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