The SiO2-supported Cu 3/2PMo 12O 40 catalyst was prepared by impregnating SiO2 with the solution of Cu 3/2PMo 12O 40. The catalyst was used for the transesterification of dimethyl carbonate and phenol to form diphenyl...The SiO2-supported Cu 3/2PMo 12O 40 catalyst was prepared by impregnating SiO2 with the solution of Cu 3/2PMo 12O 40. The catalyst was used for the transesterification of dimethyl carbonate and phenol to form diphenyl carbonate, and the effect of the Cu 3/2PMo 12O 40 loading and calcination temperature on the catalytic performance was investigated. The optimum Cu 3/2PMo 12O 40 loading was 26%, and the best calcination temperature was 400 ℃. Under the conditions of 175 ℃ and 8 h, the phenol conversion and the transesterification selectivity over 22%Cu 3/2PMo 12O 40/SiO2 calcined at 400 ℃ were 25% and 99.2%, respectively.展开更多
The transesterification of phenol and dimethyl carbonate (DMC) to diphenyl carbonate (DPC) was studied using tetrabutyl titanate and tetraphenyl titanate as catalysts. The main product was found to be methyl phenyl ca...The transesterification of phenol and dimethyl carbonate (DMC) to diphenyl carbonate (DPC) was studied using tetrabutyl titanate and tetraphenyl titanate as catalysts. The main product was found to be methyl phenyl carbonate (MPC) which is an intermediate of the reaction. The selectivity for DPC was improved when increasing the phenol/DMC molar ratio or prolonging the reaction time. The phenol conversion, selectivity for MPC and DPC were 47 4%, 90 9% and 9 14%, respectively, when the transesterification reaction approached equilibrium under the conditions of 175 ℃, 25 h and DMC∶phenol∶ Ti(OBu) 4 molar ratio of 1 5∶1∶0 05. The selectivity for DPC could reach 12.2% when the reaction time was 30 h. The tetrabutyl titanate catalyst showed a higher catalytic activity than tetraphenyl titanate.展开更多
文摘The SiO2-supported Cu 3/2PMo 12O 40 catalyst was prepared by impregnating SiO2 with the solution of Cu 3/2PMo 12O 40. The catalyst was used for the transesterification of dimethyl carbonate and phenol to form diphenyl carbonate, and the effect of the Cu 3/2PMo 12O 40 loading and calcination temperature on the catalytic performance was investigated. The optimum Cu 3/2PMo 12O 40 loading was 26%, and the best calcination temperature was 400 ℃. Under the conditions of 175 ℃ and 8 h, the phenol conversion and the transesterification selectivity over 22%Cu 3/2PMo 12O 40/SiO2 calcined at 400 ℃ were 25% and 99.2%, respectively.
文摘The transesterification of phenol and dimethyl carbonate (DMC) to diphenyl carbonate (DPC) was studied using tetrabutyl titanate and tetraphenyl titanate as catalysts. The main product was found to be methyl phenyl carbonate (MPC) which is an intermediate of the reaction. The selectivity for DPC was improved when increasing the phenol/DMC molar ratio or prolonging the reaction time. The phenol conversion, selectivity for MPC and DPC were 47 4%, 90 9% and 9 14%, respectively, when the transesterification reaction approached equilibrium under the conditions of 175 ℃, 25 h and DMC∶phenol∶ Ti(OBu) 4 molar ratio of 1 5∶1∶0 05. The selectivity for DPC could reach 12.2% when the reaction time was 30 h. The tetrabutyl titanate catalyst showed a higher catalytic activity than tetraphenyl titanate.
