Ultraviolet excitation of Raman spectra of pyridines adsorbed on oxides

Abstract

The Raman spectra of pyridines adsorbed on silicas, silica–alumina and γ-alumina have been measured with an ultraviolet excitation (363.8 nm). The Raman intensities are considerably enhanced by the u.v. excitation for some adsorbed species. The Raman bands assigned to the species on Brönsted and Lewis acid sites have been observed even on silicas pretreated at 500°C.