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Pyrolysis Kinetics of Physical Components of Wood and Wood-Polymers Using Isoconversion Method
Division of Forestry and Natural Resources, West Virginia University, Morgantown, WV 26506, USA
Chemical Engineering, West Virginia University, Morgantown, WV 26506, USA
* Author to whom correspondence should be addressed.
Received: 12 November 2012; in revised form: 29 December 2012 / Accepted: 5 January 2013 / Published: 14 January 2013
Abstract: 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 °C to 700 °C at the heating rates of 10, 30 and 50 °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 °C to 360 °C, 150 °C to 230 °C and 100 °C to 410 °C, respectively, with decomposition peaks occurring at 340 °C, 200 °C and 340 °C, respectively. In addition, the maximum activation energy for cellulose was 381 kJ/mol at 360 °C and for xylan it was 348 kJ/mol at 210 °C.
Keywords: bioenergy; torrefaction; hardwood components; activation energy
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Jin, W.; Singh, K.; Zondlo, J. Pyrolysis Kinetics of Physical Components of Wood and Wood-Polymers Using Isoconversion Method. Agriculture 2013, 3, 12-32.
Jin W, Singh K, Zondlo J. Pyrolysis Kinetics of Physical Components of Wood and Wood-Polymers Using Isoconversion Method. Agriculture. 2013; 3(1):12-32.
Jin, Wenjia; Singh, Kaushlendra; Zondlo, John. 2013. "Pyrolysis Kinetics of Physical Components of Wood and Wood-Polymers Using Isoconversion Method." Agriculture 3, no. 1: 12-32.