Two different species of mordenites having various aluminum contents were prepared by treatment with hydrochloric acid and with wet-air, respectively. Adsorption isotherms of nitrogen at 78 ^oK, and benzene, cyclohexane, and n-hexane at various temperatures were measured on these solids.
Henry's constants, second virial coefficients of virial type adsorption equation and heat of adsorption extrapolated to zero coverage were obtained on these two series of solids. It leads to the conclusion that these constants vary with aluminum content in mordenite and may be used as parameters describing adsorption characteristics of mordenite having different aluminum content.