Effect of Reaction Conditions for n-Butane Dehydrogenation over Pt-Sn/θ-Al 2 O 3 Catalyst

Pt-Sn/θ-Al2O3 catalyst for n-butane dehydrogenation reaction was prepared by incipient wetness method. To confirm the physicochemical properties of Pt-Sn/θ-Al2O3 catalyst, the characterization was performed using X-ray diffraction (XRD), N2 sorption analysis, temperature programmed desorption of NH3 (NH3-TPD), temperature programmed reduction of H2 (H2-TPR) techniques. Also, the catalytic activities of Pt-Sn/θ-Al2O3 for n-butane dehydrogenation was tested as a function of pretreatment temperature, pretreatment time, reaction temperature, and the partial pressure of n-butane and hydrogen. The sum of selectivities to n-butenes consisting of 1-butene, cis-2-butene, and trans-2-butene was almost constant 95% in the range of conversion of n-butane 5-55%. The activation energy calculated from Arrhenius equation was 84 kJ mol -1 and the reaction orders of n-butane and hydrogen from Power's law were 0.70 and -0.20, respectively.