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本文用热解法制成以γ-Al_2O_3珠为载体,以稀土元素铕及金属钯为活性组份的催化微卡计。 为了有效地监测空气中乙烯的浓度,我们采用了流动微卡计量热技术及乙烯在微卡计上催化氧化方法。 实验结果指出:在工作电流为300至350mA及环境温度由-20℃至50℃的给定条件下,空气中乙烯浓度C与催化微卡计的电压降V之间存在着良好的线性关系,并有良好的监测灵敏度,即V=V_o+KC。 其中K为0.36伏/%.
In this paper, a catalytic micro-calorimeter made of γ-Al 2 O 3 beads as carrier and rare-earth element europium and metal palladium as active components was prepared by pyrolysis method. In order to effectively monitor the ethylene concentration in the air, we have used a mobile micro-calorimeter and a catalytic oxidation of ethylene on a microcalcimeter. The experimental results show that there is a good linear relationship between the ethylene concentration C in the air and the voltage drop V of the catalytic micro-card under the given conditions of the working current of 300 to 350 mA and the ambient temperature from -20 ℃ to 50 ℃, And have good monitoring sensitivity, namely V = V_o + KC. Where K is 0.36 volts /%.