Alkylation of naphthalene with isopropanol over dealuminium USY catalysts

Highly active catalysts were prepared by dealuminumed USY with water vapour,ammonium nitrate aqueous solution and 12-tungstophosphoric acid(PW).The properties of the catalysts were identified by X-ray diffraction(XRD),N2 adsorption and desorption,pyridine infrared spectroscopy(Py-IR) techniques.The results showed that USY kept large relative crystallinity,high relative crystallinity and large L acid amount when dealuminum was appropriately completed.Using USY dealuminum treated with water vapour as the catalyst,conversion of naphthalene was 92.3%,selectivity of DIPN,β-IPN and β,β′-DIPN reached 45.9%,94.4%,and 85.3%. The suitable reaction conditions were as follows: calcination temperature was 550 ℃,reaction temperature was 160 ℃ and reaction balanced time was 150 min.After reacting 4 times,the conversion rate of naphthalene kept above 73% and selectivity of β,β′-DIPN preserved without obviously declined.