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Received November 18, 2016
Accepted December 27, 2016
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Al-Ce 산화물에 담지된 CuO 촉매상에서 저온 CO산화반응
Low Temperature CO Oxidation over CuO Catalyst Supported on Al-Ce Oxide Support
한국화학연구원 탄소화자원연구소 온실가스자원화그룹, 34114 대전광역시 유성구 가정로 141 1충북대학교 산학협력단, 28644 충청북도 청주시 서원구 충대로 1 2충북대학교 화학공학과, 28644 충청북도 청주시 서원구 충대로 1
Greenhouse Gas Resources Research Group, Carbon Resource, Korea Research Institute of Chemical TechnologyInstitute, 141, Gajeong-ro, Yuseong-gu, Daejeon, 34114, Korea 1Industry-University Cooperation Foundation, Chungbuk National University, 1, Chungdae-ro, Seowon-gu, Cheongju, Chungbuk, 28644, Korea 2Department of Chemical Engineering, Chungbuk National University, 1, Chungdae-ro, Seowon-gu, Cheongju, Chungbuk, 28644, Korea
chshin@chungbuk.ac.kr
Korean Chemical Engineering Research, April 2017, 55(2), 156-162(7), 10.9713/kcer.2017.55.2.156 Epub 31 March 2017
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Abstract
CuO의 함량이 반응활성에 미치는 영향을 조사하기 위하여 CuO(x)/0.3Al-0.7Ce (x = 2~20 wt%) 촉매를 함침법으로 제조하고 저온 CO 산화반응을 수행하였다. CuO(10)/0.3Al-0.7Ce 촉매가 반응물 중 수분의 존재 유무에 관계없이 가장 우수한 반응활성을 나타내었다. 수분의 존재는 활성점에 CO와의 경쟁흡착으로 활성점이 감소하여 50% CO 전환율 온도인 T50%가 약 50 °C 고온으로 이동되어 관찰되었다. N2O-적정실험으로 구한 구리 표면적과 CO-펄스 실험으로 계산된 격자산소의 양은 CuO의 함량 증가에 따라 증가하였고, CuO(10)/0.3Al-0.7Ce 촉매에서 최대화되었다. 이러한 특성 분석결과는 사용된 촉매의 CO 산화반응에 대한 T50%의 경향과 잘 일치하였다. 위의 특성분석 결과로부터, CuO(x)/0.3Al-0.7Ce 촉매의 CO 산화반응에 대한 반응성은 구리 표면적과 격자산소의 양과 밀접하게 관련된다고 결론지을 수 있다.
CuO(x)/0.3Al-0.7Ce catalysts with different CuO loadings (x = 2~20 wt%) were prepared by impregnation method and investigated the effects of CuO loadings on the low temperature CO oxidation. Of the used catalysts, the CuO(10)/0.3Al-0.7Ce catalyst showed the highest catalytic performance in the absence or presence of water vapor. In the presence of water vapor, the catalytic performance was drastically decreased, with a temperature of 50% CO conversion (T50%) shifted to higher temperature by 50 °C compared to the those in dry conditions because of the competitive adsorption of water vapor on the active sites. The copper metal surface area calculated from N2O-titration analysis and the oxygen capacity from CO-pulse experiments were increased with the CuO loadings and showed a maximum at 10 wt%CuO/0.3Al-0.7Ce catalyst. These trends are in good agreement with the tendency of T50% of the catalysts. From these characteristic aspects, it could be deduced that the catalytic performance was closely related to the oxygen capacity and the copper metallic surface area.
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