双组分助催化剂瓦斯传感器催化元件的试验研究

由于瓦斯传感器催化元件高温下载体易烧结,活性下降及易毒化,因此尝试用稀土元素对瓦斯传感器催化元件进行改性,对掺杂稀土双组分催化剂的n-Ce-Zr-Al2O3和普通纳米催化剂n-Al2O3的比表面积、活性、稳定性进行试验,试验结果表明,掺杂Ce-Zr助催化剂的催化元件,其反应活性明显增强,在体积分数为1%的CH4下其工作温度比普通催化元件降低约40℃,反应的稳定性也明显增强。将此瓦斯催化元件接入测试模块进行误差测试,试验证明,体积分数为1%～5%的CH4下其最大测量误差约为3%,远小于国家标准,完全符合瓦斯检测要求。

Experiment Study on Catalytic Element of Double Group Co-Catalyst Gas Sensor

Due to the easy firing of the catalytic elements in the gas sensor,the activity reduction and poisoning,the rare-earth elements were tried to modify the catalytic elements of the gas sensor.A test was conducted on the special surface area,activity and stability of the n-Ce-Zr-Al2O3 catalyst mixed with rare-earth double group components and the n-Al2O3 common nano catalyst.The test results showed that the catalytic elements of the mixed Ce-Zr co-catalyst,the reaction activity was obviously improved,the working temperature of the methane with the volume fraction of 1% could be reduced by 40 ℃ than the common catalytic elements and the reaction stability was obviously improved.The gas catalytic elements was inserted into the test module for the error test.The test showed that under methane with volume fraction of 1%～5%,the max measuring error was about 3%,far below than the national standard and was fully met with the gas detection requirements.