Catalytic pyrolysis of waste polyethylene into benzene, toluene, ethylbenzene and xylene (BTEX)-enriched oil with dielectric barrier discharge reactor

Song, Jiaxing; Wang, Jun; Pan, Yuhan; Du, Xudong; Sima, Jingyuan; Zhu, Chenxi; Lou, Fangfang; Huang, Qunxing

doi:10.1016/j.jenvman.2022.116096

Cited by 17 publications

(9 citation statements)

References 49 publications

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“…Depolymerization is the main way to generate monomer molecules; however, oligomers like dimers and trimers are formed via a backbiting process followed by β-scission . Song et al researched pyrolysis-DBD plasma-catalysis of polyethylene for the production of light aromatic compounds and claimed that the selectivity of monoaromatic compounds was improved as the plasma power was increased. Raising power increased the production of short-chain hydrocarbons and slowed down the monocyclic aromatic hydrocarbon condensation reaction during the polyethylene scission reaction .…”

Section: Resultsmentioning

confidence: 99%

“…Song et al researched pyrolysis-DBD plasma-catalysis of polyethylene for the production of light aromatic compounds and claimed that the selectivity of monoaromatic compounds was improved as the plasma power was increased. Raising power increased the production of short-chain hydrocarbons and slowed down the monocyclic aromatic hydrocarbon condensation reaction during the polyethylene scission reaction . Fan et al working on the pyrolysis of camphor wood sawdust catalyzed by HZSM-5 suggested that the use of nonthermal plasma technology enhanced the production of monocyclic aromatic hydrocarbons and decreased the amount of polycyclic aromatic hydrocarbons in the oil.…”

Section: Resultsmentioning

confidence: 99%

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Improving the Quality of Bio-oil Using the Interaction of Plastics and Biomass through Copyrolysis Coupled with Nonthermal Plasma Processing

Khatibi,

Nahil,

Williams

2023

Energy Fuels

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Bio-oil produced from the pyrolysis of biomass is chemically complex, viscous, highly acidic, and highly oxygenated. Copyrolysis of biomass and plastics can enhance oil quality by raising the H/C ratio, leading to improved biofuel properties. In this work, copyrolysis of polystyrene and biomass was passed to a second-stage dielectric barrier discharge nonthermal plasma reactor with the aim to further improve the product bio-oil. Pyrolysis of the polystyrene and biomass produces volatiles that pass to the second stage to undergo cracking and autohydrogenation reactions under nonthermal plasma conditions. There was a synergistic interaction between biomass and polystyrene in terms of overall oil and gas yield and composition even in the absence of the nonthermal plasma. However, the introduction of the nonthermal plasma produced a marked increase in monocyclic aromatic hydrocarbons (e.g., ethylbenzene), whereas polycyclic aromatic compounds decreased in concentration. Most notably, the influence of the plasma markedly reduced the quantity of oxygenated compounds in the product oil. It is suggested that the unique reactive environment produced by the plasma involving high-energy electrons, excited radicals, ions, and intermediates increases the interaction of the polystyrene and biomass pyrolysis volatiles. Increasing input plasma power from 50 to 70 W further enhanced the effects of the nonthermal plasma.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Improving the Quality of Bio-oil Using the Interaction of Plastics and Biomass through Copyrolysis Coupled with Nonthermal Plasma Processing

Khatibi,

Nahil,

Williams

2023

Energy Fuels

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“…However, the product distribution of depolymerization shows a strong temperature dependence ( 23 ). PE depolymerization over HZSM-5 zeolite tends to produce C 1 to C 5 gases (>50%) under temperature conditions of 450° to 650°C, resulting in low aromatic yields (<40%) ( 22 , 24 ). In addition, the aromatization of hydrogen-rich PE (i.e., effective H/C = 2.0) involves hydrogen transfer reactions and hydrogen evolution reactions (Fig.…”

Section: Introductionmentioning

confidence: 99%

Coupled conversion of polyethylene and carbon dioxide catalyzed by a zeolite–metal oxide system

Liu,

Ma,

Tian

et al. 2024

Sci. Adv.

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Zeolite-catalyzed polyethylene (PE) aromatization achieves reduction of the aromatic yield via hydrogenation and hydrogenolysis reactions. The hydrogen required for CO 2 hydrogenation can be provided by H radicals formed during aromatization. In this study, we efficiently convert PE and CO 2 into aromatics and CO using a zeolite–metal oxide catalyst (HZSM-5 + CuZnZrO x ) at 380°C and under hydrogen- and solvent-free reaction conditions. Hydrogen, derived from the aromatization of PE over HZSM-5, diffuses through the Brønsted acidic sites of the zeolite to the adjacent CuZnZrO x , where it is captured in situ by CO 2 to produce bicarbonate and further hydrogenated to CO. This favors aromatization while inhibiting hydrogenation and secondary hydrogenolysis reactions. An aromatic yield of 62.5 wt % is achieved, of which 60% consisted of benzene, toluene, and xylene (BTX). The conversion of CO 2 reaches values as high as 0.55 mmol g PE −1 . This aromatization–hydrogen capture pathway provides a feasible scheme for the comprehensive utilization of waste plastics and CO 2 .

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“…In the liquid products, the xylene and trimethylbenzene have a fraction of ~74.3%. Huang et al 34 reported the direct PE aromatization to toluene and xylene over Ga-loaded ZSM-5 at 500 ℃, the heavy aromatics appeared as major by-products. At 280 °C, PE was successfully converted to long-chain alkyl aromatics, but this process depends on the use of precious Pt nanoparticle catalysts.…”

Section: Introductionmentioning

confidence: 99%

Selective conversion of polyethylene wastes to methylated aromatics through cascade catalysis

Duan

Wang

et al. 2023

EES. Catal.

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Catalytic pyrolysis of waste polyethylene into benzene, toluene, ethylbenzene and xylene (BTEX)-enriched oil with dielectric barrier discharge reactor

Cited by 17 publications

References 49 publications

Improving the Quality of Bio-oil Using the Interaction of Plastics and Biomass through Copyrolysis Coupled with Nonthermal Plasma Processing

Improving the Quality of Bio-oil Using the Interaction of Plastics and Biomass through Copyrolysis Coupled with Nonthermal Plasma Processing

Coupled conversion of polyethylene and carbon dioxide catalyzed by a zeolite–metal oxide system

Selective conversion of polyethylene wastes to methylated aromatics through cascade catalysis

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