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    Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity

    Access Status
    Fulltext not available
    Authors
    Hosokai, S.
    Kumabe, K.
    Ohshita, M.
    Norinaga, K.
    Li, Chun-Zhu
    Hayashi, J.
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Hosokai, S. and Kumabe, K. and Ohshita, M. and Norinaga, K. and Li, C. and Hayashi, J. 2008. Mechanism of decomposition of aromatics over charcoal and necessary condition for maintaining its activity. Fuel. 87 (13-14): pp. 2914-2922.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2008.04.019
    ISSN
    0016-2361
    URI
    http://hdl.handle.net/20.500.11937/26264
    Collection
    • Curtin Research Publications
    Abstract

    Decomposition of mono- to tetra-aromatics over charcoal was investigated under conditions such as temperature; 700–900 °C, inlet concentrations of aromatics, steam and H2; 7.5–15 g/Nm3, 0–15.5 vol% and 0–15.5 vol%, respectively, gas residence time within charcoal bed; 0.2 s, particle size of charcoal; 1.3–2.4 mm. The charcoal, with an initial surface area of 740 m2/g, was active enough to decompose naphthalene completely even at 750 °C. Aromatics with more rings per molecule were decomposed more rapidly. The aromatics were decomposed over the charcoal by coking rather than direct steam reforming irrespective of temperature and steam/H2 concentrations. The coking, i.e., carbon deposition from the aromatics, caused loss of micropores and thereby activity of the charcoal, while steam gasification of the charcoal/coke formed or regenerated micropores. Relationship between the overall rate of carbon deposition by the coking and gas formation by the gasification within the charcoal bed showed that progress of the gasification at a rate equivalent with or greater than that of the carbon deposition was necessary for maintaining the activity of the charcoal.

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