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    In situ structural changes of crystalline and amorphous cellulose during slow pyrolysis at low temperatures

    Access Status
    Fulltext not available
    Authors
    Leng, E.
    Zhang, Y.
    Peng, Y.
    Gong, X.
    Mao, M.
    Li, X.
    Yu, Yun
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Leng, E. and Zhang, Y. and Peng, Y. and Gong, X. and Mao, M. and Li, X. and Yu, Y. 2018. In situ structural changes of crystalline and amorphous cellulose during slow pyrolysis at low temperatures. Fuel. 216: pp. 313-321.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2017.11.083
    ISSN
    0016-2361
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/60337
    Collection
    • Curtin Research Publications
    Abstract

    This study reveals the evolution of functional groups during slow pyrolysis of crystalline and amorphous cellulose at low temperatures, using in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy combined with two-dimensional perturbation correlation infrared spectroscopy (2D-PCIS). During cellulose pyrolysis, although the inter-molecular hydrogen bonds are slightly stronger, both intra- and inter-molecular hydrogen bonds can break at low temperatures (i.e., > 120 °C), leading to the formation of free hydroxyl. Due to the weakened hydrogen bonds in cellulose, dehydration reactions firstly take place to produce saturated carbonyls, at a lower temperature (i.e., 240 °C) for amorphous cellulose. At increased temperatures (i.e., > 270 °C), the hydrogen bonds in cellulose reduce more significantly, promoting the decomposition of glucopyranose rings to form double bonds (i.e., carbonyls, carboxyls and conjugated alkenes). Compared to those for amorphous cellulose, the hydrogen bonds in crystalline cellulose are more stable, thus protecting the functional groups (i.e., –CH groups, glycosidic bonds and glucopyranose rings) from rapid disruption.

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