Highly selectivte sensor to CH4 in presence of CO and ethanol using LaCoO3 perovskite filter with Pt/SnO2

被引：0
|
作者：
Ajami, S [1 ]
Mortazavi, Y [1 ]
Khodadadi, A [1 ]
Pourfayaz, F [1 ]
Mohajerzadeh, S [1 ]
机构：
[1] Univ Teheran, Catalysis & Nano Structed Mat Lab, Tehran, Iran
来源：
Transducers '05, Digest of Technical Papers, Vols 1 and 2 | 2005年
关键词：
methane selective sensor; active filter; LaCoO3; perovskite;
D O I：
暂无
中图分类号：
R318 [生物医学工程];
学科分类号：
0831 ;
摘要：
In the present investigation, LaCoO3 is used as an active filter for elimination of the sensor sensitivity to carbon monoxide and ethanol. A sol-gel procedure was used for the preparation of SnO2 fine powder, which was impregnated with hexachloroplatinic acid to obtain 1.0 wt% Pt on SnO2. The LaCOO3 perovskite fine powder was prepared by citrate method, using nitrate precursors of La and Co, to act as active filter. The LaCOO3 perovskite caused the sensitivity of the sensor to CO and ethanol declined significantly. It seems that the perovskite oxidizes CO and ethanol at temperatures lower than 250 degrees C whereas methane is not affected at temperature as high as 450 degrees C. This way the perovskite filter eliminates the sensor sensitivity to CO and ethanol, making the sensors highly selective to methane in presence of CO and ethanol in air.
引用
收藏
页码：1907 / 1910
页数：4
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