In this paper, a high surface area nanocrystalline gamma alumina has been synthesized with the sol-gel method. The effects of different platinum loadings on the activity of Pt-based dehydrogenation catalyst were investigated. The prepared samples were characterized by X-ray diffraction (XRD), N 2 adsorption (BET), Transmission electron microscopy (TEM), Scanning electron microscopy (SEM), Inductive coupled plasma atomic emission spectroscopy (ICP-AES), Temperature programmed reduction (TPR) and

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... CO chemisorptions techniques. The catalytic results demonstrated very high selectivity relative to monoolefin formation at different reaction temperatures for all the samples prepared. The results revealed that the conversion did not increase by increasing the platinum loading. Comparing the catalytic results of sample DH-2 (0.2 wt% of Pt) with a commercial catalyst (0.4 wt% of Pt), it is noticed that the catalysts prepared with the synthesized nanocrystalline gamma alumina support performed well as an efficient catalyst for dehydrogenation of higher normal paraffins (C 10-C 15).