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    Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2

    Access Status
    Fulltext not available
    Authors
    Akhtar, M.
    Zhang, Shu
    Shao, X.
    Dang, H.
    Liu, Y.
    Li, T.
    Zhang, Lei
    Li, Chun-Zhu
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Akhtar, M. and Zhang, S. and Shao, X. and Dang, H. and Liu, Y. and Li, T. and Zhang, L. et al. 2018. Kinetic compensation effects in the chemical reaction-controlled regime and mass transfer-controlled regime during the gasification of biochar in O2. Fuel Processing Technology. 181: pp. 25-32.
    Source Title
    Fuel Processing Technology
    DOI
    10.1016/j.fuproc.2018.09.009
    ISSN
    0378-3820
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP180101788
    URI
    http://hdl.handle.net/20.500.11937/71508
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier B.V. This study aims to investigate the kinetic compensation effects during the char-O2reaction in a fluidised-bed reactor for two particle sizes of 0.80–1.0 mm and 2.0–3.35 mm. The rate of char-O2reaction was determined by analysing the gasification product gas composition in a quadrupole mass spectrometer. The char-O2reaction exhibited different kinetic compensation effects between apparent activation energy and apparent pre-exponential factor in the kinetics-controlled, diffusion-controlled and mixed regimes for both particle sizes. The same reaction mechanism is followed during the char-O2reaction in the kinetic regime at same or at different pyrolysis temperatures as revealed by the kinetic compensation effects. In the mixed regime, higher diffusion limitations increased the m and c values in the kinetic compensation effect lnAapp= mEapp+ c for any given particle size. Due to higher rates of reaction at higher char conversions, the char-O2reaction switched from kinetics-controlled to mixed regimes, resulting in higher slopes ‘m’ and y-intercepts ‘c’ in the kinetic compensation effects. The absence of isokinetic temperature at higher conversions indicates that char properties changed significantly at higher conversions compared with those at lower conversions.

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