Kinetic Study of Bio-Oil Production from Pyrolysis of Rice Husk and Corncob Mixture Using Thermogravimetric Analysis
Keywords:
activation energy, bio-oil, corncob, pyrolysis, reaction kinetics, rice husk, thermogravimetric analysisAbstract
The efficient production of bio-oil from lignocellulosic biomass requires a deep understanding of pyrolysis kinetics, particularly during stages critical for bio-oil formation. This study investigates the pyrolytic behavior and kinetic parameters of a rice husk and corncob mixture (1:1 mass ratio), focusing on the decomposition phases that significantly influence bio-oil yield. Thermogravimetric analysis (TGA) was performed at heating rates of 10, 20, and 30 °C/min to analyze biomass decomposition process. Activation energy (Ea) was determined using the Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) isoconversional methods over a conversion range (α) of 0.1 to 0.6, corresponding to the primary degradation stage responsible for bio-oil production. The Coats-Redfern method was applied to identify the reaction mechanism in the α range of 0.2 to 0.6. Ea values calculated using the KAS and FWO methods ranged between 147 to 200 kJ/mol. The Diffusion 3D model, identified through the Coats-Redfern approach, showed Ea values consistent with those from the isoconversional methods. Cross-method validation and comparison with existing literature confirm the robustness of the kinetic parameters. These findings contribute to the design of sustainable energy production systems by providing updated kinetic insights for optimizing biomass pyrolysis processes at both laboratory and industrial scales.
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