Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Fabrication and characterization of ZrxCe1-xO2 catalytic powder by a hydrothermal process

수열합성공정에 의한 ZrxCe1-xO2 촉매 분말의 제조 및 특성

  • Choi, Yeon-Bin (Department of Advanced Materials Science and Engineering, Changwon National University) ;
  • Son, Jeong-hun (Department of Advanced Materials Science and Engineering, Changwon National University) ;
  • Sohn, Jeong Ho (School of Port and Logistics, Kaya University) ;
  • Bae, Dong-Sik (Department of Advanced Materials Science and Engineering, Changwon National University)
  • 최연빈 (창원대학교 신소재공학부) ;
  • 손정훈 (창원대학교 신소재공학부) ;
  • 손정호 (가야대학교 항만물류학과) ;
  • 배동식 (창원대학교 신소재공학부)
  • Received : 2017.08.30
  • Accepted : 2017.11.13
  • Published : 2017.12.31
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Abstract

The ceria powder is excellent in oxygen storage capacity (OSC) through the oxidation and reduction reaction of Ce ions and is used as a typical material for a three-way catalyst of an automobile which purifies the exhaust gas. However, since ceria generally has poor thermal stability at high temperatures, it is doped with metal ions to improve thermal stability. Therefore, in this study, Zr ions were doped into ceria powder, and their characteristics were further improved due to the increase of specific surface area with decreasing particle size due to doping. In this study, the synthesis of zirconium doped ceria nanopowder was synthesized by hydrothermal process. In order to synthesis Zr ion doped ceria nanopowder, the precursor reaction at was $200^{\circ}C$ for 6 hours. The average particle size of synthesized Zr doped $CeO_2$ nanopowder was below 20 nm. The specific surface area of synthesized Zr ion doped ceria nanopowder increased from $52.03m^2/g$ to $132.27m^2/g$ with Zr increased 30 %.

세리아 분말은 Ce 이온의 산화, 환원 반응을 통한 산소저장능력(OSC)이 뛰어나 배기가스를 정화하는 자동차의 삼원촉매에 대표적인 재료로 사용된다. 그러나 일반적으로 세리아는 고온에서 열적 안정성이 떨어지기 때문에 금속이온을 도핑시켜 열적 안정성을 향상시켜 사용한다. 따라서 본 연구에서는 Zr 이온을 세리아 분말에 도핑시켰고, 도핑으로 인해 입자크기가 감소하면서 비 표면적 증가로 인해 그 특성은 더욱 향상되었다. 그리고 본 연구에서는 세리아 및 Zr 이온이 도핑된 세리아를 나노 크기로 합성하기 위해 수열반응법을 이용하여 합성하였다. 수열합성 조건은 pH = 11, 반응온도는 $200^{\circ}C$에서 6시간 동안 합성하였다. 수열합성법을 이용하여 합성된 세리아 및 Zr 도핑 $CeO_2$ 나노 분말의 평균 입자 크기는 약 20 nm 이하였다. 합성된 세리아 나노분말의 비표면적은 $52.03m^2/g$, Zr 이온이 도핑된 $CeO_2$ 분말의 비 표면적 $132.27m^2/g$이었다.

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References

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