Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Effect of Support Geometry on Catalytic Activity of Pt/CeO2 Nanorods in Water Gas Shift Reaction

Water Gas Shift 반응에서 Pt/CeO2 촉매의 지지체구조에 따른 촉매활성 연구

  • Im, Hyo Been (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Kwon, Soon Jin (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Byun, Chang Ki (Graduate School of Energy Science and Technology, Chungnam National University) ;
  • Ahn, Hee Sung (Department of Chemical Engineering Education, Chungnam National University) ;
  • Koo, Kee Young (Hydrogen Energy Research Lab, Korea Institute of Energy Research) ;
  • Yoon, Wang Lai (Hydrogen Energy Research Lab, Korea Institute of Energy Research) ;
  • Yi, Kwang Bok (Department of Chemical Engineering Education, Chungnam National University)
  • 임효빈 (충남대학교 에너지과학기술대학원) ;
  • 권순진 (충남대학교 에너지과학기술대학원) ;
  • 변창기 (충남대학교 에너지과학기술대학원) ;
  • 안희성 (충남대학교 화학공학교육과) ;
  • 구기영 (한국에너지기술연구원) ;
  • 윤왕래 (한국에너지기술연구원) ;
  • 이광복 (충남대학교 화학공학교육과)
  • Received : 2014.10.13
  • Accepted : 2014.12.31
  • Published : 2014.12.30
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Abstract

Nanorod and particle shape $CeO_2$ were synthesized via hydrothermal process and precipitation method, respectively, and used as supports of Pt catalyst for water gas shift (WGS) reaction. Three different durations (12, 48, and 96h) for hydrothermal process were applied for the preparation of nanorod type $CeO_2$. 1.0 wt% of Pt was loaded on the prepared supports with incipient wetness method prior to the catalytic activity tests that were carried out at a GHSV of $95,541h^{-1}$, and a temperature range of 200 to $360^{\circ}C$. Varying duration of hydrothermal process led to the difference in physical characteristics of $CeO_2$ nanorods, such as aspect ratio, BET surface area, pore diameter, and pore volume. Consequently, the catalytic activities of Pt/$CeO_2$ nanorods were affected by the physical characteristics of the supports and appeared to be in the order of Pt/$CeO_2$(12) > Pt/$CeO_2$(48) > Pt/$CeO_2$(96). The comparison of the catalytic activities and results of the analysis (XPS, XRD, SEM, BET and TPR) for the supports revealed that the activity of the catalysts depends on chemical states of the Pt and the support materials in the temperature range that is lower than $280^{\circ}C$. However, the activity is rather dependent on the physical characteristic of the supports because the increased gas velocity limits the mass transfer of reactants in micropores of the supports.

Keywords

References

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