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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 24, Number 3
JKCSEZ 24(3)
June 20, 1980 

Catalytic Oxidation of Carbon Monoxide on Pt and SnO2

Pt 및 SnO2 촉매하에서의 일산화탄소의 산화반응
Kwang Yul Choo, Hasuck Kim, Bonghyun Boo

주광렬, 김하석, 부봉현
SnO2, Sb-doped SnO2, 그리고 백금촉매하에서 일산화탄소의 산화반응을 연구하였다. SnO2 및 Sb-doped SnO2 촉매하에서 산화반응은 CO 및 O2에 대해서 각각 1차, 백금 촉매하에서는 1/2차 반응에 따랐다. SnO2에 소량의 Sb첨가(dopant composition : 0.05∼0.1mole%)는 반응속도를 증가시키고 그 이상의 첨가는 오히려 반응속도를 감소시켰다. 백금 촉매하의 산화반응에서는 일산화탄소의 농도가 증가함에 따라 반응속도가 오히려 감소하는 억제효과를 보여주었다. 각 촉매하에서 산화반응의 활성화에너지는 Sb-dopoped SnO2 촉매 (dopant compisito : 0.05 mole%)에서 5.7 kcal, 백금 촉매에서 6.4 kcal이었다. 실험적으로 얻은 반응차수와 doping 효과로부터 가능한 반응메카니즘을 제안하였다.

Oxidation reactions of carbon monoxide on SnO2, Sb-doped SnO2, and Pt catalyst were studied. The oxidation reaction was found to be first order with respect to both CO and O2 on SnO2 and Sb-doped SnO2 catalysts, and to be of half order on Pt catalyst. A small addition of Sb to SnO2 (depant composition: 0.05∼0.1 mol %) increased the rate of oxidation. On the contrary, a large addition decreased the rate. From the rate expression of oxidation on Pt catalyst, the inhibition effect of carbon monoxide on the rate of oxidation was deduced. The experimentally obtained activatio energies were 5.7 kcal for the Sb doped SnO2 catalyst (dopant composion: 0.05 mole%), and 6.4 kcal for the Pt catalyst. A possible reaction mechanism was proposed from the experimentally obtained kinetic data.

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