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Plastic pyrolysis over HZSM-5 zeolite and fluid catalytic cracking catalyst under ultra-fast heating
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Wong, Syie Luing, Armenise, Sabino , Nyakuma, Bemgba Bevan , Bogush, Anna, Towers, Sam, Lee, Chia Hau , Wong, Keng Yinn , Lee, Ting Hun , Rebrov, Evgeny V. and Muñoz, Marta (2023) Plastic pyrolysis over HZSM-5 zeolite and fluid catalytic cracking catalyst under ultra-fast heating. Journal of Analytical and Applied Pyrolysis, 169 . 105793. doi:10.1016/j.jaap.2022.105793 ISSN 0165-2370.
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WRAP-Plastic-pyrolysis-HZSM-5-zeolite-fluid-catalytic-cracking-catalyst-ultra-fast-heating-22.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (3271Kb) | Preview |
Official URL: https://doi.org/10.1016/j.jaap.2022.105793
Abstract
Plastic pollution compromises the environment and human well-being, and a global transition to a circular economy of plastics is vital to address this challenge. Pyrolysis is a key technology for the end-of-life recycling of plastics, although high energy consumption limits the economic feasibility of the process. Various research has shown that the application of induction heating in biomass pyrolysis reduces energy consumption when compared to conventional heating. Nevertheless, the potential of induction heating in plastic pyrolysis is rarely explored. This paper presents an exploratory study on the thermal and catalytic pyrolysis of high-density polyethylene, low-density polyethylene, and polypropylene in a fixed bed reactor through induction heating. An MFI-type HZSM-5 zeolite (SiO2/Al2O3 = 23) and an FAU-type spent fluid catalytic cracking (FCC) catalyst with distinctive Brønsted acidity and textural properties were used. A complete conversion of the plastic feedstocks was achieved within 10 minutes, even without a catalyst. Thermal pyrolysis produced wax (72.4-73.9 wt.%) and gas products, indicating a limited degree of polymer cracking. Catalytic pyrolysis over HZSM-5 and FCC catalyst significantly improved polymer cracking, leading to higher gas (up to 75.2 wt.%) and liquid product (up to 35.9 wt.%) yields at the expense of wax yield (up to 25.4 wt.%). In general, the gas products were rich in C3 and C4 compounds. The liquid product composition was highly dependent on the catalyst properties, for example, the HZSM-5 produced high aromatics, while the FCC catalyst produced high alkenes in the liquid products. The catalyst acidity and textural properties played an essential role in plastic pyrolysis within the short reaction time. This study demonstrated the feasibility of a fast, energy-efficient, and versatile plastic valorisation technology based on the application of induction heating, where the plastic feed can be converted into wax, gas, and liquid products depending on the end-use applications.
Item Type: | Journal Article | |||||||||
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Subjects: | H Social Sciences > HB Economic Theory Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
Library of Congress Subject Headings (LCSH): | Circular economy , Pyrolysis , Plastics , Zeolite catalysts, Induction heating, Biomass conversion | |||||||||
Journal or Publication Title: | Journal of Analytical and Applied Pyrolysis | |||||||||
Publisher: | Elsevier | |||||||||
ISSN: | 0165-2370 | |||||||||
Official Date: | January 2023 | |||||||||
Dates: |
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Volume: | 169 | |||||||||
Article Number: | 105793 | |||||||||
DOI: | 10.1016/j.jaap.2022.105793 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||
Date of first compliant deposit: | 21 November 2022 | |||||||||
Date of first compliant Open Access: | 17 November 2023 | |||||||||
RIOXX Funder/Project Grant: |
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