Surface Characterization of Composite Catalysts Prepared by Sol-Gel Route

摘要

The aim of this work is to synthesize Nb-V oxide catalysts by sol gel route starting from metal alkoxides using different H_2O/V ratios.Dried samples are characterized by X-ray diffraction (XRD),atomic absorption,and Brunauer-Emmett-Teller (BET) analysis.Calcination of dried materials up to 600°C in flowing air has been followed with Thermogravimetry-Fouriertransform infrared spectroscopy (TG-FTIR) spectroscopic analysis.The catalytic properties of calcined materials are tested in the oxidative dehydrogenation of ethane at 600°C.An improvement of the catalytic performances of vanadium for the gel prepared with the higher H_2O/V ratio is found with respect to those of the supported catalyst due to the better interaction between vanadium and niobium.