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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Preparation of Highly Dispersed Ru/$\alpha-Al_2O_3$ Catalyst for Preferential CO Oxidation

선택적 CO 산화 반응을 위한 Ru/$\alpha-Al_2O_3$ 촉매 고분산 제조 방법에 관한 연구

  • Eom, Hyun-Ji (Dept. of Chemical Engineering, Chungnam National University) ;
  • Koo, Kee-Young (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Jung, Un-Ho (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Rhee, Young-Woo (Dept. of Chemical Engineering, Chungnam National University) ;
  • Yoon, Wang-Lai (Hydrogen Energy Research Center, Korea Institute of Energy Research)
  • 엄현지 (충남대학교 바이오 응용 공학부) ;
  • 구기영 (한국에너지기술연구원 수소에너지연구센터) ;
  • 정운호 (한국에너지기술연구원 수소에너지연구센터) ;
  • 이영우 (충남대학교 바이오 응용 공학부) ;
  • 윤왕래 (한국에너지기술연구원 수소에너지연구센터)
  • Received : 2010.09.20
  • Accepted : 2010.10.20
  • Published : 2010.10.31
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Abstract

0.5wt% Ru/$\alpha-Al_2O_3$ catalysts are prepared by deposition-precipitation method for the preferential CO oxidation In order to investigate the effect of pH on the Ru dispersion and particle size, the pH of precursor solution is adjusted to between 5.5 and 9.5. 0.5wt% Ru/$\alpha-Al_2O_3$ catalyst prepared at the pH of 6.5 has high Ru dispersion of 17.9% and small particle size of 7.7nm. In addition, 0.5wt% Ru/$\alpha-Al_2O_3$ catalyst prepared at the pH 6.5 is easily reduced at low temperatures below $150^{\circ}C$ due to high dispersion of $RuO_2$ particle and shows high CO conversion over 90% in the wide temperature range between $100^{\circ}C$ and $160^{\circ}C$. Moreover, the deposition-precipitation is a feasible method to improve the Ru dispersion as compared to the impregnation method. The 0.5wt% Ru/$\alpha-Al_2O_3$ catalyst prepared by deposition-precipitation exhibits higher CO conversion than 0.5wt% Ru/$\alpha-Al_2O_3$ catalysts prepared by impregnation due to higher metal dispersion and better reducibility at low temperature.

Keywords

References

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