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Investigating Kinetic and Thermodynamic Parameters in the Pyrolysis of Sheep Manure Using Thermogravimetric Analysis

Original scientific paper

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 12, Issue 3, September 2024, 1120493
DOI: https://doi.org/10.13044/j.sdewes.d12.0493
Ahmad Indra Siswantara1, Illa Rizianiza1,2 , Diyas Prawara Mahdi1, Tanwir Ahmad Farhan1, Candra Damis Widiawati3, Muhamad Hilman Gumelar Syafei1,4, Adi Syuriadi1,3
1 Universitas Indonesia, Depok, Indonesia
2 Institut Teknologi Kalimantan, Balikpapan, Indonesia
3 Politeknik Negeri Jakarta, Depok, Indonesia
4 Universitas Negeri Semarang, Semarang, Indonesia


The kinetics of the pyrolysis process of sheep manure were investigated using Thermogravimetric Analysis in this work. It was heated at 30°C to 900°C with a heating rate of 10°C/min. There are two stages of mass degradation, namely dehydration and devolatilization. The temperature dehydration stage is 30°C–140°C while the devolatilization stage is 210°C–900°C. However, at temperatures >500°C, mass degradation decreases until it reaches 900°C. This indicates that most of the volatile matter has disappeared at this temperature. The devolatilization stage includes the decomposition of hemicellulose and cellulose (210°C–900°C) and lignin (>590°C). The calculated activation energy from Friedman's non-conversional method is 21.32 kJ/mol and Coast-Redfern is 26,20 kJ/mol, while the frequency factor value is 9.94.1018 s-1 for Friedman and 3.42.1018 for Coast-Redfern Method which indicates that the pyrolysis process of sheep manure is a complicated phenomenon. The estimated activation energy value is then used to calculate thermodynamic properties e.g., Gibbs free energy, enthalpy, and entropy. 

Keywords: Pyrolysis; Sheep manure; Thermogravimetic; Kinetic; Friedman

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