Poisoning of the Ni/MgO Catalyst by Alkali Carbonates in a DIR-MCFC

용융탄산염 연료전지에서 알칼리 탄산염에 의한 Ni/MgO 촉매의 피독

  • Moon, Hyeung-Dae (School of Chemical Engineering, Seoul National University) ;
  • Kim, Joon-Hee (School of Chemical Engineering, Seoul National University) ;
  • Ha, Heung Yong (Battery and Fuel Cell Research Center, KIST) ;
  • Lim, Tae-Hoon (Battery and Fuel Cell Research Center, KIST) ;
  • Hong, Sung-Ahn (Battery and Fuel Cell Research Center, KIST) ;
  • Lee, Ho-In (School of Chemical Engineering, Seoul National University)
  • 문형대 (서울대학교 응용화학부) ;
  • 김준희 (서울대학교 응용화학부) ;
  • 하흥용 (한국과학기술연구원 전지.연료전지센터) ;
  • 임태훈 (한국과학기술연구원 전지.연료전지센터) ;
  • 홍성안 (한국과학기술연구원 전지.연료전지센터) ;
  • 이호인 (서울대학교 응용화학부)
  • Received : 1999.05.13
  • Accepted : 1999.06.11
  • Published : 1999.08.10

Abstract

The properties of the catalyst for a direct internal reforming type molten carbonate fuel cell were examined by ICP, BET, CHN, EDS, and $H_2$ chemisorption. Potassium and lithium, the components of carbonate electrolyte, were transported to the catalyst during the operation of fuel cell, and the amounts of the deposited alkali elements were reduced in the order of inlet, outlet, and the middle. From the direct correlation between the amount of alkali and the physical properties such as BET surface area and Ni dispersion, and from the observation of the lump of the alkali species on the poisoned catalyst, it was confirmed that the physical blocking of the catalyst by alkali deposition was the main reason for the deactivation. Although the amount of alkali species was greater at the inlet than at the oulet, the catalyst sampled from the outlet had lower activity. This was caused by the chemical interaction between the alkali species and the catalyst at the outlet where temperature was highest in the cell body, which was detected by FT-IR analyses.

Acknowledgement

Supported by : 통상산업부

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