Oxidative dehydrogenation of ethane over Na2WO4-Mn/SiO2 catalyst using oxygen and carbon dioxide as oxidants

The performance of Na 2 WO 4 -Wn/SiO 2 catalyst for oxidative dehydrogenation of ethane was studied by using oxygen and carbon dioxide as oxidants. The >70% ethane conversion and selectivity to C 2 H 4 could be achieved at 700 °C, with the space velocity higher than 30000h -1 . The stability test of the catalyst for ODE showed that ethane conversion and selectivity remained constant during 100 h. CO 2 could be used as an oxidant instead of O 2 for oxidative dehydrogenation of ethane. 53.3% ethane conversion and 97% selectivity to ethylene could obtained at 800 °C. The selective decreased when temperature was higher than 800 °C. This is attributed to that the surface lattice oxygen is responsible for selective oxidative dehydrogenation of ethane, whereas the bulk lattice oxygen is responsible for deep oxidation of ethane.