Open Access
JEEP 2009
Article Number 00023
Number of page(s) 6
Published online 04 December 2009
JEEP 2009, 00023 (2009)
DOI: 10.1051/jeep/200900023

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

O. Krol, J. Andrieux, J.J. Counioux, R. Tenu and C. Goutaudier

Université de Lyon – Université Claude Bernard Lyon 1 Laboratoire Multimatériaux et Interfaces – UMR CNRS 5615 43, bd 11 novembre – 69622 Villeurbanne Cedex France

Published online: 4 December 2009

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.

Key words: Potassium metaborate -- solubility in water -- phase diagram

© Owned by the authors, published by EDP Sciences 2009