Long-Term Stability of Hydrogen Production from Sodium Borohydride Hydrolysis
Abstract:
The objective of this paper is to generate hydrogen from the NaBH4 hydrolysis reaction using a nickel acetate catalyst, in both the presence and absence of NaOH. The concentration of sodium borohydride system (NaBH4 ) has a significant impact on the degree of hydrolysis, as it has been discovered. As the amount of NaBH4 increased from 0.16 moles to 0.32 moles, hydrogen production activity showed a gradual increase. Specifically, the production of hydrogen from the reaction was 13.11 L for 0.16 moles NaBH4 , 24.0 L for 0.24 moles of NaBH4 and 35.86 L for 0.32 moles of NaBH4 over a period of 15 minutes. It is noted that the rate of hydrogen generation (HGR) improves as the amount of NaBH₄ increases, reaching a peak at 0.32 moles. Thus, the results showed a hydrogen generation rate of 1311 ml min-1g-1 for 0.16 moles of NaBH4 , 1770.0 ml min-1g-1 for 0.24 moles of NaBH4 and 1990.0 ml min-1g-1 for 0.32 moles of NaBH4 . It was found that the presence of NaOH prolongs the reaction time, so the amount of NaOH decreases, the reaction time decreases and (from 92 minutes for a NaBH4 : NaOH ratio of 1:1, while for a NaBH4 : NaOH ratio of 35:1 the reaction time was 21 minutes). Hydrogen production was 19.2 and 26.04 L when the ratio was 10:1, while 17.0 and 18.37 L were produced when the ratio was 7:1. The hydrogen generation rate (HGR) for 6% NaBH4 was found to be 347.8 ml min-1g-1, 413.33 ml min-1g-1 for 9% NaBH4 , 352.2, 798.7, and 809.5 ml min-1g-1 for 7% NaBH4 , and 352.2, 798.7, and 809.5 ml min-1g-1 for 7% NaBH4.
