稀土在瓦斯载体催化元件中抗积碳作用的研究

Study of AntiCarbonAccumulating Action of Rare Earth in Catalytic Cell of Gas Carrier

在实际应用中，瓦斯传感器常因载体催化传感元件表面积碳或孔被堵塞而失去活性，导致仪器灵敏度及使用寿命降低，针对这一问题，重点考察了常用稀土氧化物（如ＣｅＯ２）对瓦斯载体催化传感元件催化剂Ｐｔ／γ－Ａｌ２Ｏ３积碳生成的影响．实验证明，稀土（ＲＥ）掺杂确有抑制积碳生成的作用，同时也可提高催化剂的催化反应活性．研究中对稀土的抗积碳作用机理进行了初步探讨。

Practical gas sensor often loses activation because of carbonaccumulating on the surface of catalytic sensor, that results in a reduction of sensitivity and life span. This paper mainly investigates the influence of rare earth (RE) oxide, such as CeO2, on carbonaccumulating in catalyst Pt/Al2O3 of catalytic sensor. The research shows that mixing RE can control the carbonaccumulating and improve the catalytic activation, and the accumulated carbon can be removed by a highly dispersing process and the oxygenstoring action of RE. The anticarbonaccumulating mechanism of RE is also discussed.