Cyclohexylation of naphthalene over USY zeolites

The influence of thermal stabilization of NH4-Y zeolite and modification of USY zeolites with solutions of hydrochloric acid on the cyclohexylation of naphthalene in the liquid phase was studied. Removal of the part of extra- framework aluminium from zeolite structure has a positive effect on both co nversion of naphthalene and amount of dicyclohexylnaphthalenes formed. Modi fication of zeolites leads to an increase in conversion and selectivity of beta-substitution in the naphthalene cyclohexylation.