M. Muzayyin, S. Sukarni, R. Wulandari
The investigation of renewable energy sources is critical regarding the availability of energy in the future. This study was aimed to understand the potential of Cerbera manghas de-oiled seed by investigating the kinetic and thermodynamic parameters during the pyrolysis process. The de-oiled seed was obtained by the pressing of the seed at 33.81 N/m2 to release its oil content. The de-oiled seed sample was subjected to the thermogravimetric analyzer (Mettler Toledo TGA-DSC1) to knowing the characteristics of the sample during the time of thermal decomposition. The kinetic parameters were studied using the Coats-Redfern method. The results showed that the de-oiled seed decomposed into three stages; the first stage occurs at temperatures of 25-178 ºC, the second stage occurs at temperatures of 189-488 °C, and the third stage at temperatures of 500-900 °C, with the very low residue of 15.4 % was leftover at the final thermal processes. The kinetics analysis resulted in the activation energy, reaction order, and pre-exponential factor of 27.42 kJ/mol, 0.94, and 68,64 min-1, respectively. Following the kinetic results, then the thermodynamic parameters were analyzed and resulted in the values of ∆H (enthalpy), ∆G (Gibbs free energy), and ∆S (entropy) that were 22.40 kJ/mol, 171.86 kJ/mol, and -0.2230 kJ/mol, respectively. From the results of this study, it could conclude that the de-oiled seed of Cerbera manghas has potential as a renewable energy source. © 2020 American Institute of Physics Inc.. All rights reserved.
Master Program of Mechanical Engineering, Graduate School, Universitas Negeri Malang, Semarang Street 5, Malang, East Java, 65145, Indonesia; Department of Mechanical Engineering, Universitas Negeri Malang, Semarang Street 5, Malang, 65145, Indonesia; Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Semarang Street 5, Malang, 65145, Indonesia
