Abstract
Publisher Summary This chapter discusses the characterization of acidic sites in HY zeolite, dealuminated or not, and Y zeolites exchanged with lanthanum (LaY), by the laser-induced fluorescence (LIF) method using an N-heteroaromatic base, quinoline, which is adsorbed on the surface and photoexcited at 240 nm. Spectra of quinoline reveal interactions between the adsorbate and surface sites. Unstructured broad bands with lifetimes less than 1 μsec are observed in all samples. Strong BrOnsted acid sites interact with quinoline to form the quinolinum ion, that ion being revealed by a band peaking at 390 nm. The acidity of LaY samples is a function of the La 3+ exchange rate and this was fast highlighted by LIF spectroscopy.
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