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Effects of Cu and K Addition on Catalytic Activity for Fe-based Fischer-Tropsch Reaction

Fe계 Fischer-Tropsch 반응에서 촉매활성에 대한 Cu와 K의 첨가 효과

Lee, Chan Yong;Kim, Eui Yong
이찬용;김의용

  • Received : 2018.12.28
  • Accepted : 2019.03.01
  • Published : 2019.03.30

Abstract

Effects of the Cu and K addition and the reduction condition of Fe-based catalysts for Fischer-Tropsch reaction are studied in a continuous flow reactor in this research. The catalysts for the reaction were prepared by homogeneous precipitation followed by incipient wetness impregnation. Physicochemical properties of the $Al_2O_3$ supported Fe-based catalysts are characterized by various methods including X-ray diffraction (XRD), temperature programmed reduction (TPR), and scanning electron microscopy (SEM). Catalytic activities and stabilities of the Fe/Cu/K catalyst are investigated in time-on-stream for an extended reaction time over 216 h. It is found that a reduction of the catalysts using a mixture of CO and $H_2$ can promote their catalytic activities, attributed to the iron carbides formed on the catalysts surface by X-ray diffraction analysis. The addition of Cu induces a fast stabilization of the reaction reducing the time to reach at the steady state by enhancement of catalytic reduction. The addition of K to the catalysts increases the CO conversion, while the physical stability of catalyst decreases with potassium loading up to 5%. The Fe/Cu (5%)/K (1%) catalyst shows an enhanced long term stability for the Fischer-Tropsch reaction under the practical reaction condition, displaying about 15% decrease in the CO conversion after 120 h of the operation.

Keywords

Fe catalyst;Fischer-Tropsch reaction;Reduction;Cu;K

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Acknowledgement

Supported by : 서울시립대학교