Abstract
Thermogravimetric analysis of three lignocellulosic biomass such as Miscanthus grass, Castor stem, and Jatropha stem under high purity nitrogen atmosphere were carried out over a temperature range of 25 °C–900 °C at three different heating rates of 10, 15, 20 °C min−1. The profiles generated from thermal decomposition process signified that except dehydration there were three main stages of degradation occurred associated with three main components (hemicellulose, cellulose, lignin). The temperature peaks at maximum weight loss rate obtained from Differential thermogravimetric thermograms changed with increasing heating rate. The activation energy and pre-exponential factor were calculated by applying two model-free methods and compared. The kinetic parameters obtained from Kissinger and Ozawa methods were in good agreement with the experimental results. The value of kinetic parameters explained the thermal stability of the biomass. The thermal analysis could not infer the composition and chemical structure of lignocellulosic biomass; hence FTIR spectroscopic analysis has been carried out.
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