The Ti-supported lead dioxide electrode（Ti/PdO2） consisted of a Sb2O3/SnO2 semiconductive interlayer and electrodeposited PbO2 films was prepared. The optimum ratio of Sb2O3 to SnO2 was 15%25%. Addition of NaF（0.40...The Ti-supported lead dioxide electrode（Ti/PdO2） consisted of a Sb2O3/SnO2 semiconductive interlayer and electrodeposited PbO2 films was prepared. The optimum ratio of Sb2O3 to SnO2 was 15%25%. Addition of NaF（0.40 g/L） in electroplating solution could decrease the rate of PbO2 deposition, which resulted in the formation of small crystal particles and compact PbO2 films. XRD study showed the β-form crystal of electrode. The electrode was tested in synthesis of 4-picoline acid by electro-oxidation of 4-picoline, showing good electroconductivity and stable life.展开更多
In this paper, a new “green” route to the synthesis of adipic acid is reported. This environmentally benign synthesis of adipic acid involves in the direct oxidation of cyclohexene catalyzed by Na2WO4·2H2O with...In this paper, a new “green” route to the synthesis of adipic acid is reported. This environmentally benign synthesis of adipic acid involves in the direct oxidation of cyclohexene catalyzed by Na2WO4·2H2O with 27 5% aqueous hydrogen peroxide using alkyl ammonium sulfate as a phase transfer agent. The results show that N,N-dimethyl-dodecylammonium sulfate, dodecylammonium sulfate and tri-n-octylammonium sulfate can be used as efficient phase transfer agents for this reaction under refluxing temperature. After the reaction is stopped, the homogeneous solution was cooled to 0 ℃ for 12 h. Then the crystalline product was collected by filtration and dried in air, a colorless, analytically pure product adipic acid was obtained in 52.1%—94.1% yields. The catalyst in concentrated filtrate can be reused.展开更多
文摘The Ti-supported lead dioxide electrode（Ti/PdO2） consisted of a Sb2O3/SnO2 semiconductive interlayer and electrodeposited PbO2 films was prepared. The optimum ratio of Sb2O3 to SnO2 was 15%25%. Addition of NaF（0.40 g/L） in electroplating solution could decrease the rate of PbO2 deposition, which resulted in the formation of small crystal particles and compact PbO2 films. XRD study showed the β-form crystal of electrode. The electrode was tested in synthesis of 4-picoline acid by electro-oxidation of 4-picoline, showing good electroconductivity and stable life.
文摘In this paper, a new “green” route to the synthesis of adipic acid is reported. This environmentally benign synthesis of adipic acid involves in the direct oxidation of cyclohexene catalyzed by Na2WO4·2H2O with 27 5% aqueous hydrogen peroxide using alkyl ammonium sulfate as a phase transfer agent. The results show that N,N-dimethyl-dodecylammonium sulfate, dodecylammonium sulfate and tri-n-octylammonium sulfate can be used as efficient phase transfer agents for this reaction under refluxing temperature. After the reaction is stopped, the homogeneous solution was cooled to 0 ℃ for 12 h. Then the crystalline product was collected by filtration and dried in air, a colorless, analytically pure product adipic acid was obtained in 52.1%—94.1% yields. The catalyst in concentrated filtrate can be reused.
