Solubility and related equilibria in the KBO2-H2O and KBO2-H2O-KOH systems

Abstract : Potassium borohydride KBH4 is an attractive chemical hydride for H2 generation and storage in portable fuel cell applications. Nevertheless, the control of the by-products, in terms of stability and solubility in aqueous solutions, is one of the limiting steps of the hydrolysis reaction of H2 release. We report here some physicochemical properties of concentrated KBO2 aqueous solutions: solubility and gravimetric density are measured as function of temperature between 10 to 80°C. The stability of hydrated metaborates KBO2.xH2O solid phases (with x = 4/3 and 4) in alkaline aqueous solutions is also evaluated at 20°C.
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Communication dans un congrès
35th Conference on Phase Equilibria (JEEP'09 ), Apr 2009, Annecy, France
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Olesia Krol, Jerome Andrieux, Jean-Jacques Counioux, Richard Tenu, Christelle Goutaudier. Solubility and related equilibria in the KBO2-H2O and KBO2-H2O-KOH systems. 35th Conference on Phase Equilibria (JEEP'09 ), Apr 2009, Annecy, France. 〈hal-01611551〉

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