Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Reaction Characteristics of Cu/CeO2 Catalysts for CO Oxidation

일산화탄소 산화반응을 위한 Cu/CeO2 촉매의 반응특성

  • Kim, Su Bin (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Kim, Min Su (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Kim, Se Won (Korea Institute of Industrial Technology, Thermochemical Energy System Group) ;
  • Hong, Sung Chang (Department of Environmental Energy Systems Engineering, Graduate School of Kyonggi University)
  • 김수빈 (경기대학교 일반대학원 환경에너지공학과) ;
  • 김민수 (경기대학교 일반대학원 환경에너지공학과) ;
  • 김세원 (한국생산기술연구원, 고온에너지시스템 그룹) ;
  • 홍성창 (경기대학교 환경에너지공학과)
  • Received : 2019.08.22
  • Accepted : 2019.09.11
  • Published : 2019.10.10
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Abstract

In this study, the effects of the structural properties of the catalyst on CO oxidation reaction by controlling the $Cu/CeO_2$ catalyst amount and calcination temperature were studied, and also the CO conversion rate of the catalyst at the temperature range of $100{\sim}300^{\circ}C$ was evaluated. XRD, Raman, BET, $H_2-TPR$, and XPS analyses were performed to confirm the effect of changes in the structural properties on the chemical properties of the catalyst. The result confirmed that a substitution bond between Cu and Ce was formed and a lot of Cu and Ce bonds were formed when the catalyst carrying 5 wt.%. Of Cu was calcined at $400^{\circ}C$. The Cu-Ce binding was confirmed by peak shifts in Raman analysis and also peaks appeared in $H_2-TPR$. In addition, the balance state analysis demonstrated that a lot of surface labile oxygen molecules are formed, which can be more easily contributed to the reaction with $Ce^{3+}$ species known to form a substitution bond easily. It was found that CO conversion rate of the catalyst used in this study was close to 100% at $150^{\circ}C$.

본 연구에서는 $Cu/CeO_2$ 촉매의 함량과 소성온도를 제어함으로써 촉매의 구조적 특성이 CO 산화반응에 미치는 영향과, $100{\sim}300^{\circ}C$의 온도범위에서 촉매의 CO 전환율을 평가하였다. 촉매의 구조적 특성이 변화함에 따라 촉매의 화학적 특성에 미친 영향을 확인하기 위해 XRD, Raman, BET, $H_2-TPR$, XPS 분석을 수행하였다. 이때, Cu와 Ce의 치환 결합이 형성되는 것을 확인하였고, Cu를 5 wt.% 담지한 촉매를 $400^{\circ}C$로 소성하였을 때 Cu와 Ce의 결합을 많이 이루고 있는 것으로 판단하였다. Cu와 Ce의 결합은 Raman 분석 상에서 peak의 이동과, $H_2-TPR$에서 나타난 peak를 통해 확인하였다. 또한 산화상태 분석을 통하여 치환 결합을 쉽게 이룰 수 있다고 알려져 있는 $Ce^{3+}$종과 반응에 더욱 쉽게 기인할 수 있는 표면 산소종(surface labile oxygen)이 많이 형성되어 있는 것을 확인하였다. 이때, 본 연구에서 사용한 촉매의 CO 전환율은 $150^{\circ}C$에서 100%에 가까운 수치를 나타내는 것을 확인하였다.

Keywords

References

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