Structure and properties of noncrystalline aluminum oxide-hydroxide fluorides

Christoph Stosiek, Gudrun Scholz, Sven L M Schroeder, Erhard Kemnitz

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The thermal treatment of sol-gel derived aluminum hydroxide fluorides leads to new, X-ray amorphous, macroporous aluminum oxide-hydroxide fluorides. Followed by EA, DTA-TG, XPS, FT-IR, NH3-TPD, BET, XRD, and MAS NMR, it can be shown that the simplified composition of these compounds is "AlFO" and "AlF2O1/2", respectively. These aluminum oxide-hydroxide fluorides exhibit a large number of acid centers. The local structure consists of AlFxOcn-x units (cn, coordination numbers 6, 5, 4), and all sites are partially fluorinated. It can be shown that bridged and terminal F-sites are related to 5- and 6-fold coordinated Al sites. © 2010 American Chemical Society.
    Original languageEnglish
    Pages (from-to)2347-2356
    Number of pages9
    JournalChemistry of Materials
    Volume22
    Issue number7
    DOIs
    Publication statusPublished - 13 Apr 2010

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