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Thermal behavior, synergistic effect and thermodynamic parameter evaluations of biomass/plastics co–pyrolysis in a concentrating photothermal TGA.

Authors :
Shagali, Abdulmajid Abdullahi
Hu, Song
Li, Hanjian
Chi, Huanying
Qing, Haoran
Xu, Jun
Jiang, Long
Wang, Yi
Su, Sheng
Xiang, Jun
Source :
Fuel. Jan2023:Part 1, Vol. 331, pN.PAG-N.PAG. 1p.
Publication Year :
2023

Abstract

[Display omitted] • Co-pyrolysis was performed in a photothermal TG system under high heating rates. • Activation energy relative difference was used to quantify the synergistic effect. • Thermo-kinetic properties were significantly affected by high heating rates. The heating rate would significantly impact the pyrolysis process, especially for the reactions containing synergistic effects between two different feedstocks. Co-pyrolysis of two widely available biomass (CC–corncob and PS–peanut shell) with plastic (PET–polyethylene terephthalate and PVC–polyvinyl chloride) was studied in a concentrating photothermal thermogravimetric analysis (CP-TGA) system at three heating rates (100, 500, 1000℃/min). The TG and DTG curves of CC and PS differ due to their polymeric components (holocellulose and lignin); two pronounced levels at 100 and 500 ℃/min heating rates were present in PVC. With increasing heating rate, the lateral shift towards higher temperature regions in the TG and DTG curves exceeded 100 °C. The synergistic effects on the blend samples were concentrated in the main decomposition region (250–580℃) due to rapid volatiles release, and the discrepancy values further stabilized at the final decomposition stages. The activation energy (Ea) was assessed using a comparative study of isoconversional methods, namely Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), and Starink. The isoconversional methods demonstrated that the co-pyrolysis process required about 30 % less activation energy than the pyrolysis of plastic (PET/PVC) alone. Coats-Redfern's (CR) model-fitting approach was used to identify the kinetic triplet of the devolatilization stage. The CR models revealed that biomass–PET blends belong to two to four-dimensional diffusion models, whereas biomass–PVC blends are dominated by chemical reactions of 1.5 and 2 orders. The energy barrier between activation energy (Ea) and change in enthalpy (ΔH) for all the blend samples was lower (∼5–6 kJmol−1), which slightly increased at higher heating rate. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00162361
Volume :
331
Database :
Academic Search Index
Journal :
Fuel
Publication Type :
Academic Journal
Accession number :
159569348
Full Text :
https://doi.org/10.1016/j.fuel.2022.125724