Effects of SiO2 Incorporation on Catalytic Performance and Physico-Chemical Properties of Iron-Based Catalysts for the Fischer-Tropsch Synthesis

Fischer-Tropsch 합성반응용 Fe계 촉매의 성능 및 물리화학적 특성에 미치는 SiO2 첨가효과

  • Hyun, Sun-Taek (Department of Chemical and Biological Engineering, Korea University) ;
  • Chun, Dong Hyun (Clean Fossil Energy Research Center, Korea Institute of Energy Research) ;
  • Kim, Hak-Joo (Clean Fossil Energy Research Center, Korea Institute of Energy Research) ;
  • Yang, Jung Hoon (Clean Fossil Energy Research Center, Korea Institute of Energy Research) ;
  • Yang, Jung-Il (Clean Fossil Energy Research Center, Korea Institute of Energy Research) ;
  • Lee, Ho-Tae (Clean Fossil Energy Research Center, Korea Institute of Energy Research) ;
  • Lee, Kwan-Young (Department of Chemical and Biological Engineering, Korea University) ;
  • Jung, Heon (Clean Fossil Energy Research Center, Korea Institute of Energy Research)
  • 현순택 (고려대학교 화공생명공학과) ;
  • 천동현 (한국에너지기술연구원 청정화석연료연구센터) ;
  • 김학주 (한국에너지기술연구원 청정화석연료연구센터) ;
  • 양정훈 (한국에너지기술연구원 청정화석연료연구센터) ;
  • 양정일 (한국에너지기술연구원 청정화석연료연구센터) ;
  • 이호태 (한국에너지기술연구원 청정화석연료연구센터) ;
  • 이관영 (고려대학교 화공생명공학과) ;
  • 정헌 (한국에너지기술연구원 청정화석연료연구센터)
  • Received : 2009.12.14
  • Accepted : 2010.01.13
  • Published : 2010.06.30

Abstract

The FTS(Fischer-Tropsch synthesis) was carried out over precipitated iron-based catalysts with or without $SiO_2$ in a fixed-bed reactor at $250^{\circ}C$ and 1.5 MPa. The catalysts with $SiO_2$ showed much higher catalytic activity for the FTS than those without $SiO_2$, displaying excellent stability during 144 h of reaction. The X-ray diffraction and $N_2$ physisorption revealed that the catalysts with $SiO_2$ showed enhanced dispersion of $Fe_2O_3$ compared with those without $SiO_2$. Also, the results of temperature-programmed reduction by $H_2$ showed that the addition of $SiO_2$ markedly promoted the reduction of $Fe_2O_3$ into $Fe_3O_4$ and FeO at low temperatures below $260^{\circ}C$. In contrast, surface basicity of the catalysts, which was analyzed by temperature-programmed desorption of $CO_2$, decreased as a result of $SiO_2$ addition. We attribute the high and stable performance of the catalysts with $SiO_2$ to the improved dispersion and reducibility by the $SiO_2$ addition.

Keywords

Indirect Coal Liquefaction;Fischer-Tropsch Synthesis;Precipitated Iron-Based Catalyst;$SiO_2$ Incorporation

Acknowledgement

Supported by : 한국에너지기술연구원

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