Acidity and basicity of zeolites: A fundamental approach

The main data concerning acidity and basicity characterization of protonic and cationic zeolites are described and discussed. In particular, experimental data concerning IR studies of the adsorption of pyridine, CO and CO2on Na-zeolites (Na-X, Na-A, Na-MOR) and on protonic zeolites (with emphasis on H-Y and USY) are described and discussed. The nature of the Lewis acid and basic sites as well as of the Brønsted acid sites is discussed with a fundamental chemical approach.