Title: Dehydrogenation of Cyclohexane with Alkaline-Earth Metal Modified V/K-γ-Al_2O_3 Catalyst
Abstract: M-3%V-6%K catalysts(M=Mg、 Ca、 Sr、 Ba) supported on γ-Al2O3 were prepared by impregnation,which were characterized using X-ray diffraction(XRD),N2 adsorption(BET),temperature-programmed reduction(H2-TPR),NH3-TPD and X-ray photoelectron spectroscopy(XPS).Their catalytic properties for the oxidative dehydrogenation of cyclohexane to cyclohexene were studied.Characterization data from H2-TPR and NH3-TPD demonstrated that addition of alkaline-earth affects the catalyst redox ability and acid character.The characterization results of XPS showed that the addition of the alkaline earth metal affects the composition of vanadium species and oxygen species in the catalyst.In addition,the relative concentration of K and V and the catalyst content of the surface lattice oxygen increased by the introduction of Ca and Ba.According to the results of activity evaluation,Ca-3%V-6%K/γ-Al2O3 and Ba-3%V-6%K/γ-Al2O3 showed better catalytic activity and high selectivity for cyclohexene(≥56%) under reaction temperature 425 ℃.Furthermore,these kinds of catalyst also showed the better catalytic stability and the regeneration of the catalyst.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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