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http://dx.doi.org/10.7316/KHNES.2013.24.1.001

Effect of Additives for Prevention of NaBO2 Precipitation on Hydrogen Generation Properties of NaBH4 Hydrolysis  

Oh, Taekyun (Division of Aerospace Engineering, School of Mechanical, Aerospace and Systems Engineering, KAIST)
Kwon, Sejin (Division of Aerospace Engineering, School of Mechanical, Aerospace and Systems Engineering, KAIST)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.24, no.1, 2013 , pp. 1-11 More about this Journal
Abstract
Additives such as glycerol, methanol, acetone, and ethanol were used to prevent $NaBO_2$ from precipitation, and their effects on hydrogen generation properties of $NaBH_4$ hydrolysis were investigated. When the concentration of additives was 5 wt%, the additives such as methanol, acetone, and ethanol could not prevent $NaBO_2$ precipitation. Although glycerol prevented $NaBO_2$ precipitation, conversion efficiency decreased to 78.0% due to its viscosity. Based on test results, hydrogen generation tests were also performed at various concentration of glycerol and methanol to investigate the concentration effects on hydrogen generation properties. As the concentration of glycerol increased from 1 wt% to 3 wt%, conversion efficiency increased owing to additive effect. When its concentration increased to 5 wt%, conversion efficiency decreased due to its viscosity. As the concentration of methanol increased from 5 wt% to 10 wt%, conversion efficiency increased owing to additive effect. When its concentration increased to 15 wt%, conversion efficiency decreased due to $NaB(OCH_3)_4$ precipitate. Although conversion efficiency decreased about 1% when 3 wt% glycerol was added, $NaBO_2$ precipitation was prevented. Consequently, addition of 3 wt% glycerol to $NaBH_4$ solution improves stability of hydrogen generation system.
Keywords
$NaBH_4$ hydrolysis; $NaBO_2$ precipitation; Co-P/Ni foam catalyst; Additive;
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