Study on the Stability of NaBH4 Solution during Storage Process

NaBH4수용액 저장과정 중 안정성에 관한 연구

  • Sim, Woojong (Department of Chemical Engineering, Sunchon National University) ;
  • Jo, Jaeyoung (Department of Chemical Engineering, Sunchon National University) ;
  • 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)
  • 심우종 (순천대학교 화학공학과) ;
  • 조재영 (순천대학교 화학공학과) ;
  • 최대기 (한국과학기술연구원 연료전지센터) ;
  • 남석우 (한국과학기술연구원 연료전지센터) ;
  • 박권필 (순천대학교 화학공학과)
  • Received : 2010.02.04
  • Accepted : 2010.03.01
  • Published : 2010.06.30

Abstract

Stability of sodium borohydride solution during storage was studied. In order to enhance the $NaBH_4$ stability, NaOH and KOH were added to the $NaBH_4$ solution. The effect of concentration of the borohydride and alkaline solution, temperature and materials of storage vessels on the rate of borohydride hydrolysis was investigated. The rate of hydrogen evolution decreased as the concentration of alkaline increased due to increase of $NaBH_4$ stability in the solution. The stability of $NaBH_4$ solution decreased when the borohydride concentration raised from 10 to 15 wt% and then increased when the $NaBH_4$ concentration increased above 15 wt% due to increase in the pH of the concentrated solution. The activity coefficient of hydrolysis of $NaBH_4$ solution(NaOH 3.0 wt%, $NaBH_4$ 25 wt%) was 115.1 kJ/mol and this value was 1.5~4.0 times higher than that of hydrolysis of $NaBH_4$ solution with catalyst. The borohydride solutions in glass and stainless-steel vessel were more stable than the solution in plastic(PE) vessel.

Keywords

Sodium Borohydride;Stability;Hydrogen Generation;NaOH;Hydrolysis;Fuel Cell

Acknowledgement

Supported by : 교육과학기술부

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