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An application of the optoacoustic detection method to investigate the catalytic effect of a perovskite, Gd1-xSrxCoO3-y (x = 0.00, 0.25, 0.50, 0.75) system, in the oxidation reaction of CO is described. The optoacoustic signals Of CO2 produced from the oxidation reaction were measured for differing x values in Gd1-xSrxCoO3-y. By monitoring optoacoustic signals with respect to the time, the concentration ratios of CO and O2, and the temperature, the kinetic information on the catalytic properties of the perovskite for CO oxidation reaction can be obtained. The effect of Sr substitution in Gd1-xSrxCoO3-y has been found to show the maximum catalytic effect at x = 0.25 and the substantial increase in catalytic activity at temperatures above 200℃. It demonstrates that the optoacoustic detection method allows the investigation of the integrated catalytic effect not only for the oxidation reaction of CO, but also for many reactions, in general, by continuously and directly detecting the species associated with the reactions.
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