Relationship between ethanol gas sensitivity and surface catalytic property of tin oxide sensors modified with acidic or basic oxides
✍ Scribed by Teruyuki Jinkawa; Go Sakai; Jun Tamaki; Norio Miura; Noboru Yamazoe
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 319 KB
- Volume
- 155
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
Ž
. A semiconductor gas sensor using SnO was loaded with acidic or basic oxides 5 wt.% to investigate ethanol-gas 2 sensing properties and related catalytic properties. The sensitivity to ethanol gas at 3008C increased tremendously with an Ž . Ž . addition of a basic oxide e.g., La O , while it hardly changed with that of an acidic oxide WO . It turned out that the 2 3 3 addition of the basic metal oxide to SnO brought about enhancement of catalytic activity not only for the dehydrogenation 2 of ethanol gas to CH CHO but also for the consecutive oxidation of CH CHO to CO . On the other hand, the acidic metal 3 3 2 oxide enhanced only the dehydration reaction, showing even an adverse effect on the consecutive oxidation. Based on these results, it was concluded that the enhancement of the catalytic oxidation activity to an appropriate level could be a reason for the high sensitivity to ethanol gas for the sensors loaded with basic oxides, particularly one loaded with La O . q 2000 2 3
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