Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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NaBH4 Hydrolysis Reaction Using Co-P-B Catalyst Supported on FeCrAlloy

Co-P-B/FeCrAlloy 촉매를 이용한 NaBH4 가수분해 반응

  • Hwang, Byungchan (Department of Chemical Engineering, Sunchon National University) ;
  • Jo, Ara (Department of Chemical Engineering, Sunchon National University) ;
  • Sin, Sukjae (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Choi, Daeki (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Nam, Sukwoo (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Park, Kwonpil (Department of Chemical Engineering, Sunchon National University)
  • 황병찬 (순천대학교 화학공학과) ;
  • 조아라 (순천대학교 화학공학과) ;
  • 신석재 (한국과학기술연구원 연료전지센터) ;
  • 최대기 (한국과학기술연구원 연료전지센터) ;
  • 남석우 (한국과학기술연구원 연료전지센터) ;
  • 박권필 (순천대학교 화학공학과)
  • Received : 2012.07.20
  • Accepted : 2012.08.24
  • Published : 2013.02.01
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Abstract

Properties of $NaBH_4$ hydrolysis reaction using Co-P-B/FeCrAlloy catalyst and the catalyst durability were studied. Co-P-B/FeCrAlloy catalyst showed low activation energy such as 25.2 kJ/mol in 5 wt% $NaBH_4$ solution, which was similar that of noble metal catalyst. The activation energy increased as the $NaBH_4$ concentration increased. Formation of gel at high concentration of $NaBH_4$ seriously affected hydrogen evolution rate and the catalyst durability. The catalyst loss decreased as reaction temperature increased due to lower gel formation when the concentration of $NaBH_4$ was over 20 wt%. Considering hydrogen generation rate and durability of catalyst, the catalyst supported with FeCrAlloy heat-treated at $1,000^{\circ}C$ without ultra vibration during dipping and calcination after catalyst dipping was best catalyst. To use catalyst more than three times in 25 wt% $NaBH_4$ solution, it should be reacted at higher temperature than $60^{\circ}C$.

Co-P-B/FeCrAlloy 촉매의 $NaBH_4$ 가수분해 특성과 내구성에 대해 연구하였다. 5 wt% $NaBH_4$ 농도에서 활성화 에너지가 25.2 kJ/mol로 귀금속 촉매와 비슷했고, $NaBH_4$ 농도가 증가할수록 활성화 에너지가 증가하였다. 20 wt% 이상의 $NaBH_4$ 농도에서 겔 형성이 수소발생과 촉매 내구성에 많은 영향을 줬다. $NaBH_4$ 농도가 높을 때 반응온도가 높을수록 겔 형성이 안 되므로 촉매 손실률이 낮았다. 수소발생과 촉매 내구성을 모두 고려했을 때 담지체를 $1,000^{\circ}C$에서 열처리하고, 초음파 진동없이 촉매를 담지하고, 촉매 담지 후 소성한 촉매가 우수하였다. 25 wt% $NaBH_4$에서는 촉매를 3회 이상 재사용하기 위해서는 $60^{\circ}C$ 이상의 온도에서 반응시켜야 함을 보였다.

Keywords

References

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