THERMOCHEMICAL PRODUCTION OF SODIUM BOROHYDRIDE FROM SODIUM METABORATE IN A SCALED-UP REACTOR

Title
THERMOCHEMICAL PRODUCTION OF SODIUM BOROHYDRIDE FROM SODIUM METABORATE IN A SCALED-UP REACTOR
Authors
엄광섭조은애김민중오세권남석우권혁상
Keywords
sodium borohydride; sodium metaborate; hydrogen storage and production; recycling process; thermochemical conditions
Issue Date
2012-06
Publisher
International Conference on Hydrogen Production (ICH2P)
Citation
, 135-135
Abstract
Sodium borohydride (NaBH4) is a safe and practical hydrogen storage material for on-board hydrogen production. However, a significant obstacle in its practical use on-board hydrogen production system is its high cost. Hence, the reproduction of NaBH4 from byproducts that precipitateafter hydrolysis is an important strategy to make its use more cost effective. In this work, we focused on the optimization of thermochemical NaBH4 reproduction reaction in a large-scaled reactor (~ 100 ml), and weinvestigated the effects of thereaction temperature(400-600 °C) and H2 pressure (30-60 bar) on the NaBH4 conversion yield using Mg as a reducing agent. The conversion yield of NaBO2 to NaBH4increased with an increasein H2 pressure to 55 bar and then decreased slightly at 60 bar. The yield increased with an increase in the reactor temperature from 400 to 600 °C.The maximum yieldwas 69 % at 55 bar and 600°C using homogenized reactants by ballmilling for 1 h under an Ar atmosphere. Though Ca as a reducing agent makes the thermochemical reproduction reaction more favorable, the NaBH4yield was lowafter 1 h of production at 55 bar and 600 °C. This result may be due to the fact that Ca is not as effective as Mg in catalyzing the conversion of hydrogen gas to protide (H-), which can substitute oxygen actively in NaBO2.
URI
http://pubs.kist.re.kr/handle/201004/43392
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KIST Publication > Conference Paper
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