Thermogravimetric Kinetic Analysis of the Pyrolysis of Rice Straw

A kinetic of the pyrolysis of rice straw is investigated with thermogravimetric analyzer with non-isothermal methods selected for analyzing solid-state kinetics data is presented. The weight loss was measured by TGA in nitrogen atmosphere. The samples were heated over a range of temperature from 298 K to 973 K with three different heating rates of 5, 10 and 15 K min(-1). The results obtained from thermal decomposition process indicate that there are two main stages such as active and passive pyrolysis. In the DTG thermograms the temperature peaks at maximum weight loss rate changed with increasing heating rate. The activation energy and pre-exponential factor obtained by Kissinger method are 172.62 kJ mol(-1), 1.456 x 10(11) min(-1), while, the same average parameters calculated from FWO and KAS methods are 192.66 kJ mol(-1), 1.287 x 10(22) min(-1) and 193.60 kJ mol(-1), 6.887 x 10(15) min(-1), respectively. Experimental results showed that values of kinetic parameters obtained from three different methods are in good agreement, but KAS and FWO methods are more efficient in the description of the degradation mechanism of solidstate reactions. (C) 2015 The Authors. Published by Elsevier Ltd.