Preparation of Cerium-Manganese Composite Aerogel Supports and the Application in the Synthesis of Diphenyl Carbonate
Cerium-manganese composite silica aerogel carriers were prepared by in-situ synthesis and impregnation methods respectively.The samples were characterized by XRD,FT-IR,BET,TEM and EDS methods.The results showed that cerium-manganese oxide particles in silica aerogel carriers prepared by impregnation were in nano-size and those composite carriers remained intact pore.The catalytic performance for corresponding palladium-supported catalysts were investigated on the synthetic reaction of dipenyl carbonate by catalytic oxidation of phenol.The catalytic activity of Pd/20％ (Ce+Mn)-SiO2 under impregnation was much higher,over which the single pass yield of DPC reached 21.58％ with selectivity above 99.27％ under a totalpressure of 5 MPa at 75 ℃ for 6 h.
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