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황병찬 ( Byung Chan Hwang ),조재영 ( Jae Young Jo ),신석재 ( Suk Jae Sin ),최대기 ( Dae Ki Choi ),남석우 ( Suk Woo Nam ),박권필 ( Kwon Pil Park ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.5
Sodium borohydride, NaBH4, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells (PEMFCs). The hydrogen yield of sodium borohydride hydrolysis reaction was studied. The effect of temperature, NaBH4 concentration, NaOH concentration and catalyst type on the hydrogen yield from NaBH4 hydrolysis reaction were measured. The catalysts of Co-P/Cu, Co-B/Cu and Co-P-B/Cu were used in this study and there was no different effect of these catalysts on the hydrogen yield from NaBH4. Under the temperature of 60 ˚C, the hydrogen yield decreased as NaBH4 concentration increased due to formation of gel with by-products and reactants. The gel formed during NaBH4 hydrolysis reaction diminished the hydrogen evolution rate and total volume of hydrogen. Addition of NaOH stabilizer enhanced the formation of gel and then decreased the hydrogen yield.
Co-P-B/FeCrAlloy 촉매를 이용한 NaBH_4 가수분해 반응
박권필 ( Kwon Pil Park ),황병찬 ( Byung Chan Hwang ),조아라 ( A Ra Jo ),신석재 ( Suk Jae Sin ),최대기 ( Dae Ki Choi ),남석우 ( Suk Woo Nam ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
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 1000℃ 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℃.
황병찬 ( Byung Chan Hwang ),조아라 ( A Ra Jo ),신석재 ( Suk Jae Sin ),최대기 ( Dae Ki Choi ),남석우 ( Suk Woo Nam ),박권필 ( Kwon Pil Park ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Sodium borohydride, NaBH4, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells (PEMFCs), The durability of Co-P-B/Cu catalyst for sodium borohydride hydrolysis reaction was studied, The effect of reaction temperature, NaBH4 concentration, NaOH concentration and calcination temperature of catalyst on the durability of Co-P-B/Cu catalyst were measured, The gel formed during hydrolysis reaction affected the durability of catalyst (loss of catalyst), Formation of gel increased the loss of the catalyst. When NaBH4 concentration was high and reaction temperature was higher than 60˚C, loss of catalyst was low because gel was not formed. But under the temperature of 40˚C, loss of catalyst increased due to gel formation When NaBH4 concentration was 40 weight % and the reaction temperature was 40˚C, the loss of catalyst increased as the NaOH concentration increased. As the calcination temperature of catalyst decreased, the loss of catalyst decreased and the activity of catalyst decreased. Calcination of the catalyst at high temperature enhanced the durability of catalyst but diminished the activity of catalyst.