Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Hydrolysis Reaction of NaBH4 Using Activated Cabon Supported Co-B/C, Co-P-B/C Catalyst

활성탄 담지 Co-B/C, Co-P-B/C 촉매를 이용한 NaBH4 가수분해 반응

  • Oh, Sohyeong (Department of Chemical Engineering, Sunchon National University) ;
  • Kim, Youkyum (Department of Chemical Engineering, Sunchon National University) ;
  • Bae, Hyojune (Department of Chemical Engineering, Sunchon National University) ;
  • Kim, Dongho (Department of Chemical Engineering, Sunchon National University) ;
  • Byun, Younghwan (Department of Chemical Engineering, Sunchon National University) ;
  • Ahn, Ho-Geun (Department of Chemical Engineering, Sunchon National University) ;
  • Park, Kwon-Pil (Department of Chemical Engineering, Sunchon National University)
  • Received : 2018.08.09
  • Accepted : 2018.09.12
  • Published : 2018.10.01
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Abstract

Sodium borohydride, $NaBH_4$, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells (PEMFCs). Properties of $NaBH_4$ hydrolysis reaction using activated carbon supported Co-B/C, Co-P-B/C catalyst were studied. BET surface area of catalyst, yield of hydrogen, effect of $NaBH_4$ concentration and durability of catalyst were measured. The BET surface area of carbon supported catalyst was over $500m^2/g$ and this value was 2~3 times higher than that of unsupported catalyst. Hydrogen generation of activated carbon supported catalyst was more stable than that of unsupported catalyst. The activation energy of Co-P-B/C catalyst was 59.4 kJ/mol in 20 wt% $NaBH_4$ and 14% lower than that of Co-P-B/FeCrAlloy catalyst. Catalyst loss on activated carbon supported catalyst was reduced to about 1/3~1/2 compared with unsupported catalyst, therefore durability was improved by supporting catalyst on activated carbon.

휴대용 고분자전해질 연료전지의 수소발생용으로써 $NaBH_4$는 많은 장점을 갖고 있다. 본 연구에서는 활성탄 담지 Co-B/C, Co-P-B/C 촉매의 $NaBH_4$ 가수분해 특성에 대해 연구하였다. 촉매의 BET 표면적, 수소 수율, $NaBH_4$ 농도 영향, 촉매 내구성 등을 실험하였다. 활성탄에 담지시킴으로써 BET 면적이 비담지 촉매에 비해 2~3배 증가해 $500m^2/g$ 이상이 되었다. 활성탄 담지 촉매의 수소발생이 비담지 촉매보다 더 안정적이었다. 20 wt% $NaBH_4$에서 활성화 에너지가 59.4 kJ/mol로 Co-P-B/FeCrAlloy 촉매 보다 14% 낮았다. 활성탄 담지 촉매가 비담지 촉매에 비해 촉매 손실이 1/3~1/2로 감소해 활성탄에 촉매를 담지시킴으로써 내구성을 향상시킬 수 있었다.

Keywords

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