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 met...
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℃.