Abstract
A novel circulation type a hydrogen generator operating on sodium borohydride – sodium borate solution has been developed. The major parameters, such as operation temperature, concentration of the sodium borohydride and metaborate, catalytic activity, start up conditions, and removal of NaBO2 as a product of the sodium borohydride hydrolysis have been analyzed. Generation of hydrogen was evaluated for aqueous NaBH4 solutions in the range of 15–23 wt. % NaBH4 in presence of the alumina supported Pt, Pd, Rh and Ni catalysts. The main trends in hydrogen gas generation with respect to the solution temperature and pressure in the reactor were analyzed. The catalytic efficiency and the rate of the hydrogen gas generation (1.5 Nm3/h) at the average hydrogen yield of 97–98.5% is sufficient for operation of the PEMFC Nexa™ Power module from Ballard.
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