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应用电化学循环伏安法(CV)和现场红外光谱(FTIR),研究了酸性溶液中钯催化甲醇、乙二醇电氧化的过程.结果表明:在酸性和中性介质中,甲醇和乙二醇在多晶Pd电极上氧化须在1.5V以上才能发生.随着溶液pH值的降低,过电位减小且峰电流密度上升.溶液的pH值以及电极表面形成的吸附含氧物种对Pd电催化氧化醇有显著的影响.现场红外光谱电化学测试显示,在高电位和强酸性介质中,乙二醇在Pd电极上的氧化产物主要是CO2和少量的乙二酸.在酸性和中性介质中,无论在低电位或高电位,甲醇和乙二醇在Pd上氧化的主要产物是CO2,没有发现CO的存在,说明该氧化过程CO2是经过非毒化的路径产生的.
The electrochemical oxidation of methanol and ethylene glycol in acidic solution was studied by electrochemical cyclic voltammetry (CV) and field emission spectroscopy (FTIR). The results showed that methanol and ethylene di The oxidation of alcohol on the polycrystalline Pd electrode must occur above 1.5 V. As the solution pH decreases, the overpotential decreases and the peak current density increases.The pH of the solution and the adsorption of oxygen species formed on the electrode surface affect the Pd The results showed that the oxidation products of ethylene glycol on Pd electrode were mainly CO2 and a small amount of oxalic acid in the high potential and strong acid medium.The acidity and neutrality In the medium, the main product of oxidation of methanol and ethylene glycol on Pd is CO2 at low or high potential, and no CO is found, indicating that the oxidation of CO2 is through a non-toxic route.