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    Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2

    Access Status
    Fulltext not available
    Authors
    Syed-Hassan, Syed
    Li, Chun-Zhu
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Syed-Hassan, S. and Li, C. 2011. Effects of Crystallite Size on the Kinetics and Mechanism of NiO Reduction with H2. International Journal of Chemical Kinetics. 43: pp. 667-676.
    Source Title
    International Journal of Chemical Kinetics
    DOI
    10.1002/kin.20610
    ISSN
    0538-8066
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/18846
    Collection
    • Curtin Research Publications
    Abstract

    A kinetic investigation on the reduction of nanometer-sized nickel oxide particles (supported and unsupported) with hydrogen was carried out. The reduction behavior was found to be related to the average size of NiO crystallites. When the NiO crystallite size was less than about 20 nm, the dissociation of H2 was the key rate-limiting factor and remained unchanged almost throughout the reduction process. However, when the NiO crystallite size was >20 nm, its reduction kinetics changed with conversion, showing two kinetic compensation effects at lower and higher NiO conversion levels. It is believed that the movement and rearrangement of H atoms inside such bulk Ni/NiO solid could be an important aspect of the reduction kinetics, especially at higher (50%–90%) NiO conversion levels.

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