Valorization of Potato Peel Waste through Pyrolysis: Thermal decomposition, Kinetic, and Thermodynamic Analysis: Valorization of Potato Peel Waste through Pyrolysis: Thermal decomposition, Kinetic, and Thermodynamic Analysis

Tarique Ahmed Memon; Khalid Hussain Solangi; Faheem Ahmed Solangi; Zohaib Khan; Muhammad Ahmed

doi:10.30537/sjet.v8i2.1728

Authors

Dr. Tarique Ahmed Memon Department of Mechanical Engineering, The University of Larkano, Sindh, Pakistan
Khalid Hussain Solangi
Faheem Ahmed Solangi
Zohaib Khan
Muhammad Ahmed

DOI:

https://doi.org/10.30537/sjet.v8i2.1728

Keywords:

Biomass; pyrolysis; thermal degradation, kinetics, thermodynamics

Abstract

This study investigates the thermal degradation, kinetics and thermodynamics of potato peel (PP) pyrolysis. Thermogravimetric analysis was conducted from ambient temperature to 900 ºC under an inert atmosphere at heating rates of 10, 20, 30, 40, and 50 °C/min. The activation energy (E_a) was determined using four isoconversional methods: Friedman, FWO, KAS, and Starink. The pre-exponential factor (A) was derived using the Kissinger method, and thermodynamics parameters such as changes in enthalpy (ΔH), gibbs free energy (ΔG), and entropy (ΔS) were estimated using the kinetic data. Results indicate that peak temperature, and maximum decomposition rates and solid residues. The peak temperature, and maximum decomposition rates and solid residue, increased with heating rate. E_a values ranged from 114.40 to 452.42 kJ/mol (Friedman), 119.46 to 446.59 kJ/mol (FWO), 116.85 to 454.34 kJ/mol (KAS), and 117.10 to 454.55 kJ/mol (Starink). The KAS and Starink methods yielded nearly identical E_a values across all conversion levels. Initially, E_a remained relatively constant up to α =0.7, beyond which this it increased significantly. A values derived from the Friedman, FWO, KAS, and Starink methods ranged from 1.26×10⁷ to 1.09×10³⁷ s^-1, are 4.34×10⁷ to 3.44×10³⁷ s^-1, 1.87×10⁷ to 1.61×10³⁷ s^-1, and 1.99×10⁷ to 1.65×10³⁷ s^-1, respectively. A linear trend between E_a and lnA with a high regression coefficient was observed across all methods, indicating a strong kinetic compensation effect. Thermodynamic parameters such as ΔH, and ΔG showed positive values which indicate all reactions were endothermic and non-spontaneous nature. Moreover, ΔS values found negative at the starting of each reaction and were changed to positive at the end of conversion indicating the more ordered state at the starting followed by increase in entropy of the system due to further decomposition of biomass feedstock.

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Author Biography

Dr. Tarique Ahmed Memon, Department of Mechanical Engineering, The University of Larkano, Sindh, Pakistan

Lecturer, Department of Mechanical Engineering, The University of Larkano, Sindh, Pakistan

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