KINETICS OF CATALYTIC HYDROLYSIS OF AQUEOUS AND AQUEOUS-ALKALINE SODIUM BOROHYDRIDE SOLUTIONS

The infl uence of temperature, as well as NaOH and NaBH₄ concentrations on the rate of catalytic hydrolysis is investigated. Finely dispersed powders of platinum and ruthenium on a titanium oxide carrier were used as model catalysts. The activation energies in an aqueous and aqueous-alkaline solutions of NaBH₄, equal to 60.5 and 53.2 kJ/mole for Pt/TiO₂ and 62 and 64.65 kJ/mole for Ru/TiO₂, respectively, were determined. It was found that with an increase in the concentration of NaOH, the rate of hydrogen generation with Ru/TiO2 decreases, and with Pt/TiO₂ passes through a maximum in the range 0.5–2 M NaOH. It is shown that with traditional processing of kinetic data for determining the activation energy, its dependence on the sorption properties of the surface and the concentration of the solution is revealed.
The infl uence of temperature, as well as NaOH and NaBH₄ concentrations on the rate of catalytic hydrolysis is investigated. Finely dispersed powders of platinum and ruthenium on a titanium oxide carrier were used as model catalysts. The activation energies in an aqueous and aqueous-alkaline solutions of NaBH₄, equal to 60.5 and 53.2 kJ/mole for Pt/TiO₂ and 62 and 64.65 kJ/mole for Ru/TiO₂, respectively, were determined. It was found that with an increase in the concentration of NaOH, the rate of hydrogen generation with Ru/TiO2 decreases, and with Pt/TiO₂ passes through a maximum in the range 0.5–2 M NaOH. It is shown that with traditional processing of kinetic data for determining the activation energy, its dependence on the sorption properties of the surface and the concentration of the solution is revealed.
Author:  V. G. Minkina, S. I. Shabunya, V. I. Kalinin
Keywords:  sodium borohydride, hydrogen, catalytic hydrolysis, platinum, ruthenium
Page:  1744