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Comparison of waste plastics pyrolysis under nitrogen and carbon dioxide atmospheres: a thermogravimetric and kinetic study


Md Saad, Juniza and Williams, Paul T. and Zhang, Ye Shui and Yao, Dingding and Yang, Haiping and Zhou, Hui (2021) Comparison of waste plastics pyrolysis under nitrogen and carbon dioxide atmospheres: a thermogravimetric and kinetic study. Journal of Analytical and Applied Pyrolysis, 156. art. no. 105135. pp. 1-10. ISSN 0165-2370; ESSN: 1873-250X


It is important to understand the influence of pyrolysis atmosphere on the thermal degradation of waste plastics. In this study, the decomposition of waste plastics; high and low density polyethylene, polypropylene, polystyrene, and polyethylene terephthalate were investigated from ambient temperature to 500 °C within nitrogen or carbon dioxide atmospheres. The thermal degradation characteristics and kinetic parameters of individual plastics and mixed plastics (household packaging, building construction and agricultural waste plastics) from three different waste treatment plants were investigated under N2, CO2 and N2/CO2 atmospheres. In all atmospheres, only one degradation peak temperature was observed between 250−510 °C. The replacement of N2 by CO2 showed different effects on the activation energy. Mixtures of N2/CO2 in the pyrolysis atmosphere resulted to lower activation energy for all plastic samples, with the exception of high density polyethylene, polystyrene and polyethylene terephthalate. The lower activation energy suggested that lower energy was required for the degradation process. However, a mixture of more than 30 % of CO2 may influence the degradation process of plastics due to a higher value of residue obtained after the experiment.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture and Food Sciences
DOI Number: https://doi.org/10.1016/j.jaap.2021.105135
Publisher: Elsevier
Keywords: Waste; Plastics; Thermogravimetric analysis; Carbon dioxide; Kinetic
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 26 Jan 2023 01:31
Last Modified: 26 Jan 2023 01:31
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.jaap.2021.105135
URI: http://psasir.upm.edu.my/id/eprint/96480
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