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Received November 29, 2003
Accepted April 19, 2004
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Co3O4/γ-Al2O3 촉매상에서 저온 일산화탄소 산화반응
Low Temperature CO Oxidation over Co3O4/γ-Al2O3 Catalyst
충북대학교 안전공학과, 361-763 충북 청주시 흥덕구 개신동 산4 1충북대학교 화학공학과, 361-763 충북 청주시 흥덕구 개신동 산4
Department of Safety Engineering, Chungbuk National University, 48 Gaesin-dong, Heungduk-gu, Cheongju 361-763, Korea 1Department of Chemical Engineering, Chungbuk National University, 48 Gaesin-dong, Heungduk-gu, Cheongju 361-763, Korea
chshin@chungbuk.ac.kr
Korean Chemical Engineering Research, June 2004, 42(3), 371-374(4), NONE Epub 12 July 2004
Abstract
Co3O4/γ-Al2O3촉매상에서 저온 일산화탄소의 산화반응을 전처리 온도 변화 및 반응물의 수분 존재에 따른 영향을 검토하였다. 500 ℃이하의 온도에서 촉매가 전처리되었을 때 5 ppm 이하의 수분에 의해서도 촉매가 현저히 비활성화되는 것으로 관찰되었다. 그러나 촉매가 550 ℃에서 전처리 된 경우에 미량의 수분 존재는 촉매 활성에 거의 영향을 미치지 않는 것으로 확인되었다. 또한 -15-40 ℃의 반응 온도 영역에서 온도 증가에 따라 활성이 감소되는 경향이 관찰되었다.
The effects of the pretreatment temperature of Co3O4/γ-Al2O3 catalyst and the presence of a trace amount of water in the reactant stream on the reactivity in the low temperature CO oxidation have been investigated. The presence of ca. 5 ppm of water in the reactant stream was found to result in a notable deactivation of reactivity of the Co3O4/γ-Al2O3 catalyst, when the catalyst was pretreated at temperatures below 500 ℃. In contrast, the presence of this small amount of water had no influence on the catalyst activity when the pretreatment temperature is elevated to 550 ℃. In the reaction temperature range of .15-40 ℃, a decrease of catalytic activity with increasing reaction temperature is observed. This means the existence of negative activation energy.
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