The present study reports the kinetics of self-hydrolysis of unbuffered, unstabilized concentrated NaBH4 solutions (10-20 wt %) at elevated temperatures (25-80 0C). The evolution of metaborate formation and NaBH4 consumption were measured in-situ by 11B NMR to determine the reaction kinetic parameters. The reaction order with respect to borohydride concentration is independent of NaBH4 conversion (%) and decreases with temperature, i.e., the reaction order decreases from first-order to 0.24 for an increase in temperature from 25 to 80 0C. The activation energy is found to be NaBH4 concentration dependent and increases with increase in NaBH4 conversion (%). A power law kinetic model in borohydride concentration which accounts the effect of temperature on reaction order and the effect of NaBH4 conversion (%) on activation energy has been developed to represent the self-hydrolysis rate.
 Beaird AM, Davis TA, Matthews MA. Deliquescence in the hydrolysis of sodium borohydride by
water vapor, Ind Eng Chem Res 2010;49(20):9596-9599.
 Gonçalves, A., Castro, P., Novais, A.Q., Fernandes, V., Rangel, C. and Matos, H., Dynamic
Modeling of Hydrogen Generation via Hydrolysis of Sodium Borohydride, In Proceedings of
PRES’07, 24-28 June, Ischia, Italy, (In Chemical Engineering Transactions, Vol. 12, 2007. Editor:
Jiri Klemes, AIDIC, Italy, 243.)
 Andrieux J, Demirci UB, Hannauer J, Gervais C, Goutaudier C, Miele P. Spontaneous hydrolysis of
sodium borohydride in harsh consitions. Int J Hydrogen Energy 2011;36:224-233.
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