Preparation of vanadium-based perovskite by the effective method of microemulsion on enhanced surface area and activity: Environmental applications

چکیده مقاله

A series of perovskite-type oxides LaMnxV1-xO3±δ was prepared via microemulsion method using conductivity experiment and triangular diagrams for the first time. The prepared nanoparticles were utilized in methane catalytic combustion. In order to check the structure of nanoparticles, they were characterized by XRD, SEM, BET and H2-TPR techniques. The results showed that the activity and structure properties of the nanoparticles were markedly influenced by the vanadium substitution. The XRD analysis revealed the formation of cubic, monoclinic and rhombohedral structures. It is shown that environmental pollutants such as CO are not observed even under hypoxia conditions. Meanwhile, it was found that vanadium based samples showed high H2 consumption, while Mn substituted catalysts exhibited higher activity at lower temperatures. The LaMn0.9V0.1O3±δ exhibited the highest surface area (~15 m2/ g-1) and CH4 conversion (T50%= 545 °C). The mentioned behavior was attributed to the high redox potential and participation of lattice oxygen of vanadium and manganese. The catalytic stability was stable after 100 h on-stream.