Pyrolysis kinetics and activation thermodynamic parameters of exhausted coffee residue and coffee husk using thermogravimetric analysis

Exhausted coffee residue (ECR) and husk (CH) are potential feedstock for energy production through thermochemical biochemical conversion processes. Kinetic study of ECR CH is essential the design optimization different In this study, four iso-conversional methods were employed in estimation activation (EA) pre-exponential factor (A). The used includes Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS), Kissinger's method, Friedman method. Data from thermogravimetric/derivative thermogravimetric analysis (TGA/DTG) at varying heating rates 5-20°C/min an inert environment study. It was observed that rate influences pyrolysis parameters such as peak temperature, maximum degradation initial decomposition temperature. using FWO method range 62.3-102.4 kJ · mol−1. Likewise, KAS yielded between 51.3-93.3 mol−1 10.6-122.7 mol−1, respectively. addition, calculated FWO, KAS, shown to 39.1-140.6 27.7-131.6 24.9-111.2