XPS Study of Highly Selective ODE Catalysts of Y2O₃-LaF₃

Y₂O₃-LaF₃ catalysts,especially Y₂O₃-LaF₃（1:3 in molar） show very high ethylene selectivity for the oxidative dehydrogenation of ethane.The change of the binding energies of La3d_5/2 and Y3d_5/2 in Y₂O₃-LaF₃ series catalysts show that Y₂O₃ and LaF₃ might interact with each other.The formation of structure defects such as O^- and/or anionic vacancies as well as the isolation function of LaF₃ in Y₂O₃ might responsible for the high ethylene selecrivity.