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

被引：12
|
作者：
Krol, O. [1 ]
Andrieux, J. [1 ]
Counioux, J. J. [1 ]
Tenu, R. [1 ]
Goutaudier, C. [1 ]
机构：
[1] Univ Lyon 1, Univ Lyon, Lab Multimat & Interfaces, CNRS,UMR 5615, F-69622 Villeurbanne, France
来源：
XXXV JEEP - 35TH CONFERENCE ON PHASE EQUILIBRIA | 2009年
关键词：
Potassium metaborate; solubility in water; phase diagram;
D O I：
10.1051/jeep/200900023
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Potassium borohydride KBH(4) is an attractive chemical hydride for H(2) 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 H(2) release. We report here some physicochemical properties of concentrated KBO(2) aqueous solutions: solubility and gravimetric density are measured as function of temperature between 10 to 80 degrees C. The stability of hydrated metaborates KBO(2)center dot xH(2)O solid phases (with x = 4/3 and 4) in alkaline aqueous solutions is also evaluated at 20 degrees C.
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页数：6
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