Probing the acid sites in confined spaces of microporous materials by vibrational spectroscopy

The use of IR spectroscopy for the evaluation of the Lewis and Bronsted acidity of microporous systems is illustrated having recourse to examples concerning zeolites, heteropolyacids and sulfonated membranes (NAFION). Methods based on the perturbation of the OH modes by interaction with basic probe...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2005-04, Vol.7 (8), p.1627-1642
Main Authors: ZECCHINA, Adriano, SPOTO, Giuseppe, BORDIGA, Silvia
Format: Article
Language:English
Subjects:
Acids - chemistry
Chemistry
Colloidal state and disperse state
Exact sciences and technology
Fluorocarbon Polymers - chemistry
General and physical chemistry
Ion-exchange
Membranes
Porous materials
Silicates - chemistry
Spectrophotometry, Infrared
Surface physical chemistry
Vibration
Zeolites - chemistry
Zeolites: preparations and properties
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Summary:The use of IR spectroscopy for the evaluation of the Lewis and Bronsted acidity of microporous systems is illustrated having recourse to examples concerning zeolites, heteropolyacids and sulfonated membranes (NAFION). Methods based on the perturbation of the OH modes by interaction with basic probe molecules are illustrated as well as on the perturbation of the internal modes of the probe itself. The use of H2 as probe is also debated by discussing new data specifically obtained for this review. The illustrated case examples are mainly obtained from the experience gained by the Turin group in 20 years.
ISSN:1463-9076
1463-9084
DOI:10.1039/b418763f