Catalytic conversion of model compounds of plastic pyrolysis oil over ZSM-5

Dong, Son; Li, Houqian; Bloede, Iris K.; Abdulghani, Abdullah J. Al; Lebrón-Rodríguez, Edgard A.; Huber, George W.; Hermans, Ive

doi:10.1016/j.apcatb.2022.122219

Cited by 39 publications

(10 citation statements)

References 63 publications

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“…In addition, the impregnation approach resulted in the blockage of some of the micropores of the HZSM-5 zeolite (table S11). These results indicate that the decreased accessible active sites would reduce the aromatic yields ( 45 , 46 ). Therefore, the H species produced during the aromatization of PE on the zeolite must diffuse into the metal oxide active site with the proper acid-metal proximity, where it combines with CO 2 to produce CO. Metal oxides facilitated the removal of hydrogen species from zeolites rather than inducing the hydrogenation or hydrogenolysis of the aromatic precursor olefins.…”

Section: Resultsmentioning

confidence: 88%

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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Section: Resultsmentioning

confidence: 88%

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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“…While mechanical recycling has traditionally been utilized, it often leads to downcycling of plastics, compromising their mechanical properties 4 . Chemical recycling methods, particularly catalytic recycling, are increasingly recognized as promising alternatives [5][6][7] . Catalytic recycling enables the conversion of plastic waste into high-valueadded chemicals and fuels at lower temperatures (250-400 °C) compared to conventional chemical recycling methods (500-800 °C) 8 .…”

Section: Mainmentioning

confidence: 99%

Unraveling the Role of Water in Mechanism Changes for Economically Viable Catalytic Plastic Upcycling

Ro,

Kwon,

Ahn

et al. 2024

Preprint

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The surge in global plastic production, reaching to 390.7 million tons in 2021, exacerbates environmental pollution, with only 11% of plastic being recycled. Catalytic recycling, particularly through hydrogenolysis and hydrocracking, offers a promising avenue for upcycling polyolefin plastic, comprising 55% of global plastic waste. This study investigates the influence of water on polyolefin depolymerization using Ru catalysts, revealing a promotional effect only when both metal and acid sites, particularly Brønsted acid, are present. Findings highlight the impact of Ru content, metal-acid balance, and their proximity on this interaction, as well as their role in modulating the isomerization process, affecting product selectivity. Additionally, the interaction facilitates the suppression of coke formation, ultimately enhancing catalyst stability. A comprehensive techno-economic and life cycle assessment underscores the viability and environmental benefits of the process, particularly in the presence of water. These insights advance understanding and offer strategies for optimizing polyolefin plastic recycling processes.

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“…S20 and S21 and table S14). Many approaches have been developed to recycle or upcycle waste plastics into varied products, which include hydrogenolysis ( 37 , 38 ) and catalytic deconstruction (paraffins, olefins, and aromatics) ( 39 – 41 ), dissolution-based approaches (plastic resins with virgin properties) ( 42 ), functionalization (plastics with new properties) ( 43 ), and oxidation (oxygenates) ( 44 , 45 ). Compared with these routes, the key benefits of the approach reported are production of high-value (>$1600 per ton) monoaldehydes, dialdehydes, monoalcohols, and dialcohols ( 46 , 47 ), which can be done by using existing hydroformylation infrastructure.…”

Section: Technoeconomic Modeling and Life Cycle Assessmentmentioning

confidence: 99%

Hydroformylation of pyrolysis oils to aldehydes and alcohols from polyolefin waste

Jiang

et al. 2023

Science

Self Cite

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Waste plastics are an abundant feedstock for the production of renewable chemicals. Pyrolysis of waste plastics produces pyrolysis oils with high concentrations of olefins (>50 weight %). The traditional petrochemical industry uses several energy-intensive steps to produce olefins from fossil feedstocks such as naphtha, natural gas, and crude oil. In this work, we demonstrate that pyrolysis oil can be used to produce aldehydes through hydroformylation, taking advantage of the olefin functionality. These aldehydes can then be reduced to mono- and dialcohols, oxidized to mono- and dicarboxylic acids, or aminated to mono- and diamines by using homogeneous and heterogeneous catalysis. This route produces high-value oxygenated chemicals from low-value postconsumer recycled polyethylene. We project that the chemicals produced by this route could lower greenhouse gas emissions ~60% compared with their production through petroleum feedstocks.

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Catalytic conversion of model compounds of plastic pyrolysis oil over ZSM-5

Cited by 39 publications

References 63 publications

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

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

Unraveling the Role of Water in Mechanism Changes for Economically Viable Catalytic Plastic Upcycling

Hydroformylation of pyrolysis oils to aldehydes and alcohols from polyolefin waste

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