Investigating acidity of metal fluoride surfaces by spectroscopic and chemical methods

Surface acidity in recently synthesised, high surface area aluminium and magnesium fluoride derivatives is discussed in terms of relative site strengths and site accessibilities. Recent investigations into the surface acidity of some aluminium and magnesium fluorides and their derivatives are review...

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Bibliographic Details
Published in:Journal of fluorine chemistry 2009-12, Vol.130 (12), p.1069-1079
Main Author: Winfield, John M.
Format: Article
Language:English
Subjects:
[ 36Cl] radiotracer
Aluminium(III) fluoride
Aluminum
Brønsted acidity
Catalysis
Chlorides
Derivatives
Fluorination
FTIR
Hydroxy fluoride
Labelling
Lewis acidity
Magnesium(II) fluoride
Metal fluorides
Specific surface
Spectroscopy
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Summary:Surface acidity in recently synthesised, high surface area aluminium and magnesium fluoride derivatives is discussed in terms of relative site strengths and site accessibilities. Recent investigations into the surface acidity of some aluminium and magnesium fluorides and their derivatives are reviewed with emphases on relative acidities and accessibilities of surface sites. The high specific surface areas of the materials are ideal for their study, either by FTIR spectroscopy using various probe molecules that have different basicity and steric requirements or by carrying out probe reactions that are catalysed by acidic surfaces. Context for some of the recent work is provided by a summary of the commercial catalyst, fluorinated chromia and the related, fluorinated aluminas; a particular emphasis in these sections is their catalysis of reactions that involve carbon–halogen species. For the high surface area metal fluorides and their derivatives, room temperature dehydrochlorination of tert-butyl chloride, employing chlorine-36 labelling to detect surface adsorbed species, enables comparative studies of surface acidity to be undertaken.
ISSN:0022-1139
1873-3328
DOI:10.1016/j.jfluchem.2009.07.012