La2O3-SnO2材料乙醇气敏性能与催化活性间关系  

Relationship between the ethanol gas-sensing property and catalytic activity of La_2O_3-SnO_2 material

作　　者：詹自力[1] 谢英男[1] 潘丽华[1] 郭新勇[2] 蒋登高[1] 

机构地区：[1]郑州大学化工学院,河南郑州450001 [2]河南大学特种功能材料重点实验室,河南开封475001

出　　处：《电子元件与材料》2008年第3期19-21,共3页Electronic Components And Materials

基　　金：河南省重点科技攻关资助项目(No.0423021700);河南省科技攻关资助项目(No.0624220059)

摘　　要：通过测量La2O3-SnO2的气敏性能和催化活性,考察了La2O3对SnO2气敏性能和催化性能的影响,同时讨论了该材料对甲烷(CH4)和乙醇(C2H5OH)的灵敏度与其催化氧化反应间的关系。结果表明:300℃时,掺杂w(La2O3)为3%时,可使乙醇的转化率从84.5%提高到100%,对体积分数为1×10-4的乙醇的灵敏度由11.06提高到53.22。说明目标气体的反应活性越高,其灵敏度也越高。掺杂La2O3提高乙醇气体的灵敏度的原因是因为增加了SnO2表面乙醇反应中的耗氧率。The effects of La203 on the gas-sensing properties and catalytic properties of SnO2 were investigated by measuring the gas-sensing and catalytic properties of La203-SnO2 material. The relationship between the catalytic oxidation reaction and sensitivity for CH4 and C2H5OH was discussed. The conversion rate of C2H5OH increases from 84.5% to 100%, and the sensitivity to lxl0-4C2H5OH （volume fraction） increases from 11.06 to 53.22 at 300 ℃ by doping 3% La203 （mass fraction）. The results show that the higher the reaction activity of target gas, the higher the sensitivity is. The enhancement of sensitivity of La203-doped sensor to C2H5OH is Attributed to increase of oxygen consumption rate by the catalytic oxidation reaction on the surface of SnO2.

关 键 词：无机非金属材料 气敏性能 催化性能 掺杂 Sn02 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] O643[自动化与计算机技术—控制科学与工程]