Thermogravimetric Analysis on The Pyrolysis

Abstract Two varieties of Philippine rice hulls, R-302 and R-19 were pyrolyzed at three heating rates of 10, 20 and 50 K/min using a dynamic thermogravimetric analyzer (TGA) in a nitrogen environment. Results show that the decomposition of hemicellulose starts at lower temperature than cellulose. Lignin decomposes at higher temperature than hemicellulose and cellulose. An abrupt weight loss can be noticed at second peak of active pyrolysis. As the heating rate is increased, there is a shift …

…is also true with the global mass loss kinetic model. For R-19, E and A values are as follows: 90.9 kJ/mol and 5.75E+05 for hemicellulose and cellulose decomposition; 49.61 kJ/mol and 2.32E+01 for lignin decomposition. Thus, the order of E for R-19 is in the order of: hemicellulose and cellulose> lignin. There is no appreciable final weight-loss between R-19 and R-302. As the heating rate was increased, decomposition tends to shift to a higher temperature.