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    Well-crystallized mesoporous samaria-doped ceria from EDTA-citrate complexing process with in situ created NiO as recyclable template

    Access Status
    Fulltext not available
    Authors
    Ran, R.
    Guo, Y.
    Zheng, Y.
    Wang, K.
    Shao, Zongping
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Ran, R. and Guo, Y. and Zheng, Y. and Wang, K. and Shao, Z. 2010. Well-crystallized mesoporous samaria-doped ceria from EDTA-citrate complexing process with in situ created NiO as recyclable template. Journal of Alloys and Compounds. 491 (1-2): pp. 271-277.
    Source Title
    Journal of Alloys and Compounds
    DOI
    10.1016/j.jallcom.2009.10.129
    ISSN
    0925-8388
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/36314
    Collection
    • Curtin Research Publications
    Abstract

    A facile EDTA-citrate complexing process with in situ created recyclable NiO as inorganic template was developed for the synthesis of mesoporous samaria-doped ceria (SDC) at high temperatures. By applying metal nitrates as the raw materials for the cation sources and EDTA and citric acid as the chelants, the molecular-level homogeneous mixing of the metal ions was successfully preserved to the solid precursor. Low-temperature calcination resulted in the formation of mixture oxides of nano-size SDC and NiO oxides, as demonstrated by XRD, FT-IR and BET analysis. A possible mechanism for the formation of mesoporous SDC was proposed, in which the SDC particles surrounded the nano-size NiO grains and sintered during the high-temperature calcination. Dissolving the coated NiO in SDC and self-aggregated NiO particulates from the mixture with diluted HNO3 resulted in a porous pure-phase SDC oxide. At optimal SDC to NiO ratios, mesoporous, thermally stable and well-crystallized SDC powder with narrow pore size distribution and high surface area was synthesized. © 2009 Elsevier B.V. All rights reserved.

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