III International Conference

PP-II-72HYDROGENATION OF NAPHTHALENE ON SUPPORTED NOBLE METALSCATALYSTSMassenova A.T., Abilmagzhanov A.Z., Bekzhigitova K.A., Nazarbekova S.P.D.V. Sokolsky Institute of Organic Catalysis and Electrochemisrty MS&HE RK,Almaty, Republic of KazakhstanE-mail: almasenova@mail.ruThe hydrogenation of naphthalene has been studied on platinum metals supported onoxides and zeolites under hydrogen pressure 0.5-6.0 MPa and temperatures 220-320 o C. Theeffect of nature and acidity of support, hydrogen pressure, temperature, presence ofdibenzothiophene on conversion of naphthalene, yields of tetralin and decalin, activity,selectivity and stability of catalysts has been studied. Pt-Pd/Al 2 O 3 catalysts has beendeveloped and tested for diesel fuel with polyaromatics content 50-55 %. After the tests thecontents of polyaromatics compounds became 10 %.The hydrogenation of aromatic molecules of the diesel fraction is of interest both fromscientific and industrial point of view. A decrease in the aromatics content of diesel fuel(presented in diesel fuels by phenanthrene, naphthalene, tetralin) will result in an increase inthe number of cetane. It is well known that platinum metals catalysts have excellenthydrogenation properties at moderate pressures. But these catalysts are easily poisoned bysulfur-сontaining compounds in fuels (especially produced from high-sulfurous oils ofKazakhstan). However, it is also well known that complete sulfur removal is not possible. Inthis aspect it is very important to develop the highly effective, selective and stable againstsulfur containing compounds catalysts on the basis of platinum metals. To develop the noblemetal sulfur-resistant catalysts it has been proposed the addition of a second noble metal tothe catalyst, i.e. bimetallic catalysts, typically Pd–Pt, but also Re, Rh, etc.The catalysts on the basis of platinum metals were prepared by impregnation of supportswith solutions of different salts and organometallic compounds. Alumina, silica,aluminosilicate and several zeolites (ZSM-5, MCM-41 and Y) were used as supports. For thecatalysts characterization XRD, TEM, BET, TPD, XPS methods were used. Hydrogenationreaction has been studied at temperatures 220-320 o C and hydrogen pressure 0.5-6.0 MPa.Naphthalene was investigated for hydrogenation as model compound and diesel fuel asreal mixture of polyaromatic hydrocarbons. The products of hydrogenation of naphthalene are- tetralin and (cis- ans trans-) decalin and products of ring-opening process - alkylaromaticsand alkylcycloalkanes.296