Synthesis of Diphenyl Carbonate over the Magnetic Catalysts Pd/La1-xPbxMnO3 (x=0.2-0.7)

The magnetic perovskite-supported palladium catalysts Pd/La_1-xPb_xMnO₃ (x=0.2-0.7) were prepared and used for the oxidative carbonylation of phenol to diphenyl carbonate. The synthesized catalysts were characterized by the X-ray diffraction (XRD), surface area measurement BET, vibration sample magnetometer (VSM) and temperature-programmed reduction (TPR). The experimental results demonstrated that the magnetic Pd/La_1-xPb_xMnO₃ (x=0.4-0.5) obtain relative better catalytic activity. It can be explained by higher concentration of oxygen vacancies, larger amount and better mobility of lattice oxygen of their support. Furthermore, these samples possess sufficient saturated magnetization. Thus, Pd/La_1-xPb_xMnO₃ (x=0.4-0.5) may be suitable for operation in the magnetically stabilized bed reactor.