Abstract
This study aims at investigating pyrolysis kinetics of untreated and alkali-treated Crotalaria juncea (sunnhemp) fiber by widely used model fitting Coats-Redfern method using TGA data. A kinetics study of thermal decomposition has been done for both untreated and treated fiber with the help of TGA using a single heating rate of 10 °C/min. This analysis shows that treated sunnhemp fibers have variable activation energy based on the different models chosen. The estimated activation energy is in the range of 30.0–76.6 kJ mol−1 for the untreated sample & for the treated sample it is in the range of 34.58–67.12 kJ mol−1. Here the two phases have been selected as per temperature ranges in which inherent component decomposes during pyrolysis. In each phase, kinetics and thermodynamic parameters (ΔS, ΔH & ΔG) are also estimated. FTIR study of both samples confirms the concentration change of elements present in fiber due to the chemical treatment performed.
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