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    A SAXS study of the pore structure evolution in biochar during gasification in H2O, CO2 and H2O/CO2

    91594.pdf (1.373Mb)
    Access Status
    Open access
    Authors
    Liu, Y.
    Paskevicius, Mark
    Sofianos, M.V.
    Parkinson, G.
    Wang, Shuai
    Li, Chun-Zhu
    Date
    2021
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Liu, Y. and Paskevicius, M. and Sofianos, M.V. and Parkinson, G. and Wang, S. and Li, C.Z. 2021. A SAXS study of the pore structure evolution in biochar during gasification in H2O, CO2 and H2O/CO2. Fuel. 292: ARTN 120384.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2021.120384
    ISSN
    0016-2361
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Department of Chemical Engineering
    WASM: Minerals, Energy and Chemical Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP180101788
    http://purl.org/au-research/grants/arc/FT160100303
    http://purl.org/au-research/grants/arc/LE140100075
    URI
    http://hdl.handle.net/20.500.11937/91770
    Collection
    • Curtin Research Publications
    Abstract

    Gasification of biomass allows for its efficient utilisation as a renewable fuel through syngas production. This work presents the different effects of gasifying agents (H2O, CO2 and H2O/CO2) on the pore structure evolution in biochar during gasification. The effects of temperature (700, 800 and 900 °C) and biomass particle size (up to 5.6 mm) were also studied. The pore structure of biochar was characterized using synchrotron small angle X-ray scattering (SAXS). The pore development in biochar during gasification in H2O/CO2 was close to that in H2O. Carbon removal is more selective in CO2 than H2O and the derived biochar displayed pore fractal features, whereas the biochars gasified in H2O and H2O/CO2 exhibited a surface fractal network due to the less selective carbon removal in the presence of H2O. The pore structure development produced by various gasifying agents was paralleled by the evolution of the aromatic structures characterized by Raman spectroscopy. The different pore structure features result from the different reactivity of carbon sites with H2O and CO2, which can be attributed to the different amounts of O-containing groups in biochar, as well as the different reactivity of H2O and CO2. Increasing temperature reduced the differences in pore structure between biochars gasified in H2O and CO2. Biomass particle size had little impact on the pore structure of biochar.

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