The hydrogenation of naphthalene in hexane was carried out over the catalyst Pd-Pt supported on alumina mixed with different molecular sieves including ZSM-5, Beta, USY and SAPO-11. The catalyst was characterized by N-2 sorption, NH3-TPD, TPR, and H-2-O-2 titration. The results indicated that the catalyst performance for naphthalene hydrogenation is related to its acid property, pore structure, Pd-Pt dispersion, and metal-support interaction, which may be well regulated by mixing proper molecular sieves in the alumina support. The catalyst Pd-Pt supported on a two-component support of Al2O3-SAPO-11 is provided with proper acidity, large pores and moderate metal dispersion; it exhibits excellent performance in the saturated hydrogenation of naphthalene to decalin (over it a complete conversion of naphthalene is observed and the selectivity to decalin exceeds 90% at 260-300 degrees C). (C) 2010 Elsevier B.V. All rights reserved.