A Study on Poisoning of the Reforming Catalysts on the Position of Anode in the Direct Internal Reforming Molten Carbonate Fuel Cell

직접 내부개질형 용융탄산염 연료전지의 음극판 위치에 따른 개질 촉매 피독에 관한 연구

  • Wee, Jung Ho (Department of Chemical Engineering, Korea University) ;
  • Chun, Hai Soo (Department of Chemical Engineering, Korea University)
  • 위정호 (고려대학교 화학공학과) ;
  • 전해수 (고려대학교 화학공학과)
  • Received : 1998.07.02
  • Accepted : 1999.06.04
  • Published : 1999.08.10

Abstract

The trend of poisoning of reforming catalyst along with the position of anodic catalyst bed was studied. Keeping the conditions that steam to carbon ratio was 2.5, operating voltage was 0.75 V, current density was $140mA/cm^2$, the unit cell was operated during 24 hrs at a steady state. And then the cell was stopped, the catalysts packed in the position of inlet, middle and outlet were sampled individually and then the amount of carbon, Li and K poisoned were analysed. After 100 hrs operated, the catalysts at the same positions were analysed at the same manner. The result of this experiment was as followings. After 24 hrs operated, the poisoning amounts of Li and K in the catalyst were 0.27 wt% at inlet, 0.23 wt% at middle and the highest value 1.59 wt% at outlet. After 100 hrs, the amount of poisoning is the highest in the catalyst packed at the inlet of unit cell. The performance simulation of unit cell explained these trends of poisoning catalysts. The simulation told that the catalyst in the region of the inlet of unit cell treated the 90% of initial methane flow rate and the highest electrochemical reaction happened in this region. So the catalysts of this region were the most poisoned with carbon, Li and K and also the rate of poisoning is faster than that of the catalyst at other regions. The temperature at the region of outlet of unit cell was $30^{\circ}C$ higher than that of other regions, so more Li, and K vaporized than at other regions and little reforming reaction at this region made the catalysts poisoning rate low.

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