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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 4, 2010
Accepted March 1, 2010

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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NaBH4수용액 저장과정 중 안정성에 관한 연구

Study on the Stability of NaBH4 Solution during Storage Process

심우종 조재영 최대기¹ 남석우¹ 박권필^†

Woojong Sim Jaeyoung Jo Daeki Choi¹ Sukwoo Nam¹ Kwonpil Park^†

순천대학교 화학공학과, 540-742 전남 순천시 매곡동 315 ¹한국과학기술연구원 연료전지센터, 136-791 서울 성북구 하월곡동 39-1

Department of Chemical Engineering, Sunchon National University, 315 Maegok-dong, Suncheon-si, Jeonnam 540-742, Korea ¹Fuel Cell Research Center, Korea Institute of Science and Technology, 39-1 Hawolkok-dong, Seongbuk-gu, Seoul 136-791, Korea

parkkp@sunchon.ac.kr

Korean Chemical Engineering Research, June 2010, 48(3), 322-326(5), NONE Epub 5 July 2010

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Abstract

수소발생용으로 사용되는 NaBH4 수용액의 저장과정 중에 NaBH4 안정성에 대해 연구하였다. NaBH4의 안정성을 증가시키기 위해 NaOH와 KOH를 사용하였으며, NaBH4의 저장 중 가수분해반응에 미치는 알칼리와 NaBH4 농도, 온도 그리고 저장 용기 재질의 영향을 실험하였다. 알칼리농도가 증가할수록 NaBH4가 수용액 중에서 안정화되기 때문에 수소발생 속도가 감소하였다. NaBH4 농도를 10에서 15 wt%로 증가시켰을 때 안정성이 감소하다 15 wt% 이상으로 농도를 증가시켰을 때는 pH의 증가에 의해 안정성이 증가하였다. NaBH4 농도를 25 wt%, NaOH 3.0 wt%일 때 수소발생 활성화 에너지 값은 115.1 kJ/mol 로 촉매를 사용했을 때보다 활성화 에너지 값이 1.5~4.0배 높았다. 유리나 스텐리스ㅡ스틸에 저장된 NaBH4 용액의 안정성이 플라스틱에 저장된 NaBH4 용액의 안정성보다 더 높았다.

Stability of sodium borohydride solution during storage was studied. In order to enhance the NaBH4 stability, NaOH and KOH were added to the NaBH4 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 NaBH4 stability in the solution. The stability of NaBH4 solution decreased when the borohydride concentration raised from 10 to 15 wt% and then increased when the NaBH4 concentration increased above 15 wt% due to increase in the pH of the concentrated solution. The activity coefficient of hydrolysis of NaBH4 solution(NaOH 3.0 wt%, NaBH4 25 wt%) was 115.1 kJ/mol and this value was 1.5~4.0 times higher than that of hydrolysis of NaBH4 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

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