Abstract
Amorphous vanadium-niobium mixed oxides with high surface area have been prepared by sol–gel route starting from metal alkoxides using different H 2O/V ratios. Dried samples have been characterized by XRD, atomic absorption and BET analysis. Calcination of dried materials up to 550 °C in flowing air has been followed with TG–FT-IR spectroscopic analysis. Redox properties of calcined samples have been investigated with TPR technique. Catalytic properties of calcined materials have been tested in the oxidative dehydrogenation of ethane at 550 °C and compared with those of a catalyst prepared by impregnation of Nb 2O 5 with V 2O 5 having the same composition of gel systems. An improvement of the catalytic performances of vanadium for the gel prepared with the higher H 2O/V ratio was found with respect to those of the supported catalyst due to the better interaction between vanadium and niobium.
Published Version
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