Abstract
Cyclohexane conversion to benzene over bimetallic Pt catalysts is an important prototypical reaction for fundamental studies of selective catalytic dehydrogenation catalysis. We have studied the adsorption and dehydrogenation of cyclohexane and benzene on Pt(111) and two ordered Sn/Pt(111) surface alloys using temperature-programmed desorption (TPD), Auger electron spectroscopy (AES), high-resolution electron energy loss spectroscopy (HREELS), and sticking coefficient measurements. Vapor-depositing Sn on the Pt(111) surface and annealing gives a (2×2) or (√3×√3)R30 o LEED pattern, producing well-defined surfaces identified as the (111) face of Pt 3 Sn and a substitutional alloy of composition Pt 2 Sn
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