Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions

    Access Status
    Fulltext not available
    Authors
    Mohd Shafie, Zainun
    Yu, Yun
    Wu, Hongwei
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Mohd Shafie, Z. and Yu, Y. and Wu, H. 2015. Effect of initial pH on hydrothermal decomposition of cellobiose under weakly acidic conditions. Fuel. 158: pp. 315-321.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2015.05.023
    ISSN
    0016-2361
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/19118
    Collection
    • Curtin Research Publications
    Abstract

    The paper reports the cellobiose hydrothermal decomposition at 200–250 °C under non-catalytic (with an initial pH close to 7) and weakly acidic conditions (with an initial pH of 4–6). It was found cellobiose decomposition under both non-catalytic and weakly acidic conditions follows similar primary decomposition pathways, i.e., isomerization and hydrolysis reactions being the main primary reactions. However, cellobiose decomposition under acidic conditions decreases the selectivities of isomerization reactions but increases the selectivity of hydrolysis reaction. While the rate constants of isomerization reactions under various pH conditions are found to be similar, that of hydrolysis reaction increases significantly with reducing the initial pH of the solution. Therefore, the acceleration of cellobiose decomposition under acidic conditions is mainly due to the increased contribution of hydrolysis reaction. Further analysis suggests that the rate constant of hydrolysis reaction is dependent on the hydrogen ion concentration of the solution at reaction temperature. A kinetic model was then developed, considering the isomerization and hydrolysis reactions. The model can well predict the cellobiose hydrothermal decomposition under various initial pH conditions at low temperatures (i.e., <225 °C). However, the model underestimates the rate constant of cellobiose hydrothermal decomposition at higher temperatures (i.e., 250 °C), suggesting the increased contribution of other reactions (e.g., reversion reactions) under the conditions.

    Related items

    Showing items related by title, author, creator and subject.

    • Insights into the Primary Decomposition Mechanism of Cellobiose under Hydrothermal Conditions
      Shafie, Z.M.; Yu, Yun; Wu, Hongwei (2014)
      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. ...
    • Cellobiose Decomposition in Hot-Compressed Water: Importance of Isomerization Reactions
      Yu, Yun; Shafie, Zainun; Wu, Hongwei (2013)
      This paper reports an investigation on the fundamental reaction mechanism of cellobiose decomposition in hotcompressed water (HCW) using a continuous reactor system at 225-275 °C. The importance of isomerization reactions ...
    • Hydrothermal Processing of Biomass and Its Derived Sugar Compounds in Hot-Compressed Gamma-Valerolactone/Water Mixtures
      Song, Bing (2018)
      This PhD thesis reports new knowledge on hydrothermal decomposition mechanisms of fructose, glucose, cellobiose, cellulose and lignocellulosic biomass in hot-compressed water/gamma-valerolactone (GVL) mixtures under ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.