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    A study of the chemistry of isomorphous substitution and characterisation of Al-ZSM-5 and Sc-ZSM-5 synthesised in fluoride media.

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    Authors
    Brigden, Clive T.
    Williams, Craig D.
    Apperley, David C.
    Issue Date
    2007
    
    Metadata
    Show full item record
    Other Titles
    Russian Journal of Inorganic Materials, 43(7): 758-769
    Abstract
    Al-ZSM-5 and Sc-ZSM-5 samples have been synthesized using fluoride media at around neutral pH. The synthesis chemistry has been studied and it is shown how the lower tendency of scandium to undergo increased fluoro-complexation (compared with aluminum) coupled with its tendency to hydrolyze is conductive to its isomorphous substitution and framework incorporation into the MFI zeolite structure. Clear unit cell volume expansion, elongation of the c crystallographic axis with increased scandium content, and a strong positive linear correlation between the unit cell volume expansion and the calculated unit cell framework scandium content are shown. Chemical shifts are assigned to tetrahedral and octahedral scandium from 45Sc MAS NMR analysis. Shoulders and a peak at lower wavenumber on the main internal T-O asymmetric stretches in the FT-IR spectra indicate that an interaction exists between framework-incorporated scandium and the SiO4 tetrahedra. It is concluded from the experimental evidence that isomorphous substitution of scandium into the zeolite framework has been achieved.
    Citation
    Inorganic Materials, 43(7): 758-769
    Publisher
    MAIK Nauka/Interperiodica distributed exclusively by SpringerLink
    Journal
    Inorganic Materials
    URI
    http://hdl.handle.net/2436/30333
    DOI
    10.1134/S0020168507070175
    Additional Links
    http://www.springerlink.com/content/2555058040620424/
    Type
    Journal article
    Language
    en
    ISSN
    00201685
    16083172
    ae974a485f413a2113503eed53cd6c53
    10.1134/S0020168507070175
    Scopus Count
    Collections
    Faculty of Science and Engineering

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