CO gas sensor based on Au-La2O3 added SnO2 ceramics with siliceous zeolite coat

被引：57

作者：

Fukui, K ^{[1
]}

Nishida, S ^{[1
]}

机构：

[1] New Cosmos Elect, Yodogawa Ku, Osaka 532, Japan

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1997年 / 45卷 / 02期

关键词：

CO selective gas sensor; La2O3-Au/SnO2; ceramics; siliceous zeolites; acidic catalyst; dehydration; ethanol filtering effects; a simple model of chemical dynamics;

D O I：

10.1016/S0925-4005(97)00280-3

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The CO selective gas sensor based on La2O3-Au/SnO2 ceramics had a high selectivity to CO among H-2, CH4, i-C4H10, and C2H4; while a high sensitivity to C2H5OH. An acidic catalyst layer converting C2H5OH into C2H4 with a low sensitivity by dehydration was coated on the sensing layer of the La2O3-Au/SnO2 ceramics to reduce the sensitivity to C2H5OH. Ferrierite, one of siliceous zeolites, was found to have a prominent ethanol filtering effect; such a prominent performance was related to a strong acid strength and a large acid amount. The siliceous zeolites have a hydrophobic property, a specific area of more than a few hundreds in m(2) g(-1) and a thermal stability. As for the ethanol filtering effects, ka/D greater than or equal to 10(5) was estimated on the basis of a simple model of chemical dynamics, k: a rate constant of dehydration, a: an effective reaction area of the catalyst layer, D: a diffusion coefficient in the filtering layer of ferrierite. As a result, a CO selective gas sensor with a sensitivity to CO over ten times higher than that to the other gases was obtained at about 300 degrees C. (C) 1997 Elsevier Science S.A.

引用

页码：101 / 106

页数：6