Aluminium(III) fluoride originating from decomposition of hydrazinium fluoroaluminate(III) under oxidative conditions: Syntheses, X-ray photoelectron spectroscopy and some catalytic reactions

Sven Schroeder, Tomaž Skapin, Zoran Mazej, Anna Makarowicz, Adolf Jesih, Mahmood Nickkho-Amiry, Sven L M Schroeder, Norbert Weiher, Boris Žemva, John M. Winfield

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Decomposition of hydrazinium pentafluoroaluminate under oxidative (F 2) conditions leads to aluminium(III) fluoride whose properties are highly dependent on the conditions used for synthesis. In the presence of anhydrous HF, which probably acts as a heat exchange agent, samples have high BET areas, whereas BET areas of samples prepared under gas-solid conditions are small. XPS data are consistent with the presence of Lewis acid centres but, more importantly, emphasise the importance of surface hydroxyl groups, particularly in high surface area compounds. Catalytic behaviour towards isomerisation of 1,1,2-trichlorotrifluoroethane and subsequent dismutations at moderate temperatures and towards room temperature dehydrochlorination of tert-butyl chloride has been demonstrated for some high BET samples; both reactions indicate that surface Lewis sites exist. Catalytic ability is inhibited by surface hydroxyl groups but is improved by prior fluorination of the surface with CCl2F2. Catalysis is inhibited also by the presence of ammonium fluoroaluminate, a by-product of the decomposition process. The [NH4]+ salt level can be reduced by washing with anhydrous HF. © 2011 Elsevier B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)703-712
    Number of pages9
    JournalJournal of Fluorine Chemistry
    Volume132
    Issue number10
    DOIs
    Publication statusPublished - Oct 2011

    Keywords

    • [ 36Cl]-radiotracer
    • Aluminium fluoride
    • Catalysis
    • Oxidative decomposition
    • XPS

    Fingerprint

    Dive into the research topics of 'Aluminium(III) fluoride originating from decomposition of hydrazinium fluoroaluminate(III) under oxidative conditions: Syntheses, X-ray photoelectron spectroscopy and some catalytic reactions'. Together they form a unique fingerprint.

    Cite this