion of 9.2 tons plastic produced becomes waste while conventional catalytic recycling methods are vulnerable with degraded performance and intensive energy input. Here, a hybrid Zn/b-ZnO catalyst, together the specially-designed microwave reaction system, has achieved fast upgrading under atmospheric pressure without using H2. Bifunctional ZnO acts as absorber substrate in-situ formed Zn clusters promote C-C bond cleavage nearly 100% upcycle landfilled mixtures into lubricant base oil precursors monomers. Unprecedented turnover number (250 gplastic g−1catalyst) depolymerisation long-time stability over 50 successive cycles have been demonstrated, 8-time higher efficiency compared catalysis, indicating this strategy is an economical approach to efficient upcycling plastics towards valuable products. Moreover, catalyst can tolerate high contaminates, even still be converted precursors, which never reported before. Traditional for often suffer from reduced demands. authors demonstrate highly rapid process depolymerizing monomers microwave-assisted catalysis mild conditions.

Language: Английский

Citations

6
Upgrading polyolefin plastics: experiences from petroleum refining and distinct characteristics DOI
Rongxin Zhang, Guangchao Deng, Zhuoyang Jiang

et al.

Science China Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 19, 2025

Language: Английский

Citations

4
Catalytic chemical recycling and upcycling of polyolefin plastics DOI Creative Commons

Yingzi Tan,

Yidan Cheng, Jiaming Xu

et al.

Giant, Journal Year: 2024, Volume and Issue: 19, P. 100307 - 100307

Published: June 14, 2024

Polyolefins are the most produced and widely used polymeric materials. However, chemically inert nature of polyolefins has led to severe environmental pollution, posing a threat human sustenance development. Managing recycling polyolefin plastic waste is crucial for transition from linear sustainable circular economy. Catalytic chemical includes traditional techniques like pyrolysis photolysis, innovative methods that introduce cleavable bonds into chain closed-loop recycling. post-functionalization post-consumer materials another strategy tackle waste, aiming upgrade materials' utility contribute sustainability. Overall, developing catalytic deconstructing upcycling plastics essential encourage better reclamation practices reduce impact waste.

Language: Английский

Citations

10
Industrial and Laboratory Technologies for the Chemical Recycling of Plastic Waste DOI Creative Commons

Mason T. Chin,

Tianning Diao

ACS Catalysis, Journal Year: 2024, Volume and Issue: 14(16), P. 12437 - 12453

Published: Aug. 5, 2024

Synthetic polymers play an indispensable role in modern society, finding applications across various sectors ranging from packaging, textiles, and consumer products to construction, electronics, industrial machinery. Commodity plastics are cheap produce, widely available, versatile meet diverse application needs. As a result, millions of metric tons manufactured annually. However, current approaches for the chemical recycling postconsumer plastic waste, primarily based on pyrolysis, lag efficiency compared their production methods. In recent years, significant research has focused developing milder, economically viable methods commodity plastics, which involves converting waste back into monomers or transforming it other valuable chemicals. This Perspective examines both cutting-edge laboratory-scale contributing advancements field recycling.

Language: Английский

Citations

10
Co-recycling of plastics and other waste materials DOI

Mingyu Chu,

Wei-Lin Tu, Qiao Zhang

et al.

Published: April 28, 2025

Language: Английский

Citations

1
Recent advances in polyolefin plastic waste upcycling via mild heterogeneous catalysis route from catalyst development to process design DOI Creative Commons

Haokun Wang,

Shik Chi Edman Tsang

Cell Reports Physical Science, Journal Year: 2024, Volume and Issue: 5(7), P. 102075 - 102075

Published: July 1, 2024

Plastics, integral to modern life since their inception, pervade our daily existence. However, conventional approaches managing plastic waste, especially polyolefin pose significant challenges resources and the environment. Recent years have witnessed remarkable advancements in realm of waste management through traditional heterogeneous catalysis pathways, notably under mild conditions such as hydrocracking, hydrogenolysis, metathesis. In this comprehensive review, we offer a systematic overview spanning catalyst development process design engineering. We intricately compare various reaction routes, elucidate mechanisms, rigorously evaluate processes. Additionally, present insights into future directions for both academic research industrial recycling via routes at conditions.

Language: Английский

Citations

7
Unlocking opportunities: Supported metal catalysts for the chemical upcycling of waste plastics DOI

Mingyu Chu,

Qingyun Kang, Ping Hu

et al.

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 154375 - 154375

Published: July 28, 2024

Language: Английский

Citations

6
Recent Progress for Designing of Catalysts for Photothermal Conversion of Plastic Wastes DOI Open Access

Dongpo He,

Guangbing Huang,

Ziyao Zhou

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 11, 2024

Abstract In the context of global struggle against plastics, catalytic upgrading and recycling plastics has been subject considerable attention as a powerful strategy for achieving both environmental remediation value‐added chemical production. Compared with conventional methods, emerging photothermal catalysis methodology integrates photochemical thermal processes, which outstands features high conversion efficiency mild reaction conditions. Herein, comprehensive review recent research progress plastic waste is presented. First, types catalysts upcycling are classified into three categories, metallic materials, semiconductor carbon‐based based on mechanism. Their potential mechanisms converters future directions in highlighted. Furthermore, logical structural design materials summarized to enhance performance conversion. Finally, opportunities challenges this promising but nascent field discussed,

Language: Английский

Citations

5
Polyethylene hydrogenolysis by dilute RuPt alloy to achieve H2-pressure-independent low methane selectivity DOI Creative Commons
Qikun Hu,

Shuairen Qian,

Yuqi Wang

et al.

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

Published: Dec. 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.

Language: Английский

Citations

4