Journal of Energy, Mechanical, Material and Manufacturing Engineering
Vol. 10 No. 2 (2025)

Optimization of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) as an alternative biofuel

Ichwan Noor Ardiyat (Politeknik Negeri Banjarmasin)
Noor Rahman (Politeknik Negeri Banjarmasin)
Jarot Wijayanto (Politeknik Negeri Banjarmasin)
A'yan Sabitah (Politeknik Negeri Banjarmasin)
Ahmad Robittah (Politeknik Unggulan Kalimantan)



Article Info

Publish Date
31 Dec 2025

Abstract

This study aims to investigate the effect of torrefaction temperature on the physical and chemical properties of ironwood (Eusideroxylon zwageri) and to evaluate its potential as an alternative biofuel. Torrefaction was carried out at 200°C, 250°C, and 300°C for 150 minutes under oxygen-limited conditions, and the resulting char, tar, and gas yields were quantified, while chemical changes were analyzed using Fourier Transform Infrared Spectroscopy (FTIR). The results indicate that increasing temperature significantly affects product distribution, with the highest char yield (52%) obtained at 250°C and increased gas formation at 300°C. FTIR analysis revealed a progressive reduction of hydroxyl (O–H) and carbonyl (C=O) functional groups, indicating enhanced deoxygenation and carbonization at higher temperatures. These chemical transformations suggest improved thermal stability and fuel quality of the torrefied ironwood. It can be concluded that Eusideroxylon zwageri has strong potential as a renewable biofuel feedstock, with torrefaction at 250°C being the most suitable condition for solid biofuel production.

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Journal Info

Abbrev

JEMMME

Publisher

Subject

Mechanical Engineering

Description

Journal of Energy, Mechanical, Material and Manufacturing Engineering Scientific (JEMMME) is a scientific journal in the area of renewable energy, mechanical engineering, advanced material, dan manufacturing engineering. We are committing to invite academicians and scientiests for sharing ideas, ...