The catalytic performance and characterization of a durable perovskite-type chloro-oxide SrFeO3-delta Cl sigma catalyst selective for the oxidative dehydrogenation of ethane

The catalytic performances and properties of SrFeO3-0.190 and SrFeO3-0.382C l0.443 catalysts have been investigated for the oxidative dehydrogenation o f ethane (ODE). XRD results showed that both catalysts exhibited oxygen-def icient perovskite-type structures. The inclusion of chloride ions in the Sr FeO3-delta lattice matrix can significantly enhance ethene selectivity and ethane conversion. The SrFeO3-0.382Cl0.443 catalyst showed an ethane conver sion of ca. 90%, an ethene selectivity of ca. 70%, and an ethene yield of c a. 63% under the reaction conditions: C2H6 : O-2 : N-2 = 2 : 1 :3.7, temper ature 680 degrees C, and space velocity 6000 ml h(-1) g(-1). With the incre ase of space velocity, ethane conversion decreased, whereas ethene selectiv ity increased over SrFeO3-0.382Cl0.443. Lifetime studies showed that the pe rovskite-type chloro-oxide catalyst was durable. The results of O-2-TPD and TPR experiments illustrated that the implanted chloride ions caused the ox ygen nature of SrFeO3-delta to change. By regulating the concentration of o xygen vacancies and the Fe4+/Fe ratio in this perovskite-type chloro-oxide catalyst, one can generate a durable chloro-oxide catalyst for the ODE reac tion with excellent performance.