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    Determination of O-containing functional groups distribution in low-rank coals by chemical titration

    Access Status
    Fulltext not available
    Authors
    Zhou, J.
    Wang, Y.
    Huang, X.
    Zhang, Shu
    Lin, X.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhou, J. and Wang, Y. and Huang, X. and Zhang, S. and Lin, X. 2013. Determination of O-containing functional groups distribution in low-rank coals by chemical titration. Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology. 41 (2): pp. 134-138.
    Source Title
    Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology
    ISSN
    0253-2409
    School
    Fuels and Energy Technology Institute
    URI
    http://hdl.handle.net/20.500.11937/55429
    Collection
    • Curtin Research Publications
    Abstract

    Distribution of oxygen-functional groups (carboxyl, alcohol-hydroxyl, phenol-hydroxyl, methoxyl and carbonyl) in 4 Chinese low-rank coals was evaluated based on chemical analysis. Concentration of carboxyl was quantitated by acetic acid calcium ion exchange method and the buffer (pH=8.3). The effect of analysis condition on the concentration of carboxyl and total acidity was studied. The results show that the reliable results are obtained in N 2 atmosphere other than in air. The occurrence of carboxyl in coal is carboxylate. When quantitating the concentration of phenol-hydroxyl in the acid-washing brown coal with ion exchanged method, its concentration increases with increasing pH value. Concentration of carboxyl and hydroxyl account for 34.49% and 34.79%, respectively, in the total oxygen for the dry ash free basis brown coal. Different concentrations of carbonyl exist in the low-rank coals, but that of methoxyl is little.

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