Effect of the preparation method and of the vanadium content on the physicochemical and surface properties of vanadium–magnesium-based catalysts for the selective oxidation of n-butane
作者： Samira Slyemi , Juliette Blanchard , Siham Barama , Akila Barama , Hassiba Messaoudi
DOI: 10.1016/J.CRCI.2017.08.002
关键词: Desorption 、 Catalysis 、 Inorganic chemistry 、 Specific surface area 、 X-ray photoelectron spectroscopy 、 Vanadium 、 Magnesium 、 Butane 、 Crystallite 、 Chemistry
摘要: Abstract Two series of V–Mg–O catalysts with vanadium contents 30 and 60 wt % were synthesized using sol–gel (SG) wet impregnation (IMP). The elaborated characterized by X-ray diffraction, Fourier transform infrared, fluorescence, Brunauer–Emmett–Teller, NH3–temperature-programmed desorption, transmission electron microscopy energy dispersive spectroscopy, photoelectron spectroscopy. preparation method the content strongly influenced textural, structural, surface properties, as well reactivity catalysts. increase in leads to formation V–Mg mixed phases, which decreased specific area. lowest crystallite size highest area obtained SG solids. morphology our is immensely affected procedure; so a smooth compared method. desorption analysis showed weak acid character catalytic surface, weakest was found series. spectroscopy revealed an enrichment magnesium presence three types oxygen species (O2−, O2−, O−). For both methods, performances evaluated selective oxidation n-butane are enhanced loading. higher activity selectivity butenes
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