ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 33, Number 2
JKCSEZ 33(2)
April 20, 1989 

Acidic properties of ZSM-5 zeolite catalysts were investigated by temperature-programmed desorption technique and ir spectroscopy. Ammonia t.p.d. pattern of HZSM-5 showed three different states, designated as α,β and γ. The amount of γ-state decreased with increasing SiO2/Al2O3 ratio, and upon cation-exchanging with alkali cations. From the ir adsorption spectra of absorbed pyridine and the reaction study of toluene alkylation, the γ-state could be explained to be due to the strong Bronsted acid sites of H-ZSM-5. Also they showed that the interaction between alkali cation-exchanged ZSM-5 and bases, i.e. NH3 and pyridine, was increasing with decreasing the size of cations.