Abstract

Present study deals with pyrolysis kinetics of water hyacinth (Eichhornia crassipes) using thermogravimetric analysis (TGA). The temperature range for the TGA study was maintained at 30° to 900°C with the heating rates of 10°C/min at atmospheric pressure. High purity nitrogen with flow rate of 100 mL/min was used as the carrier gas to avoid oxygen contamination during thermal decomposition process. The TGA analysis reveals that decomposition intensity of water hyacinth was maximum (5.399 wt%/°C) at pyrolysis temperature 322°C. Arrhenius parameters viz activation energy and frequency factor was evaluated using Coats-Redfern method. The kinetic study reveals that maximum activation energy (Ea = 55.10 kJ/mol) was obtained in the conversion range (α) = 0.3-0.4 and the corresponding frequency factor is 7.44×10-2 s-1. Further, with the increase of degree of conversion, the activation energy and frequency factor decreases.

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