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    Fluoride removal from double four-membered ring (D4R) units in As-synthesized Ge-containing zeolites

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    Type
    Article
    Authors
    Liu, Xiaolong
    Ravon, Ugo
    Tuel, Alain
    KAUST Department
    KAUST Catalysis Center (KCC)
    KAUST Grant Number
    UK-C0017
    Date
    2011-11-22
    Permanent link to this record
    http://hdl.handle.net/10754/561927
    
    Metadata
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    Abstract
    Fluoride anions can be removed from the framework of as-prepared Ge-containing zeolites ITQ-13 and ITQ-17 without modification of the crystallinity and crystal habit. By contrast to all-silica ITQ-13 for which fluoride could not get out from D4R units, F is completely removed from Ge rich zeolites, even from D4R cages. This has been explained by the relaxing effect of germanium, making F less necessary for the stabilization of the small D4R units. Si/Ge ratios are similar in as-prepared and treated zeolites, indicating that the framework composition is not affected by the removal of anions. The fluoride-free zeolites possess XRD patterns similar to those of the as-made solids but their 29Si NMR spectra are significantly different, revealing the sensitivity of the method to the environment of silicon atoms in the framework. The extent of fluoride that can be removed from D4R units depends not only on the framework Ge content but also on the zeolite topology: for similar contents, F is much more easily eliminated from ITQ-17 than from ITQ-13. © 2011 American Chemical Society.
    Citation
    Liu, X., Ravon, U., & Tuel, A. (2011). Fluoride Removal from Double Four-Membered Ring (D4R) Units in As-Synthesized Ge-Containing Zeolites. Chemistry of Materials, 23(22), 5052–5057. doi:10.1021/cm2025735
    Sponsors
    This publication is based on work supported by Award UK-C0017, made by King Abdullah University of Science and Technology (KAUST). The authors thank Laurence Burel for SEM pictures.
    Publisher
    American Chemical Society (ACS)
    Journal
    Chemistry of Materials
    DOI
    10.1021/cm2025735
    ae974a485f413a2113503eed53cd6c53
    10.1021/cm2025735
    Scopus Count
    Collections
    Articles; KAUST Catalysis Center (KCC)

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