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    NiO reduction with hydrogen and light hydrocarbons: Contrast between SiO2-supported and unsupported NiO nanoparticles

    Access Status
    Fulltext not available
    Authors
    Syed-Hassan, Syed
    Li, Chun-Zhu
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Syed-Hassan, S. and Li, C. 2011. NiO reduction with hydrogen and light hydrocarbons: Contrast between SiO2-supported and unsupported NiO nanoparticles. Applied Catalysis A: General. 398: pp. 187-194.
    Source Title
    Applied Catalysis A:General
    DOI
    10.1016/j.apcata.2011.03.033
    ISSN
    0926860X
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/21930
    Collection
    • Curtin Research Publications
    Abstract

    The reduction of solid metal oxide by hydrogen or hydrocarbon gases represents a class of reactions that are important to various technological applications. This study investigates the reduction of unsupported NiO nanoparticles and silica-supported NiO with different reducing gases (hydrogen, methane and ethane) in the temperature range of 500–600 °C. It was found that, in addition to the reaction and mass transfer of molecular species, the fates and activities of surface-formed radical species have to be considered in explaining the kinetics of nickel oxide reduction. It is believed that the desorption of hydrocarbon radicals from the particle surface has significantly slowed down the reduction of unsupported NiO nanoparticles. The ease with which a radical migrates from its generation site on a metallic island to the Ni–NiO surface boundary, on the other hand, is an important rate-determining factor in the reduction of silica-supported NiO.

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