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Kinetic modeling of self-hydrolysis of aqueous NaBH4 solutions by model-based isoconversional method
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Orientador(es)
Resumo(s)
The present work reports the kinetic modeling of self-hydrolysis of non-buffered, nonstabilized NaBH4 solutions by model-based isoconversional method. The overall kinetics is described by a ‘reaction-order’ model in a practical operating window of 10-20 wt% NaBH4 solutions at 25-80 ºC and 0-50% conversions. The apparent activation energy and preexponential factor are interrelated through a kinetic compensation effect (KCE). The apparent reaction order remains constant at a given temperature irrespective of extent of conversion and decreases with increase in temperature. It decreases from first-order to 0.26 with increase in temperature from 25 to 80 ºC.
Descrição
Palavras-chave
Hydrogen production Isoconversional method Kinetics Self-hydrolysis Sodium borohydride
Contexto Educativo
Citação
Retnamma, R.; Novais, A.Q.; Rangel, C.M.; Yu, L.; Matthews, M.A. - Kinetic modeling of self-hydrolysis of aqueous NaBH4 solutions by model-based isoconversional method. In: International Journal of Hydrogen Energy, 2014, Vol. 39, p. 6567-6576