Physico-chemical properties play an important role in activity and deactivation of catalysts. Three different zeolite catalysts (USY-zeolite, H-ZSMS and H-mordenite) were investigated at normal pressure under various experimental conditions with the disproportionation of ethylbenzene (EBD) as test reaction and nitrogen as inert gas. By means of the physical properties, IR-measurement and TPD-measurement, the experimental results could be explained sufficiently.