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Pyrolysis Kinetics of Physical Components of Wood and Wood-Polymers Using Isoconversion Method

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  • Wenjia Jin

    ()
    (Division of Forestry and Natural Resources, West Virginia University, Morgantown, WV 26506, USA)

  • Kaushlendra Singh

    ()
    (Division of Forestry and Natural Resources, West Virginia University, Morgantown, WV 26506, USA)

  • John Zondlo

    ()
    (Chemical Engineering, West Virginia University, Morgantown, WV 26506, USA)

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    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.

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    Bibliographic Info

    Article provided by MDPI, Open Access Journal in its journal Agriculture.

    Volume (Year): 3 (2013)
    Issue (Month): 1 (January)
    Pages: 12-32

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    Handle: RePEc:gam:jagris:v:3:y:2013:i:1:p:12-32:d:22802

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    Related research

    Keywords: bioenergy; torrefaction; hardwood components; activation energy;

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    1. Singh, K.M. & Meena, M.S. & Kumar, Abhay & Singh, R.K.P., 2013. "Gender Issues in Agriculture," MPRA Paper 45401, University Library of Munich, Germany, revised 17 Jan 2013.
    2. Chen, Wei-Hsin & Kuo, Po-Chih, 2011. "Isothermal torrefaction kinetics of hemicellulose, cellulose, lignin and xylan using thermogravimetric analysis," Energy, Elsevier, Elsevier, vol. 36(11), pages 6451-6460.
    3. Slopiecka, Katarzyna & Bartocci, Pietro & Fantozzi, Francesco, 2012. "Thermogravimetric analysis and kinetic study of poplar wood pyrolysis," Applied Energy, Elsevier, Elsevier, vol. 97(C), pages 491-497.
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