Kinetic modeling of Dodonaea viscosa decomposition under microwave-assisted pyrolysis: A combined model-fitting and iso conversional approach

Authors

  • Safa W. Shakir Department of Chemical Engineering, College of Engineering, University of Tikrit, 34001, Iraq / Department of Chemical Engineering, College of Engineering, University of Baghdad, 10070, Iraq
  • Atheer M. Al-Yaqoobi Department of Chemical Engineering, College of Engineering, University of Baghdad, 10070, Iraq https://orcid.org/0000-0001-9458-2723

DOI:

https://doi.org/10.31699/IJCPE.2025.4.16

Keywords:

Microwave-assisted pyrolysis; Dodonaea viscosa; Thermogravimetric analysis (TGA); Kinetic modeling; Isoconversional methods; Activation energy

Abstract

   This work examines the kinetic behavior of Dodonaea viscosa during microwave-assisted pyrolysis as a means of addressing the limited insight regarding how biomass degradation pathways are affected by non-conventional heating. Thermogravimetric data were analyzed using both model-fitting (Coats–Redfern) and model-free (Friedman and Kissinger–Akahira–Sunose) methods to provide a thorough analysis. Results indicated that a third-order kinetic model appropriately described the general trend of decomposition; in contrast, iso-conversional analyses verified a multi-stage sequence with the activation energy declining during volatile yields and increasing at elevated conversion levels as a result of carbonaceous residue decomposition. These complementary understandings demonstrate that microwave-assisted heating ensures the development of characteristic reaction dynamics rather than those derived from traditional pyrolysis and thus supply mechanistic support for increased energy efficiency. The results not only unify methodology gaps between model-fitting and iso-conversional methodology but also provide useful direction for the optimization of microwave pyrolysis parameters, thus enhancing the sustainable production of lignocellulosic biomass-derived bioenergy.

Received on 27/09/2025

Received in Revised Form on 03/12/2025

Accepted on 03/12/2025

Published on 30/12/2025

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Published

2025-12-30

Issue

Vol. 26 No. 4 (2025): Iraqi Journal of Chemical and Petroleum Engineering

Section

Articles

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Copyright (c) 2025 The Author(s). Published by College of Engineering, University of Baghdad.

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This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Shakir, S. W., & Al-Yaqoobi, A. M. (2025). Kinetic modeling of Dodonaea viscosa decomposition under microwave-assisted pyrolysis: A combined model-fitting and iso conversional approach. Iraqi Journal of Chemical and Petroleum Engineering, 26(4), 193-205. https://doi.org/10.31699/IJCPE.2025.4.16