A Study of the Reactivity of Surface-Adsorbed Oxygen Species with C2H6 on V2O5/SiO2

Abstract

Abstract The properties and reactivities of surface oxygen species including O− on V2O5/SiO2 were studied in connection with the oxidative dehydrogenation of C2H6 by N2O. O− was formed through N2O on reduced V2O5 supported on SiO2 which had been prepared from tetraethyl silicate, whereas it was not formed on V2O5 supported on SiO2 obtained from other sources. One mole of O− on V2O5/SiO2 was found to react with one mole of C2H6 at 298K. No oxygen species other than O− reacted with C2H6 at 298K. The surface reaction mechanism was discussed, and ethoxide was considered to be one of the surface intermediates. All the other surface oxygens but O− reacted with C2H6 above 573K. Since a catalytic oxidative dehydrogenation reaction of C2H6 was active above 573K, the surface oxygens other than O− were considered to be responsible for this reaction. The possibility of O− as the reaction intermediate was also discussed.