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Understanding oscillatory phenomena in molecular hydrogen generation via sodium borohydride hydrolysis

Budroni, Marcello Antonio and Biosa, Emiliano and Garroni, Sebastiano and Mulas, Gabriele Raimondo Celestino and Marchettini, Nadia and Culeddu, Nicola and Rustici, Mauro (2013) Understanding oscillatory phenomena in molecular hydrogen generation via sodium borohydride hydrolysis. Physical Chemistry Chemical Physics, Vol. 15 (42), p. 18664-18670. ISSN 1463-9076. eISSN 1463-9084. Article.

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DOI: 10.1039/C3CP53302F

Abstract

The hydrolysis of borohydride salts represents one of the most promising processes for the generation of high purity molecular hydrogen under mild conditions. In this work we show that the sodium borohydride hydrolysis exhibits a fingerprinting periodic oscillatory transient in the hydrogen flow over a wide range of experimental conditions. We disproved the possibility that flow oscillations are driven by supersaturation phenomena of gaseous bubbles in the reactive mixture or by a nonlinear thermal feedback according to a thermokinetic model. Our experimental results indicate that the NaBH4 hydrolysis is a spontaneous inorganic oscillator, in which the hydrogen flow oscillations are coupled to an "oscillophor" in the reactive solution. The discovery of this original oscillator paves the way for a new class of chemical oscillators, with fundamental implications not only for testing the general theory on oscillations, but also with a view to chemical control of borohydride systems used as a source of hydrogen based green fuel.

Item Type:Article
ID Code:10069
Status:Published
Refereed:Yes
Uncontrolled Keywords:Chemical oscillation, borohydride, hydrogen
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Chimica e Farmacia
Publisher:Royal Society of Chemistry
ISSN:1463-9076
eISSN:1463-9084
Deposited On:03 Sep 2014 15:38

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