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    Raman spectroscopic investigations into links between intrinsic reactivity and char chemical structure

    194323_100106_Pub_77526.pdf (257.3Kb)
    Access Status
    Open access
    Authors
    Wang, M.
    Roberts, D.
    Kochanek, M.
    Harris, D.
    Chang, L.
    Li, Chun-Zhu
    Date
    2013
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Wang, Meijun and Roberts, Daniel and Kochanek, Mark and Harris, David and Chang, Liping and Li, Chun-Zhu. 2013. Raman spectroscopic investigations into links between intrinsic reactivity and char chemical structure, in Carpenter, S. and Hower, J. (ed), 29th Annual International Pittsburgh Coal Conference, Oct 15-18 2012, pp. 705-718. Pittsburgh, PA: Curran Associates, Inc.
    Source Title
    Proceedings of the 29th Annual International Pittsburgh Coal Conference
    Source Conference
    29th Annual International Pittsburgh Coal Conference
    Additional URLs
    https://publications.csiro.au/rpr/download?pid=csiro:EP125491&dsid=DS1
    ISBN
    9781622767861
    Remarks

    This paper has been published in the proceedings of the 29th Annual International Pittsburgh Coal Conference, Pittsburgh, PA. October 15-18, 2012.

    URI
    http://hdl.handle.net/20.500.11937/32843
    Collection
    • Curtin Research Publications
    Abstract

    There are a large number of factors affecting the gasification reactivity of chars, including physical structure (e.g. surface area and pore structure), catalytically-active mineral matter, and chemical structure which includes the extent of crystallinity of the carbonaceous matrix and also the nature of the functional groups that comprise the char structure. This work focuses on the latter, using Raman spectroscopy to investigate the relationships between intrinsic reactivity and char chemical structure. An Australian bituminous coal char and a Chinese lignite char were characterised in terms of their intrinsic reactivities with CO2 and H2O (separately), under conditions where chemical processes control the observed reaction rates (Regime I). Unreacted and partially-reacted chars were characterised using Raman spectroscopy and gas adsorption for determination of chemical structure indicators and surface area respectively. Raman spectra suggested that the ratio of small to large aromatic rings decreased with increasing carbon conversion, and for the bituminous coal char, this seemed to be linked to the reactivity behaviour of chars made from the bituminous coal. The intrinsic reactivity of chars made from the lignite seemed to have a less significant correlation with Raman features, possibly due to the relative influence of catalytic activity of inorganic species.

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