Insights on kinetic triplets and thermodynamic analysis of Delonix regia biomass pyrolysis

• Published in: Bioresource technology 2022-08, Vol.358, p.127375-127375, Article 127375
• Main Authors: Rammohan, D., Kishore, N., Uppaluri, R.V.S.
• Format: Article
• Language: English
• Subjects: Criado's plot; Delonix Regia; Kinetic triplets; TGA Analysis; Thermodynamics
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2022.127375

[Display omitted] •Kinetic triplets and thermodynamic properties of DR pyrolysis reported.•5 iso-conversional methods employed to investigate non-isothermal pyrolysis of DR.•Differential Friedman method yielded the lowest activation energy (202.34 kJ/mol).•Criado's technique demonstrated a multistep reaction mechanism during pyrolysis.•ΔH≈190 kJ/mol and ΔG≈203 kJ/mol show spontaneity and feasibility of DR pyrolysis. The aim of this work was to study the pyrolysis of Delonix regia biomass with non-isothermal thermogravimetric experiments. The targeted objective was to investigate kinetic triplets and thermodynamic parameters. Five iso-conversional methods, namely Differential Friedman, Kissinger-Akahira-Sunose, Ozawa-Flynn-Wall, Starink, and Distributed Activation Energy, have been considered. In the adopted heating rates of 5–55 °C min−1, the average activation energy and pre-exponential factor varied in the range 202.34–205.89 kJ mol−1 and 4.98 × 1017 – 2.04 × 1020 s−1 respectively. Corresponding average enthalpy and Gibbs free energy varied from 196.84 to 200.87 kJ mol−1 and from 182.64 to 206.41 kJ mol−1 respectively. Pyrolysis mechanism have been confirmed by Avrami-Erofeyev (A4), power-law (P2 and P4) and reaction (F1, F2, and ≥ F5) according to Criado's master plots.