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在常压及 6 5 0℃下 ,以含 1%O2 的甲烷 氧混合气进料 ,考察了在CaO ,SrO ,ZnO ,TiO2 ,CeO2 和MnO2 膜上外加电流为 - 90～ 90mA范围内联合体系的甲烷氧化偶联反应 .结果表明 ,在 p型和n型半导体催化膜上 ,发生NEMCA效应的增强因子有一极值 ,联合体系中泵氧OCM反应的C2 烃选择性低于开路体系中反应的C2 烃选择性 .根据总反应速率求出了总传递系数及电化学影响效率 .电化学影响效率随n型电导率的增大而变大 .通过极化曲线求出了电化学动力学参数 .结果表明 ,施加正向或反向电流 ,电极上的电化学反应速率不相同 ,不同催化膜上的电化学反应速率也不相同 ,用同样方法制备的膜上三相界面的大小相差不大
Under normal pressure and at 650 ℃, a mixed gas of methane and oxygen containing 1% O2 was used to investigate the effect of the addition of current on the CaO, SrO, ZnO, TiO2, CeO2 and MnO2 films in the range of -90 to 90mA The results show that the enhancement factor of NEMCA effect on the p-type and n-type semiconductor catalytic membranes has an extreme value, and the C2 hydrocarbon selectivity of the pump oxygen OCM reaction in the combined system is lower than that in the open system C2 hydrocarbon selectivity.The total transfer coefficient and electrochemical effect efficiency were calculated according to the total reaction rate.Electrochemical influence efficiency increased with the increase of n-type conductivity.The electrochemical kinetic parameters were obtained by polarization curves. The results show that the electrochemical reaction rates on the electrodes are different from each other when positive or negative current is applied, and the electrochemical reaction rates are not the same on different catalytic membranes. The three-phase interface sizes produced by the same method are not different