One-step anodic acetoxylation of benzene to phenyl acetate was studied in acetic acid-water solution using a one-compartment electrochemical cell in galvanostatic mode. Compared to the anhydrous system, the addition o...One-step anodic acetoxylation of benzene to phenyl acetate was studied in acetic acid-water solution using a one-compartment electrochemical cell in galvanostatic mode. Compared to the anhydrous system, the addition of water improved the current efficiency for the electrosynthesis of phenyl acetate. The maximum efficiency reached 4.8% with the selectivity of 96% to phenyl acetate when the electrolysis was carried out under the optimal conditions. The investigation also indicated that the concentration of phenyl acetate increased linearly in 12 h and reached 1.07 g/L with the selectivity of 95%. Cyclic voltammetry experiments showed that the adsorption of benzene at Pt anode enhanced by the addition of water was critical to the formation of phenyl acetate. An activated benzene mechanism was proposed for the anodic acytoxylation, and the analysis of gas products demonstrated that Kolbe reaction was the main side reaction.展开更多
Fe modified hollow carbon spheres with large cavity and mesoporous shell （Fe-MHCs） were successfully synthesized by a simple pyrolysis and simultaneous deposition method. The organic molecules gases （carbon species...Fe modified hollow carbon spheres with large cavity and mesoporous shell （Fe-MHCs） were successfully synthesized by a simple pyrolysis and simultaneous deposition method. The organic molecules gases （carbon species） from pyrolysis of polystyrene deposited in the hard template at the catalysis of Fe species existing in the sample during calcination at high temperature. The obtained Fe-MHCs showed uniform spherical morphology with large surface area （924 m^2 g^-1）, mesoporous structure and a certain amount of Fe loaded. The Fe species and the special structure endowed the materials excellent catalytic activity in the oxidation of ethylbenzene to acetophenone. The conversion of 94.5% and the high selectivity to targeted product （97.4%） could be achieved and the acceptable recycling stability was also exhibited.展开更多
基金ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.21021001, No.20502017, and No.20872102）, and the Program for Changjiang Scholars and Innovative Research Team in University （No.0846）. The Analytic and Testing Center of Sichuan University are greatly appreciated.
文摘One-step anodic acetoxylation of benzene to phenyl acetate was studied in acetic acid-water solution using a one-compartment electrochemical cell in galvanostatic mode. Compared to the anhydrous system, the addition of water improved the current efficiency for the electrosynthesis of phenyl acetate. The maximum efficiency reached 4.8% with the selectivity of 96% to phenyl acetate when the electrolysis was carried out under the optimal conditions. The investigation also indicated that the concentration of phenyl acetate increased linearly in 12 h and reached 1.07 g/L with the selectivity of 95%. Cyclic voltammetry experiments showed that the adsorption of benzene at Pt anode enhanced by the addition of water was critical to the formation of phenyl acetate. An activated benzene mechanism was proposed for the anodic acytoxylation, and the analysis of gas products demonstrated that Kolbe reaction was the main side reaction.
基金supported by the National Natural Science Foundation of China (21676070)Hebei Natural Science Foundation (B2015208109)+3 种基金Hebei Training Program for Talent Project (A201500117)Five Platform Open Fund Projects of Hebei University of Science and Technology (2015PT37)Hebei One Hundred-Excellent Innovative Talent Program (Ⅲ) (SLRC2017034)Hebei Science and Technology Project (17214304D and 16214510D)
文摘Fe modified hollow carbon spheres with large cavity and mesoporous shell （Fe-MHCs） were successfully synthesized by a simple pyrolysis and simultaneous deposition method. The organic molecules gases （carbon species） from pyrolysis of polystyrene deposited in the hard template at the catalysis of Fe species existing in the sample during calcination at high temperature. The obtained Fe-MHCs showed uniform spherical morphology with large surface area （924 m^2 g^-1）, mesoporous structure and a certain amount of Fe loaded. The Fe species and the special structure endowed the materials excellent catalytic activity in the oxidation of ethylbenzene to acetophenone. The conversion of 94.5% and the high selectivity to targeted product （97.4%） could be achieved and the acceptable recycling stability was also exhibited.
