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    The synthesis and characterization of Al-Beta and all-silica Beta formed in fluoride and caustic media.

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    Authors
    Brigden, Clive T.
    Williams, Craig D.
    Issue Date
    2007
    
    Metadata
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    Abstract
    The influence of various parameters upon the synthesis of the BEA structure in fluoride and caustic media is investigated and results are compared and related to some previous studies in the literature. High crystalline, low faulted BEA structure has been made in an excess of fluoride (F−/SiO2 ratio of 1.5) across the entire gel Si/Al ratio range of 20 to ∞ using a fumed silica source and in the absence of seed crystals or stirring. Although, for gel Si/Al ratios >20, no aluminium was found in the products. The scope for further investigation of the effects of H2O content and stirring vs. non-stirring upon crystallinity and aluminium uptake, especially in conditions of lower fluoride concentration, is shown. Results from the caustic media syntheses agree with those from previous studies and it is found that the uptake of aluminium into the zeolite during synthesis is required for the formation of the BEA structure. Product characterization of Al-Beta confirms the framework incorporation of aluminium through increased d-spacings, the presence of tetrahedral coordinate aluminium and lowering of the FT-IR external asymmetric stretch and double bend vibration relative to an all-silica sample.
    Citation
    Microporous and Mesoporous Materials, 100(1-3): 118-127
    Publisher
    Amsterdam: Elsevier
    Journal
    Microporous and Mesoporous Materials
    URI
    http://hdl.handle.net/2436/30335
    DOI
    10.1016/j.micromeso.2006.10.017
    Additional Links
    http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TH4-4MFK0YC-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=df644739c9f8459e96c70bcc1f71e664
    Type
    Journal article
    Language
    en
    ISSN
    13871811
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.micromeso.2006.10.017
    Scopus Count
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    Faculty of Science and Engineering

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