Abstract
Abstract The effect of potassium loading on the structural and catalytic properties of MoOx/ZrO2 catalysts for oxidative dehydrogenation of propane was investigated. Catalysts have been prepared by modified sol–gel method, and they were characterized by nitrogen physisorption, XRD, FT-Raman spectroscopy, XPS and temperature-programmed reduction (TPR). Catalytic activity measurements have been carried out between 400 and 530 °C under atmospheric pressure. It was observed that potassium addition prevented crystalline Zr(MoO4)2 formation, suppressing the interaction of molybdenum oxide and zirconia phases, and it also favored the formation of three-dimensional molybdenum oxide and two-dimensional polymolybdates. Both propylene selectivity and yield were enhanced with a certain amount of potassium addition.
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