Pyrolysis Kinetics of Physical Components of Wood and Wood-Polymers Using Isoconversion Method
Two hardwood species, namely red oak and yellow-poplar, were separated into their bark, sapwood and heartwood components. The samples were tested for calorific value, specific gravity, proximate analysis, mineral composition, chemical composition, ultimate analysis, and thermo-chemical decomposition behavior. In addition, the thermo-chemical decomposition behaviors of cellulose, xylan, and lignin polymers were also tested. Thermo-chemical decomposition behavior was assessed using a thermo-gravimetric (TGA) system by heating the sample from 50 Â°C to 700 Â°C at the heating rates of 10, 30 and 50 Â°C/min under nitrogen. The activation energy was calculated for various fractional conversion values using the isoconversion method. The results showed that char yields of lignin, cellulose and xylan were 41.43%, 4.45% and 1.89%, respectively, at the end of pyrolysis. Furthermore, cellulose, xylan and lignin decomposed dramatically in the temperature range of 320 Â°C to 360 Â°C, 150 Â°C to 230 Â°C and 100 Â°C to 410 Â°C, respectively, with decomposition peaks occurring at 340 Â°C, 200 Â°C and 340 Â°C, respectively. In addition, the maximum activation energy for cellulose was 381 kJ/mol at 360 Â°C and for xylan it was 348 kJ/mol at 210 Â°C.
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