Untersuchungen an oxidischen Katalysatoren. XXIV [1]. Adsorptions- und katalytische Eigenschaften von CeNaY- und CrNaY-Zeolithen

Studies on Oxide Catalysts. XXIV. Adsorption and Catalytic Properties of CeNaY and CrNaY Zeolites The adsorption of benzene, n-butylamine and ammonia(isotherms and heats of adsorption) on CeNaY and CrNaY zeolites of different exchange degrees has been measured. The acidic properties were characterized by titration with n-butylamine. As function of exchange degree the adsorption and catalytic properties (cracking of cumene) both change in the same manner. Whereas the reaction rate constants up to exchange degrees of 40–50% change only insignificantly, they are exponentially increasing at higher exchange degrees. The energies of activation are nearly independent of the degree and run to 23–25 kcal mol^?1.