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http://dx.doi.org/10.5229/JKES.2014.17.1.71

A Study on the Performance of Catalysts for the Recombination of Oxyhydrogen Gas Generated in Secondary Battery  

Kim, Yong-Sik (Department of Chemical engineering, Hong Ik University)
Chang, Min-Hwan (Department of Chemical engineering, Hong Ik University)
Ju, Jeh-Beck (Department of Chemical engineering, Hong Ik University)
Publication Information
Journal of the Korean Electrochemical Society / v.17, no.1, 2014 , pp. 71-77 More about this Journal
Abstract
The performance of catalysts for the recombination of oxyhydrogen gas was measured and compared with the results obtained from theoretical model. The oxyhydrogen gas was generated by the electrolysis cell and recombined through the fixed bed catalytic reactor. The yield that is the ratio of water-amount produced to the water-amount consumed in the electrolysis cell was increased with the increase of KOH concentration in electrolysis cell and the applied current. The catalyst 1 showed the best performance and the yield was under 60 %. The faradic yield calculated by Faraday's law showed about 100% in maximum with catalyst 1. The production rate of water generated by the recombination was 5-40 g/day dependent on the flow rate of mixed gas. Considering the results calculated from the pseudo-homogeneous catalytic reactor model, the hot point inside the reactor was moved to the direction of outlet and the maximum temperatures were $440-480^{\circ}K$ when the gas flow rate increased. The production rate of water calculated from the theoretical model showed good agreement with experimental results below the flow rate of $0.5cm^3/sec$, but there were much differences above that flow rate.
Keywords
VRLA; Oxyhydrogen gas; Catalysts; Recombination; Fixed bed reactor;
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