Li_2O·MnO_2-Ag-YSZ氧泵型反应器中NEMCA效应的研究

Investigation of NEMCA Effect in the Li2OMnO2AgYSZ Catalytic Membrane Reactor

本文对Ｌｉ２Ｏ·ＭｎＯ２－Ａｇ－ＹＳＺ氧泵型催化膜反应器中甲烷氧化偶联反应的ＮＥＭＣＡ效应进行了研究。考察了稳态电流和反应温度对ＮＥＭＣＡ效应的影响，考察了反应气中甲烷含量、反应温度对发生ＮＥＭＣＡ效应时的交换电流密度的影响，比较了传递体系和联合体系的交换电流密度与活性过电位的关系。结果表明：高甲烷含量、低反应温度和反应气中引入极少量的Ｏ２，可降低三相界面的交换电流密度。

NEMCA effect of OCM was investigated on the Li2OMnO2AgYSZ catalytic membrane in the oxygenpumping reactor.The influence of the steadystate current and reaction temperature on NEMCA effect was investigated,so did the CH4 content in the reaction gas and reaction temperature on the exchange current density when NEMCA took place.The relation of the exchange current density and the active over potential in the transport system was compared to that in the joint system.The results show that the exchange current density in the threephaseboundary is decreased by increasing the content of CH4 in the reaction gas,decreasing reaction temperature and adding small amount oxygen into the reaction gas.Low exchange current density is favorable to the generation of NEMCA effect.