The interaction of quinoline with the surface of Nafion-H and Nafion-H (13
wt%)/silica gel composites, silica gel itself, HY zeolite, dealuminated or
not, and two types of alumina is studied by laser-induced fluorescence. Str
ong Bronsted acid sites interact with quinoline to form the quinolinum, tha
t ion being revealed by a band peaking at 390 nm. When Lewis acid sites are
present, a complex formed between these sites and quinoline is observed. A
dimeric species and the diffusion of the adsorbates on the surface of the
Nafion-H polymer are discussed.