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Ultrasound-assisted electrocatalytic hydrogenation in water
Applied Catalysis A: General ( IF 4.7 ) Pub Date : 2017-11-21 , DOI: 10.1016/j.apcata.2017.11.013
Josinete Angela da Paz , Ayrlane Sales , Larissa Dias da Silva , Émerson Felipe Mendonça da Silva , José Angelo Peixoto da Costa , Marcelo Navarro , Frederico Duarte de Menezes , Márcio Vilar

The optimum conditions for the electrocatalytic hydrogenation of (R)-(+)-pulegone in water, using ultrasound (continuous or pulsed mode) and a nickel sacrificial anode have been determined. The continuous ultrasound (14 W), without temperature control, showed to be a most effective technique if compared with pulses of 0.2 s applied after each second. The sonication of the reaction solution presented a slight stereochemical effect on the product distribution, and its magnitude depends on both the ultrasound power and the mode. Simultaneous ultrasound irradiation during electrochemical process showed a synergetic effect, able to generate H radical from water HO bond rupture, in addition to the H radicals formed by the electrochemical reduction of water on the electrode surface, increasing both current efficiency and conversion yields. Chitosan microspheres were use in the removal of nickel ions of the aqueous medium showing an adsorption efficiency of 64%.



中文翻译:

超声辅助水中的电催化加氢

确定了使用超声(连续或脉冲模式)和镍牺牲阳极在水中电催化氢化(R)-(+)-普勒酮的最佳条件。如果与每秒之后施加0.2 s的脉冲相比,没有温度控制的连续超声(14 W)被证明是最有效的技术。反应溶液的超声处理对产物的分布表现出轻微的立体化学作用,其幅度取决于超声功率和模式。电化学过程中同时进行超声辐照具有协同作用,能够从水中产生H自由基除了通过电化学还原电极表面上的水而形成的H自由基外,O键断裂还提高了电流效率和转化率。壳聚糖微球用于去除水介质中的镍离子,显示出64%的吸附效率。

更新日期:2017-11-21
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