Thermal analysis and non-isothermal thermogravimetric kinetics analysis using coats-redfern method of a torrefied empty fruit bunches

Mohamad Azri Sukiran and Peter Adeniyi Alaba and Abu Bakar Nasrin and Astimar Abdul Aziz and Loh, Soh Kheang (2023) Thermal analysis and non-isothermal thermogravimetric kinetics analysis using coats-redfern method of a torrefied empty fruit bunches. Journal of Oil Palm Research (Malaysia), 35 (4). pp. 639-652. ISSN 2811-4701

Thermal and mechanistic behaviours of solid biofuel are essential for commercial exploitation. In this work, the suitability of torrefied EFB as a solid biofuel was evaluated by investigating its physicochemical characteristics, kinetics and reaction mechanism during pyrolysis. The pyrolysis behaviour of raw and torrefied EFB was predicted via thermogravimetric analysis, kinetic parameters via Coats-Redfern three pseudo-components model-fitting method and pyrolysis mechanism via Criado method with Z-master plot. The physicochemical properties of torrefied EFB improved significantly compared to raw EFB in terms of fuel properties such as carbon content (8%-41%), fixed carbon (79%-328%) and calorific value (7%-42%). The degradation rate of hemicellulose and cellulose of torrefied EFB increased when the torrefaction temperature increased from 225°C to 300°C, leading to lower char yield and overall activation energy to initiate the pyrolysis process. The model deduced that higher overall activation energy was exhibited by raw EFB (9.39 kJ/mol) than those of torrefied EFB ranging from 6.55-7.86 kJ/mol (300°C-225°C). Thermal degradation of hemicellulose from torrefied EFB dominated the process by about 74% compared to cellulose and lignin when torrefaction temperature increased from 225°C to 300°C. Torrefaction could convert the power law mechanism to nucleation and growth mechanism gradually, allowing for better EFB thermal decomposition as a whole.

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Abstract

Thermal and mechanistic behaviours of solid biofuel are essential for commercial exploitation. In this work, the suitability of torrefied EFB as a solid biofuel was evaluated by investigating its physicochemical characteristics, kinetics and reaction mechanism during pyrolysis. The pyrolysis behaviour of raw and torrefied EFB was predicted via thermogravimetric analysis, kinetic parameters via Coats-Redfern three pseudo-components model-fitting method and pyrolysis mechanism via Criado method with Z-master plot. The physicochemical properties of torrefied EFB improved significantly compared to raw EFB in terms of fuel properties such as carbon content (8%-41%), fixed carbon (79%-328%) and calorific value (7%-42%). The degradation rate of hemicellulose and cellulose of torrefied EFB increased when the torrefaction temperature increased from 225°C to 300°C, leading to lower char yield and overall activation energy to initiate the pyrolysis process. The model deduced that higher overall activation energy was exhibited by raw EFB (9.39 kJ/mol) than those of torrefied EFB ranging from 6.55-7.86 kJ/mol (300°C-225°C). Thermal degradation of hemicellulose from torrefied EFB dominated the process by about 74% compared to cellulose and lignin when torrefaction temperature increased from 225°C to 300°C. Torrefaction could convert the power law mechanism to nucleation and growth mechanism gradually, allowing for better EFB thermal decomposition as a whole.

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Item Type:	Article
AGROVOC Term:	palm oils
AGROVOC Term:	biofuels
AGROVOC Term:	pyrolysis
AGROVOC Term:	thermogravimetric analysis
AGROVOC Term:	research
AGROVOC Term:	thermal degradation
AGROVOC Term:	fuel crops
AGROVOC Term:	energy sources
AGROVOC Term:	agricultural waste management
Geographical Term:	Malaysia
Uncontrolled Keywords:	activation energy, empty fruit bunches, kinetic reaction mechanism, pyrolysis, torrefaction
Depositing User:	Nor Hasnita Abdul Samat
Date Deposited:	29 Apr 2025 01:16
Last Modified:	29 Apr 2025 01:16
URI:	http://webagris.upm.edu.my/id/eprint/1779

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