In the dehydrocyclization of n-octane over Pt-Sn/r-Al₂O₃, the bimetallic Pt-Sn catalyst prepared by simultaneous impregnation as a complex showed higher activity than the catalyst prepared by successive impregnation with SnCl₂ and H₂PtCl₆, and the suspended Pt-Sn catalyst showed more enhanced catalytic behaviors in C₈-aromatics formation than the normal one. The geometric factor was an important parameter for the positive effect on the catalytic activity in the n-octane conversion, while the electronic factor, the electron density of the metal, was that in the aromatization of n-hexane.