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The support of catalyst for the direct synthesis of diphenyl carbonate(DPC)by heterogeneous catalytic reaction was prepared by the sol-gel method.Compared with activated charcoal,molecular sieve,porous ceramics, hopcalite,the support prepared by the sol-gel method has higher activity.The characterization of the support by X-ray diffraction(XRD)and transmission electron microscope(TEM)show that the main crystal phase is Co2MnO4 and the average particle diameter is about 40 nm.The optimum conditions for synthesis of the support were determined by orthogonal experiments,which indicate that the proportion of Cu,Mn,and Co is the first im- portant factor influencing the yield and selectivity of DPC.Temperature of calcination is the second one.The opti- mum conditions are:molar proportion of Cu,Mn,and Co being 1︰1︰1,temperature of calcination 700oC,drying at 100oC,temperature of water bath 85oC.The yield and selectivity of DPC in the process can reach 38%and 99%in the batch operation,respectively.The copper cobalt manganese mixed oxides chosen as the support contribute more to the high catalytic activity than the sol-gel method.
The support of catalyst for the direct synthesis of diphenyl carbonate (DPC) by heterogeneous catalytic reaction was prepared by the sol-gel method. Compared with activated charcoal, molecular sieve, porous ceramics, hopcalite, the support prepared by the sol-gel method has higher activity. Characterization of the support by X-ray diffraction (XRD) and transmission electron microscope (TEM) show that the main crystal phase is Co2MnO4 and the average particle diameter is about 40 nm. Optimal conditions for synthesis of the support were determined by orthogonal experiments, which indicate that the proportion of Cu, Mn, and Co is the first im- portant factor influencing the yield and selectivity of DPC. Temperature of calcination is the second one. optimum conditions are: molar proportion of Cu, Mn, and Co being 1: 1: 1, temperature of calcination 700oC, drying at 100oC, temperature of water bath 85oC. The yield and selectivity of DPC in the process can reach 38% and 99% in the batch operation, resp ectively.The copper cobalt manganese mixed oxides selected as the support contribute more to the high catalytic activity than the sol-gel method.