Direct Synthesis of Diphenyl Carbonate with Heterogeneous Catalyst and Optimal Synthesis Conditions of the Support Prepared by Sol-gel Method

Abstract

Abstract: 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 important factor influencing the yield and selectivity of DPC.Temperature of calcination is the second one.The optimum conditions are:molar proportion of Cu,Mn,and Co being 1:1:1,temperature of calcination 700℃,drying at 100℃,temperature of water bath 85℃.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.

Key words: diphenyl carbonate, heterogeneous catalyst, sol-gel method, optimum condition

摘要： 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 important factor influencing the yield and selectivity of DPC.Temperature of calcination is the second one.The optimum conditions are:molar proportion of Cu,Mn,and Co being 1:1:1,temperature of calcination 700℃,drying at 100℃,temperature of water bath 85℃.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.

关键词: diphenyl carbonate, heterogeneous catalyst, sol-gel method, optimum condition

GUO Hongxia, CHEN Hongping, LIANG Yinghua, RUI Yulan, LÜ Jingde, FU Zhanda. Direct Synthesis of Diphenyl Carbonate with Heterogeneous Catalyst and Optimal Synthesis Conditions of the Support Prepared by Sol-gel Method[J]. , 2008, 16(2): 223-227.

郭红霞, 陈红萍, 梁英华, 芮玉兰, 吕敬德, 付占达. Direct Synthesis of Diphenyl Carbonate with Heterogeneous Catalyst and Optimal Synthesis Conditions of the Support Prepared by Sol-gel Method[J]. , 2008, 16(2): 223-227.

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