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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 37, Number 1
JKCSEZ 37(1)
February 20, 1993 

 
Title
An Application of Optoacoustic Technique for the CO Oxidation Reaction Catalyzed by Gd1-xSrxCoO3-y

광음향분광법을 이용한 CO 산화반응에서의 Gd1-xSrxCoO3-y 촉매효과 연구
Author
Hee-Seok Kang, Ka-Won Oum, Jin-Soo Hwang, Chul-Hyun Yo, Joong-Gill Choi

강희석, 엄가원, 황진수, 여철현, 최중길
Keywords
Abstract
CO 산화반응의 촉매로 사용되는 페로브스카이트 금속산화물인 Gd1-xSrxCoO3-y (x = 0.00, 0.25, 0.50, 0.75) 계의 촉매효과를 조사하기 위하여 광음향 분광법을 사용하였다. 산화반응으로부터 생성된 CO2의 광음향신호를 Gd1-xSrxCoO3-y에서 각각의 x값에 대하여 반응시간, 반응기체인 CO와 O2의 농도비, 그리고 온도에 따라 측정함으로써 CO 산화반응의 Gd1-xSrxCoO3-y 촉매 특성에 대한 정보를 얻었다. Gd1-xSrxCoO3-y에서 Gd가 Sr로 치환됨에 따른 촉매효과는 x=0.25일 때 최대로 나타났으며 반응 온도에 대하여는 200℃ 이상에서 급격히 증가하는 것을 알 수 있었다. C)2 레이저 광음향분광법은 반응에 대한 연속적인 측정을 가능케 함으로써 CO 산화반응의 촉매효과 연구뿐만 아니라 일반적인 반응속도 연구에도 응용할 수 있는 방법임이 확인되었다.

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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