Converting polyolefin plastics into few-walled carbon nanotubes via a tandem catalytic process: importance of gas composition and system configuration

Polyolefins such as polyethylene (PE) and polypropylene (PP) are abundant components of plastic waste. Chemical recycling of PE and PP via pyrolysis followed by chemical vapor deposition typically results in the growth of multi-walled carbon nanotubes (CNTs). Here, a tandem catalytic system for the...

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Main Authors: Veksha, Andrei, Chen, Wenqian, Liang, Lili, Lisak, Grzegorz
Other Authors: School of Civil and Environmental Engineering
Format: Journal Article
Language:English
Published: 2022
Subjects:
Online Access:https://hdl.handle.net/10356/161938
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author Veksha, Andrei
Chen, Wenqian
Liang, Lili
Lisak, Grzegorz
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Veksha, Andrei
Chen, Wenqian
Liang, Lili
Lisak, Grzegorz
author_sort Veksha, Andrei
collection NTU
description Polyolefins such as polyethylene (PE) and polypropylene (PP) are abundant components of plastic waste. Chemical recycling of PE and PP via pyrolysis followed by chemical vapor deposition typically results in the growth of multi-walled carbon nanotubes (CNTs). Here, a tandem catalytic system for the growth of few-walled CNTs is reported. The successful synthesis of few-walled CNTs in the system relies on the catalytic processing of pyrolysis gas from plastics into intermediate gas mixtures containing mainly paraffins and hydrogen (700 °C, catalyst: 40 wt% Co, 10 wt% Mo and 50 wt% MgO). Under appropriate conditions (1000 °C, catalyst: Co 3 wt%, Mo 2 wt% and MgO 95 wt%, synthesis time: 20 min), the obtained intermediate gas mixture was selectively converted into few-walled CNTs with > 95% CNTs having small outer diameters of 1-7 nm, containing CNTs with as little as three walls and having distinct radial breathing mode in Raman spectra at wave lengths 100-400 cm-1. The proposed synthesis process opens new opportunities for production of high value few-walled CNTs from plastic waste.
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spelling ntu-10356/1619382022-09-27T01:04:06Z Converting polyolefin plastics into few-walled carbon nanotubes via a tandem catalytic process: importance of gas composition and system configuration Veksha, Andrei Chen, Wenqian Liang, Lili Lisak, Grzegorz School of Civil and Environmental Engineering Interdisciplinary Graduate School (IGS) Nanyang Environment and Water Research Institute Residues and Resource Reclamation Centre Engineering::Environmental engineering Chemical Recycling Few-Walled Carbon Nanotubes Polyolefins such as polyethylene (PE) and polypropylene (PP) are abundant components of plastic waste. Chemical recycling of PE and PP via pyrolysis followed by chemical vapor deposition typically results in the growth of multi-walled carbon nanotubes (CNTs). Here, a tandem catalytic system for the growth of few-walled CNTs is reported. The successful synthesis of few-walled CNTs in the system relies on the catalytic processing of pyrolysis gas from plastics into intermediate gas mixtures containing mainly paraffins and hydrogen (700 °C, catalyst: 40 wt% Co, 10 wt% Mo and 50 wt% MgO). Under appropriate conditions (1000 °C, catalyst: Co 3 wt%, Mo 2 wt% and MgO 95 wt%, synthesis time: 20 min), the obtained intermediate gas mixture was selectively converted into few-walled CNTs with > 95% CNTs having small outer diameters of 1-7 nm, containing CNTs with as little as three walls and having distinct radial breathing mode in Raman spectra at wave lengths 100-400 cm-1. The proposed synthesis process opens new opportunities for production of high value few-walled CNTs from plastic waste. Economic Development Board (EDB) Nanyang Technological University The authors would like to acknowledge the Nanyang Environment and Water Research Institute, Nanyang Technological University (Singapore) and Economic Development Board (Singapore) for financial support of this research. 2022-09-27T01:04:06Z 2022-09-27T01:04:06Z 2022 Journal Article Veksha, A., Chen, W., Liang, L. & Lisak, G. (2022). Converting polyolefin plastics into few-walled carbon nanotubes via a tandem catalytic process: importance of gas composition and system configuration. Journal of Hazardous Materials, 435, 128949-. https://dx.doi.org/10.1016/j.jhazmat.2022.128949 0304-3894 https://hdl.handle.net/10356/161938 10.1016/j.jhazmat.2022.128949 35472542 2-s2.0-85129313307 435 128949 en Journal of Hazardous Materials © 2022 Elsevier B.V. All rights reserved.
spellingShingle Engineering::Environmental engineering
Chemical Recycling
Few-Walled Carbon Nanotubes
Veksha, Andrei
Chen, Wenqian
Liang, Lili
Lisak, Grzegorz
Converting polyolefin plastics into few-walled carbon nanotubes via a tandem catalytic process: importance of gas composition and system configuration
title Converting polyolefin plastics into few-walled carbon nanotubes via a tandem catalytic process: importance of gas composition and system configuration
title_full Converting polyolefin plastics into few-walled carbon nanotubes via a tandem catalytic process: importance of gas composition and system configuration
title_fullStr Converting polyolefin plastics into few-walled carbon nanotubes via a tandem catalytic process: importance of gas composition and system configuration
title_full_unstemmed Converting polyolefin plastics into few-walled carbon nanotubes via a tandem catalytic process: importance of gas composition and system configuration
title_short Converting polyolefin plastics into few-walled carbon nanotubes via a tandem catalytic process: importance of gas composition and system configuration
title_sort converting polyolefin plastics into few walled carbon nanotubes via a tandem catalytic process importance of gas composition and system configuration
topic Engineering::Environmental engineering
Chemical Recycling
Few-Walled Carbon Nanotubes
url https://hdl.handle.net/10356/161938
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