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  • Synthesis and characterization of (h0l) oriented high-silica zeolite beta membrane

    Author(s)
    Chen, Yanli
    Zhu, Guangshan
    Peng, Ye
    Yao, Xiangdong
    Qiu, Shilun
    Griffith University Author(s)
    Yao, Xiangdong
    Zhu, Guangshan
    Year published
    2009
    Metadata
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    Abstract
    The (h0l) oriented high-silica zeolite beta membrane was prepared with improved method in fluoride media. Dealuminated zeolite beta nanocrystals used as seeds were preliminary deposited on support, and then the seeded supports were vertically placed in autoclaves for hydrothermal synthesis. After the secondary growth of seeded supports at 413 K for 2 days, zeolite membranes were characterized by X-ray diffraction and scanning electron microscopy to determine their morphology and preferred orientation. Zeolite beta membranes with a thickness of intergrown crystal layer around 2 mu m were prepared and the crystals with typical ...
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    The (h0l) oriented high-silica zeolite beta membrane was prepared with improved method in fluoride media. Dealuminated zeolite beta nanocrystals used as seeds were preliminary deposited on support, and then the seeded supports were vertically placed in autoclaves for hydrothermal synthesis. After the secondary growth of seeded supports at 413 K for 2 days, zeolite membranes were characterized by X-ray diffraction and scanning electron microscopy to determine their morphology and preferred orientation. Zeolite beta membranes with a thickness of intergrown crystal layer around 2 mu m were prepared and the crystals with typical truncated square bipyramidal morphology were packed tightly with their pyramidal (h0l) face perpendicular to the plane of membrane. in addition, ICP-AES chemical analysis was utilized to confirm the composition of seeds and membrane, and the Si/Al molar ratio of zeolite beta membrane was around 5000. The (001) and randomly orientated zeolite beta membranes were also prepared by changing the composition of starting synthesis gel and pH value. A competitive growth model was proposed to explain the formation of oriented membranes. The (h0l) oriented high-silica zeolite beta membrane with few cracks exhibited higher pervaporation flux. (C) 2009 Elsevier Inc. All rights reserved.
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    Journal Title
    Microporous and Mesoporous Materials
    Volume
    124
    Issue
    1-3
    DOI
    https://doi.org/10.1016/j.micromeso.2009.04.012
    Subject
    Chemical sciences
    Solid state chemistry
    Physical properties of materials
    Engineering
    Publication URI
    http://hdl.handle.net/10072/38341
    Collection
    • Journal articles

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