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Preparation and properties of highly fluorinated alumina prepared from boehmite aerogels or commercial γ-Al₂O₃

Content Provider	Royal Society of Chemistry (RSC)
Author	Skapin, Tomaž
Copyright Year	1995
Abstract	Pellets of alumina-based aerogels, doped with chromium or chromium and titanium, have been prepared according to a proposed preparation procedure from preformed and partly dried aqueous gels precipitated from metal chloride solutions. After supercritical drying, low density and high surface area (>300 m2 g–1) aerogel pellets were obtained, consisting of ca. 5 nm boehmite crystals. Fluorination of such aerogels with CHF3 resulted in high conversion to fluoride with the formation of mainly α-AIF3 and some β/γ-AIF3. Substantial crystal growth was observed with uniform pellet shrinkage and a large decrease in surface area. In contrast to fluorinated materials prepared from commercial γ-Al2O3 by fluorination with HF, fluorinated aerogels have a much more expanded and heterogeneous structure with a broad distribution of size/shape of particles and pores. Fluorinated aerogels show catalytic activity in trichloroethene hydrofluorination to CF3CH2Cl. By the fluorination of alumina-based aerogels, very porous, high surface area and catalytically active fluorides can be prepared. Such highly dispersed materials are believed to be very useful in studying heterogeneous catalytic reactions of technically important fluoro-derivatives of lower halogenated hydrocarbons.
Starting Page	1215
Ending Page	1222
Page Count	8
File Format	PDF
ISSN	09599428
Volume Number	5
Issue Number	8
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9950501215
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Chromium Titanium Chloride Supercritical drying Aerogel Boehmite Fluoride Hydrofluoric acid Trichloroethylene Haloalkane
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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