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    Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions

    Access Status
    Fulltext not available
    Authors
    Shafie, Z.M.
    Yu, Yun
    Wu, Hongwei
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Shafie, Z.M. and Yu, Y. and Wu, H. 2014. Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions. Industrial & Engineering Chemistry Research. 53: pp. 14607-14616.
    Source Title
    Industrial & Engineering Chemistry Research
    DOI
    10.1021/ie5027309
    ISSN
    0888-5885
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/28690
    Collection
    • Curtin Research Publications
    Abstract

    This paper reports a systematic investigation on the primary decomposition mechanism and kinetics of cellobiose under hydrothermal conditions at 200-275 °C and a wide initial concentration range of 10-10,000 mg L-1. Isomerization of cellobiose to cellobiulose (glucosyl-fructose) and glucosyl-mannose dominates the primary reactions of cellobiose decomposition, contributing to 71-93% of cellobiose decomposition depending on reaction conditions. In contrast, cellobiosehydrolysis to glucose makes only limited contributions (6-27% depending on reaction conditions) to the primary decomposition of cellobiose. This indicates that hydroxyl ions have a more significant effect to catalyze the isomerization reactions to produce cellobiulose and glucosyl-mannose. The catalytic effect of hydronium ions is weak probably because of the high affinity ofhydronium ions for water molecules, which reduces the availability of hydronium ions for catalyzing the hydrolysis reaction. At increased temperatures, the affinity of hydronium ions for water molecules decreases because of the weakened hydrogen bonds in water, leading to an increase in the selectivity of the acid-catalyzed hydrolysis reaction. A higher initial cellobiose concentrationalso promotes hydrolysis reaction due to the formation of acidic products at the early stage of cellobiose decomposition. As a result of the reduced molar ratio of ion product to cellobiose, the activation energies of both isomerization and hydrolysis reactions increase with an increase in initial concentration, leading to an increase in the apparent activation energy of cellobiosehydrothermal conversion.

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