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测定了十个Ln_0.7Sr_0.3MnO_3催化剂(Ln为稀土离子)在真空、氧气氛及乙烷气氛中不同温度下的电导值。在真空中表现为混合导体特征,并发现单一钙钛矿晶型催化剂的电导值最高。在四个单一钙钛矿型催化剂中,有电导值愈高,乙烷氧化活性愈低的趋势。在氧气气氛中,IgG—1/T曲线在高温时斜率明显变小的样品,乙烷氧化活性较高。还测定了Nd_0.7Sr0.3MnO_3上,分别在一氧化碳和氧气气氛中,电导随时间的变化,发现一氧化碳和氧的电导变化方向相同。
The conductance values of ten Ln 0.7 Si 0.3 MnO 3 catalysts (Ln is a rare earth ion) were measured at different temperatures in vacuum, oxygen and ethane atmospheres. It behaves as a mixed conductor in vacuum and found that the conductivity of a single perovskite crystal catalyst is the highest. Among the four single perovskite catalysts, the higher the conductance value, the lower the ethane oxidation activity. In the oxygen atmosphere, the sample with a significantly slighter slope of the IgG-1 / T curve at high temperatures showed a higher ethane oxidation activity. The change of conductance with time over the Nd0.7Sr0.3MnO3, in the atmosphere of carbon monoxide and oxygen, respectively, was also determined and it was found that the conductance changes of carbon monoxide and oxygen were in the same direction.