ENERGY CONVERSION AND MANAGEMENT
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2024
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IF 9.9
Yang Zhang,Jun Zhao,Lei Zhang,Yong Chen,Wangjing Ma
The recycling and processing of plastic waste to promote resource sustainability has emerged as a global concern. Selectivily upcycling polyolefins into valuable monocyclic aromatic hydrocarbons (MAHs) is a promising strategy to promote a circular economy but limited by low yield and selectivity. In this study, one-step microwave-triggered tandem pyrolysis coupling ZSM-5 catalytic reforming technology was explored, which is efficient for selectively transforming plastic into benzene, toluene, ethylbenzene, and xylene (BTEX) riched oil products. Pyrolysis and catalytic processes were achieved by mixing plastic and ZSM-5 with graphite, respectively, and placing them in the bottom and top layers of the reactor. Results indicate the mass ratio of plastic or ZSM-5 to graphite and microwave irradiation power would influence the selectivity and yield of MAHs. After careful investigation, the optimum reaction conditions are deemed to be 600 W, and the mass ratio of LDPE and ZSM-5 to graphite is 3:1 and 1:1, respectively, and delightful selectivity and yield of MAHs of 82.06% and 28.12 wt% are obtained under the above conditions. More importantly, the BTEX accounted for a significant amount in the MAHs with the selectivity and yield of 70.53% and 24.17 wt%, demonstrating a strong ability to produce high-value BTEX, which is attributed to the ZSM-5 providing a sufficient active site for reforming the pyrolysis vapors and promote the formation of BTEX by cracking, aromatization and Diels-Alder reactions. Additionally, gas products are rich in C 2 H 4 , C 3 H 6 and C 4 H 8 olefin monomers accounting for around 60% of the gas products, which also manifest high value. Besides, the ZSM-5 can be stabilized by exceeding three successive cycles, and this strategy is also suitable for the catalytic upcycling of PP and mixed plastics to produce MAHs selectively. Therefore, this one-step microwave-triggered tandem pyrolysis coupling ZSM-5 catalytic reforming technology provides a potential waste resource utilization method to convert plastic waste into high-value petrochemical products.
研究领域:
化学工程
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环境科学
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材料科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2024
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IF 10.7
Ling-Xia Yun,Meng Qiao,Bin Zhang,Hang-Tian Zhang,Jie-Xin Wang
Utilizing plastic wastes as linker sources for metal–organic framework (MOF) synthesis is a green and sustainable methodology for the chemical upcycling of plastics. However, improving the depolymerization efficiency of polymers and avoiding highly corrosive solvents during the purification of the products remain significant challenges. Herein, we propose an approach to efficiently hydrolyze practical poly(ethylene terephthalate) (PET) wastes using aqueous dispersions of ultrasmall ZnO (6 nm) nanoparticles as the catalysts and subsequently synthesize five typical nano-MOFs by one-pot and two-pot strategies. The neutral hydrolysis of PET is greatly accelerated, with PET being completely depolymerized at 200 °C in 60 min with a terephthalic acid yield of 95.6%. The PET-derived MOF nanoparticles present high BET surface areas that are higher than or close to those of congeneric MOFs synthesized from petroleum-based and highly purified ligands. As a water absorbent, the two-pot MIL-101(Cr) exhibits high thermal stability with a water uptake capacity of 1327.3 mg g−1. For photocatalytic degradation of antibiotic pollutants, MIL-53(Al, Fe) samples derived from PET textiles show a high tetracycline removal efficiency of over 90% within 60 min without additives in an aqueous system, outperforming most of the conventionally prepared MOF catalysts. This approach disposes of discarded plastics in an eco-friendly way and produces value-added materials with excellent catalysis and adsorption properties.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
APPLIED ENERGY
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2024
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IF 10.1
Jiecheng Zou,Lanxun Zhao,Qiang Hu,Dingding Yao,Haiping Yang
The gasification technology has shown great potential to upcycle plastic waste for clean and high-value fuel. Gasification of disposable plastic masks was investigated in a two-stage pyrolysis-catalytic reforming system, aiming at producing the syngas with flexible H 2 to CO ratio which can be tuned for various downstream applications without further purification and adjustment. To maximize the syngas yield and minimize the carbon deposition, different gasifying agents in the staged catalytic process was explored. The results showed that CO 2 significantly promoted syngas production mainly by increasing CO yield. However, H 2 -rich syngas was obtained via using steam as the gasifying agent. Competitive and synergistic relationships between CO 2 and H 2 O agent at co-feeding process were further revealed. CO 2 facilitated the reforming of H 2 O at low dose of steam while exhibiting a main competition with adequate steam except for synergy at 5 mL/min CO 2 flow rate. An optimum H 2 -rich syngas yield of 135.59 mmol/g plastic with H 2 /CO ratio of 2 was obtained at co-feeding reactants. Therefore, the co-feeding of H 2 O and CO 2 could show positive effect for both coke removal and syngas quality regulation. Results found in this work increased the overall operational flexibility and economy of pyrolysis and catalytic reforming of plastic waste.
研究领域:
能源与环境科学
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化学工程
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产品关联
DOI
高影响因子
FUEL
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2022
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IF 8.035
K. Radhakrishnan,P. Senthil Kumar,Gayathri Rangasamy,L. Praveen Perumal,S. Sanaulla,S. Nilavendhan,V. Manivasagan,K. Saranya
Plastic production has increased globally, and many of these plastic items are no longer in use. The plastic wastes end up as garbage, disposed of in landfills, or scattered, posing major health and environmental risks. In terms of sustainability, converting plastic trash into fuels or any other better option, individual monomers, is a far more environmentally friendly waste management option than landfill dumping. Nearly 1.3 billion metric tonnes of plastic are produced annually as businesses strive to meet the demands of consumers. Plastic is made through a process called polymerization, in which hydrocarbons are rearranged into new molecules. These hydrocarbons often have a high molecular mass, and they may also contain other chemicals to boost their performance. Plastic is a useful material because, among other things, it is durable, lasts a long time, is inexpensive, and has many other benefits. Because plastic can take decades to degrade if left alone, effective waste plastic disposal should be a top priority for every-one. Yet, growing industrialization and urbanization have contributed to a discernible rise in fuel demand. Finding renewable energy sources to replace fossil fuels is now a critical global priority. Plastics-to-gasoline conversion provides a means to solve both of these problems. By applying intense heat (more than 370 °C) and an oxygen-free environment, pyrolysis thermochemically decomposes organic materials. The byproducts of pyrolysis are carbon black, hydrocarbons, and pyrolysis oil. This review focuses on pyrolysis as it is the most popular and efficient method for turning polymers into fuels in comparison with other methods. This review comprises the knowledge of different types of plastics and their properties. The major discussion was focused on pyrolysis methods for recycling plastics. To have better knowledge competitive recycling method were discussed. The optimization parameter for recycling process, by-products of plastics, advantages and disadvantages of pyrolysis process are discussed to identify the drawbacks and research gaps. The pyrolysis method are potential for addressing waste plastic management and highlights the need for a reliable alternative fuel source.
研究领域:
环境科学
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能源工程
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产品关联
DOI
高影响因子
Processes
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2022
·Vol. 10
·期 4
·782
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IF 3.352
Hui Wang,Bowen Zhang,Pan Luo,Kama Huang,Yanping Zhou
Here, FeAlOxcatalytic deconstruction of polyethylene in a domestic microwave oven is reported. With the starting weight ratio of FeAlOxto polyethylene at 1:1, the concentration and yield of H2reach up to 67.85 vol% and 48.1 mmol g−1plastic, respectively. CNTs@Fe3O4/Fe3C/Fe composite, which exhibits excellent microwave absorption properties, is generated simultaneously. The minimum reflection loss (RLmin) of the solid product reaches −54.78 dB at 15 GHz with an effective absorption bandwidth of 4.5 GHz at the thickness of 1.57 mm.Keywords:catalytic cracking;plastic waste;carbon nanotubes;hydrogen;microwave absorption
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2023
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IF 9.8
Peipei Gao,Zichao Hu,Yue Sheng,Weitong Pan,Lu Ding,Longfei Tang,Xueli Chen,Fuchen Wang
The release of chlorine during the pyrolysis of actual municipal plastic waste (MPW) was studied. Firstly, thermogravimetry-Fourier transform infrared (TG-FTIR) was analyzed to investigate the chlorine release behavior. Then, the effect of temperature on chlorine migrations was investigated by fast pyrolysis experiments in a fixed bed reactor. Results showed that chlorine released mainly between 241 and 353 °C in the form of HCl or chloroesters during MPW pyrolysis. After pyrolysis, chlorine was mainly distributed in the pyrolytic gas (74.34–82.89 %) and char (10.17–21.29 %). However, the release of chlorine was inhibited due to the melting behavior of MPW at <350 °C. Besides, the relative contents and types of organic chlorinated compounds in liquid products were both decreased with temperature. It was observed that polyethylene terephthalate (PET) was the greatest contributor to the formation of organic chlorinated compounds during MPW pyrolysis. Meanwhile, the pyrolysis of PET was significantly promoted by the HCl released from polyvinyl chloride (PVC). Subsequently, the pathways for the formation of organic chlorinated compounds through the co-pyrolysis of PVC and PET were proposed, including the initial degradation and subsequent chlorination of PET. These findings provided new insights into the release and regulation of chlorine-containing pollutants during actual MPW pyrolysis.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Ziwen Wang,Xingyu Huo,Jun Wang,Huanyu Chen,Qiuyu Wang,Bo Lv
The integration of photocatalytic processes to simultaneously convert plastic waste into valuable chemicals and generate green hydrogen represents a significant advancement in the field of renewable energy and environmental remediation. The study demonstrated the potential of solar-powered photocatalytic processes to convert plastic waste, specifically polylactic acid (PLA), into value-added chemicals like pyruvate while simultaneously producing green hydrogen. The use of a CZS/NiPS 3 heterojunction as a catalyst was pivotal, as it created an efficient interface for electron transfer, enhancing the overall photocatalytic activity. The CZS/NiPS 3 -20 % catalyst exhibited remarkable performance, producing 777.4 mmol/g of hydrogen over 10 h in a pretreated PLA solution. In a real PLA plastic system, the catalyst generated 506.41 mmol/g of hydrogen over the same period, showcasing its practical applicability. The catalyst facilitated the selective photoreforming of PLA into pyruvate, a high-value chemical, as confirmed by GC-MS analysis. This dual functionality-hydrogen production and chemical conversion-maximizes the utilization of photogenerated electrons and holes, improving the overall efficiency of the process. This research offers a strategy to address plastic pollution and boost the hydrogen economy by converting waste into valuable products and using seawater for clean energy.
研究领域:
环境科学
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能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
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IF 5.8
Wenpeng Hong,Yuhang Li,Haifeng Jiang,Yu Zhang,Wei Jia,Meng Song
Catalytic steam gasification is a promising route for converting plastic waste into valuable gaseous products. This work explores the heterogeneous catalytic gasification behavior of polystyrene (PS) in a two-stage fixed bed system, as well as the promotion mechanism for the generation of gaseous hydrocarbons. The obtained results indicate that adding MnCo 2 O 4 catalyst can effectively promote the formation of gaseous hydrocarbons. Further, the incorporation of Cu strengthens the above reaction process, resulting in a yield of 85.08 mmol/g for the C 1 -C 3 gaseous hydrocarbons. However, the doping of Ni has a negative effect on the generation of gaseous hydrocarbons. Moreover, an increase in the flow rate of steam within the system results in an initial rise followed by a decline in the yield of gaseous hydrocarbons. The optimal steam inflow is determined at 0.14 mL/min. The cycling test results of the catalyst show that the yield of the gaseous components of C 1 -C 3 can still be maintained at about 80 % of the initial state after five cycles. Finally, the synergistic pathway of steam and catalyst in PS gasification is elucidated. These works provide important and valuable guidance for the preparation of high-value gas-phase hydrocarbon products from waste plastics.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Peng Zhang,Cai Liang,Mudi Wu,Yongjie Li,Xiaoping Chen,Daoyin Liu,Jiliang Ma
The efficiency and sustainability for the recycling of plastic wastes into hydrogen was investigated. An integrated microwave-driven valorization of plastic wastes and CO 2 for H 2 and CO production was proposed. Specifically, plastic wastes were decomposed into H 2 and solid carbons, followed by carbon elimination via CO 2 gasification under microwave irradiation. Through the high-throughput screen of catalysts as well as the optimization of key parameters, over 96% hydrogen was converted into H 2 with a yield of 480 mmol∙g −1 H plastic while the carbon conversion and CO 2 conversion reached up to 70% and 53%. The five-cycle successive test displayed extraordinarily high and stable catalytic activity due to the facile elimination of carbon deposition. The application for real-world plastic wastes further demonstrated the efficient microwave-driven CO 2 gasification of plastic wastes into H 2 and CO production as a feasible and sustainable technology toward the waste-to-energy circular economy.
研究领域:
环境科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
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2024
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IF 6.7
Ziwen Wang,Qiuyu Wang,Zhe Yin,Man Zhang,Guoping Yu,Qingcheng Luo,Huanyu Chen,Binglin Tang,Kangzheng Li,Zhichao Zhang,Bo Lv
White plastic waste in the ocean not only destroys the Marine ecology, but also poses a potential threat to human health. In this study, we proposed a simple synthesis method by introducing suitable electron-bridge to design and synthesize CeO 2 -based II-type heterostructure catalysts with dual functions for efficient hydrogen production from seawater and photocatalytic conversion of plastics. The CeO 2 /CdS/NiS showed remarkable photocatalytic performance in the presence of plastic as the sacrificant. The hydrogen production rate of CeO 2 /CdS/NiS at the fifth hour was 32.40 mmol/g/h, which was 29 times that of bare CdS and 463 times that of bare CeO 2 . At the same time, the use of natural seawater to replace deionized water in this study was economically beneficial. Furthermore, we verified the feasibility of the selective oxidation of plastics into pyruvate, acetate and formate using CeO 2 /CdS/NiS photocatalyst and put forward a rational reaction mechanism. Overall, the study provids new possibilities for solving the problem of Marine plastic pollution and promoting the development of clean energy.
研究领域:
环境科学
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能源科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2023
·Vol. 11
·期 24
·12770-12776
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IF 11.9
Mengping Liu,Yu Xia,Wen Zhao,Ruiyi Jiang,Xin Fu,Brittney Zimmerle,Lihong Tian,Xiaobo Chen
Sunlight-driven CO2 reduction coupled with photo-oxidation of plastic waste into value-added chemicals is a very attractive approach towards solving the greenhouse and environmental crisis. Herein, Bi4V2O11 nanorods with regulable O-vacancy concentration have been synthesized by the solvothermal method, aiming to provide abundant active sites for CO2 adsorption and boost the separation of photogenerated carriers. In a dual-function system, gas production (CO) mainly from the CO2 reduction-half-reaction reaches 64.7 μmol g−1 h−1 on Bi4V2O11 with rich oxygen vacancies (VO-BVO-15) in PET hydrolysis solution under 300 W Xe lamp irradiation, 24.5-fold higher than that in 2 M KOH solution. Moreover, a considerable amount of HCOOH product with a conversion rate of 0.7 mmol gcata.−1 is also achieved under 5 h of irradiation. Glyoxal (6.9 mmol gcata.−1) and glyoxylate (3.2 mmol gcata.−1) are produced mainly from the PET oxidation-half-reaction. This work presents an in-depth study of the development of Bi–O–V photocatalysts through defect engineering for photocatalytic CO2 reduction and demonstrates a promising strategy for reuse of plastic waste and realizing carbon cycle with low energy consumption.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jun Zhao,Jianye Gao,Duanda Wang,Yong Chen,Lei Zhang,Wangjing Ma,Sui Zhao
The value-added utilization of plastic waste is a powerful way to effectively manage plastic waste and achieve a circular economy. However, high-performance catalysis often requires suitable substrate catalysts or complex processes, while low-energy consumption plastic upcycling technology is also urgently needed. In this study, various cheap and self-dispersing highly active iron-cobalt–nickel-monometallic and bimetallic functional catalysts were synthesized through a simple and fast one-step method for catalytic upcycling of plastic into hydrogen and carbon nanotubes . Results indicated that Ni 1 Fe 3 O x , Ni 1 Co 3 O x and Ni 3 Co 2 O x are the most efficient catalysts, realizing hydrogen yield as high as 60.2 mmol g-1 plastic, 63.2 mmol g-1 plastic, 63.5 mmol g-1 plastic and high selectivity of 79.4 vol%, 81.4 vol% and 83.7 vol%, respectively, for microwave-intensified catalytic dehydrogenation of LDPE, the hydrogen yield of which is almost 2–3 times that of traditional thermal catalysis. More importantly, a high hydrogen yield of 44.1 mmol g-1 plastic is also achieved when the feedstock is extended to the landfill mixed plastics waste. These results demonstrate that the synergies of self-dispersing bimetallic catalysts are promising for plastic waste upcycled via microwave-intensified catalysis.
研究领域:
化学工程
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）