Abstract
This contribution describes with a few, properly selected, examples the spectroscopic characterisation of acid, base and redox centres in microporous and mesoporous molecular sieves. FTIR studies of the adsorption of molecular probes that lead to weak H-bonding (N 2 and CO), medium–strong H-bonding (H 2O) and proton-transfer reactions (NH 3) with the Brønsted acid hydroxyl groups of zeolites and aluminophosphates (HSAPO-34 and CoAPO-18) are illustrated. The acid Lewis sites (countercations) and the acid–base couples in NaX and NaY zeolites are monitored by CO and CO 2 adsorption respectively. Finally, FTIR and UV–Vis studies of the H 2O and NH 3 adsorption that probe the transition metal cation centres in mesoporous Ti–MCM41 and microporous CoAPO-18 catalysts are described.
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