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首页> 外文期刊>Advances in Environmental Technology >Electrochemical hydrogenation and desulfurization of thiophenic compounds over MoS2 electrocatalyst using different membrane-electrode assembly
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Electrochemical hydrogenation and desulfurization of thiophenic compounds over MoS2 electrocatalyst using different membrane-electrode assembly

机译：MoS2电催化剂上不同膜-电极组件对噻吩化合物的电化学加氢和脱硫

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Desulfurization-hydrogenation of thiophene and benzothiophene in hexadecane as a model diesel fuel was studied through a divided cell with the incorporation of the membrane electrode assembly (MEA) under different current density at a constant charge. The reduction of thiophenic compounds was investigated using prepared MoS2 nano-electrocatalyst and Nafion (commercial proton exchange membrane) and synthesized sulfonated poly ether ether ketone, SPEEK. The MoS2 electrocatalyst was characterized by field emission scanning electron microscopy and X-ray diffraction, which confirmed the formation of ball-like nano-thread of MoS2 with the size of 23-25 nm. Also, the electrocatalyst and/or MEA was electrochemically analyzed by cyclic voltammetry, linear sweep voltammetry, and electrochemical impedance spectroscopy. The gas chromatography-mass spectroscopy analysis of reactants and products revealed the direct desulfurization on thiophene reduction process and desulfurization along with desulfurization pathway on benzothiophene reduction experiment. Maximum desulfurization efficiency of 79.6% at 20 mA cm-2 and 51.5% at 30 mA cm-2 under the constant charge of 300 C was obtained for thiophene using MoS2-Nafion and MoS2-SPEEK system respectively. Moreover, maximum hydrogenation and desulfurization efficiency of 28% and 59.1% occurred at 50 mA cm-2 and 70 mA cm-2 respectively for Benzohiophene-Nafion system under the constant charge of 400 C. distribution of products affirmed the more contribution of desulfurization reaction at higher current density against the hydrogenation process at lower current density.
机译：通过在分开的电池中并结合膜电极组件（MEA）在恒定电流下在不同电流密度下研究了十六烷中作为模型柴油燃料的噻吩和苯并噻吩的脱硫加氢。使用制备的MoS2纳米电催化剂和Nafion（商业质子交换膜）和合成的磺化聚醚醚酮SPEEK，研究了噻吩化合物的还原。通过场发射扫描电子显微镜和X射线衍射对MoS2电催化剂进行了表征，证实形成了尺寸为23-25 nm的MoS2球形纳米线。而且，通过循环伏安法，线性扫描伏安法和电化学阻抗谱对电化学催化剂和/或MEA进行了电化学分析。气相色谱-质谱联用法分析了反应物和产物的还原过程，对噻吩还原过程进行了直接脱硫，并在苯并噻吩还原实验中进行了脱硫。使用MoS2-Nafion和MoS2-SPEEK系统分别在300 C的恒定电荷下，在20 mA cm-2下的最大脱硫效率为79.6％，在30 mA cm-2下的最大脱硫效率为51.5％。此外，在400 C的恒定电荷下，苯并噻吩-Nafion系统在50 mA cm-2和70 mA cm-2时分别出现28％和59.1％的最大加氢和脱硫效率。产物分布证实了脱硫反应的贡献更大。在较高电流密度下相对于较低电流密度下的氢化过程。

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