Study on Direct Synthesis of Diphenyl Carbonate in Heterogeneous Catalysis II Effect of Lanthanum-content on Catalytic Activity

The composite metal oxides La x Pb y Mn z O as the carrier of Pd catalyst for direct synthesis of diphenyl carbonate in heterogeneous catalysis were prepared by sol\|gel method at calcining temperature 800 ℃. Effects of Lanthanum\|content on main crystal phase in carriers and particle size distribution of the carriers were investigated by XRD, SEM and TEM. The synthesis of DPC were carried out in high\|pressure reactor under different conditions. It was found that the catalysts prepared with 9.32% lanthanum \|content has good activity and selectivity.