Deliquescence in the Hydrolysis of Sodium Borohydride by Water Vapor

The interaction between sodium borohydride (NaBH4) and water vapor leading to hydrolysis and hydrogen generation has been investigated by a visual technique. In situ video monitoring confirms that reaction is preceded by deliquescence of NaBH4 upon exposure to water vapor, forming a viscous liquid s...

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Bibliographic Details
Published inIndustrial & engineering chemistry research Vol. 49; no. 20; pp. 9596 - 9599
Main Authors Beaird, Amy M, Davis, Thomas A, Matthews, Michael A
Format Journal Article
LanguageEnglish
Published Washington, DC American Chemical Society 20.10.2010
Subjects
Applied Chemistry
Applied sciences
Chemical engineering
Exact sciences and technology
Hydrolysis
Water vapor
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Summary:The interaction between sodium borohydride (NaBH4) and water vapor leading to hydrolysis and hydrogen generation has been investigated by a visual technique. In situ video monitoring confirms that reaction is preceded by deliquescence of NaBH4 upon exposure to water vapor, forming a viscous liquid solution that releases hydrogen. A regime of temperature and relative humidity under which the deliquescence is favorable has been determined. A relative humidity threshold exists below which NaBH4 powder does not absorb water vapor into the bulk to form a solution and thereby does not undergo reaction to form hydrogen. The deliquescence behavior of NaBH4 in water vapor provides an alternative reaction pathway that has potential to improve hydrogen storage density by reducing excess water and other additives.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie100244v