With a CO Combustible Gas Sensor

As CO is highly toxic, and causes respiratory problems, its elimination is quite important Industrially, CO elimination is required for C02 laser application, and the production of pure hydrogen for fuel cells. Catalysis testing of the reaction has been performed, independently, with an IR gas-sensor by Hoffmann et al. and with a combustible CO gas sensor by Yamada et al. [25, 26]. In both groups, C02 produced by CO oxidation was quantified by an IR gas-sensor. 

Dilute CO elimination from air has been rapidly evaluated using CO gas sensors [25, 26]. The oxidation of 1 vol% CO in air was carried out under atmospheric pressure from 30 to 150 °C with a ramp rate of 2°C min-1. The CO concentration of an effluent from the reactor was continuously determined by the CO gas sensor. Fig. 8.1 shows the output signal and CO conversion determined by the CO gas sensor, and the CO conversion determined by FID-GC, for CO oxidation over Rh/Ti02. This indicates that the CO concentration decreases with increasing temperature, i.e., the CO conversion rate increases at higher temperature. The closed circles in Fig. 8.1 indicate the CO conversion determined by gas chromatography. The conversion curve calculated from the output signals of the CO gas sensor is 

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