In the study, the novel Pt/AlSBA-15-Al2O3 composite catalysts varying in hydrogenation and acidic functions were analysed. The catalysts containing 1.5 and 2.5 wt.% of platinum were prepared by impregnation of the mixture of AlSBA-15 and boehmite (20 wt.%) powders with H2PtCl6 solution, which was followed by extrudation. Physicochemical properties of the catalysts were determined by N-2 sorption, XRD, XRF, Py-IR, H-2-O-2 titration, TEM and TOF-SIMS. Activity results performed under atmospheric pressure (240-350 degrees C, H-2:CH = 50 Nm(3)m(-3), W/F = 0.8 gs cm(-3)) revealed that the activity of 1.5%Pt/AlSBA-15-Al2O3 composite catalyst was much higher than that of 1.5%Pt/AlSBA-15 and 1.5%Pt/Al2O3 catalysts, due to the occurrence of a synergic effect between their components. It was found that an increase from 1.5 to 2.5 wt.% in platinum amount in the Pt/AlSBA-15-Al2O3 composite catalyst only slightly influences the 1-methylnaphthalene conversion (5.0 MPa, 240-380 degrees C, H-2: CH = 500 Nm(3) m(-3), WHSV = 2 h(-1)) but increases the selectivity to methyldecalins by 20% (at 350 degrees C). Yield of the desired ring opening products over 2.5%Pt/AlSBA-15-Al2O3 was low and did not exceed 6 wt.% at 380 degrees C. (C) 2015 Elsevier B.V. All rights reserved.