Abstract
휴대용 고분자전해질 연료전지의 수소발생용으로써 <TEX>$NaBH_4$</TEX>는 많은 장점을 갖고 있다. 본 연구에서는 고농도 <TEX>$NaBH_4$</TEX> 용액에서 비담지 Co-P-B, Co-B 촉매의 <TEX>$NaBH_4$</TEX> 가수분해 특성에 대해 연구하였다. 고농도에서 수소 발생 수율을 높이기 위해 <TEX>$NaBH_4$</TEX> 가수분해 반응의 수소 발생 수율에 미치는 촉매 형태, <TEX>$NaBH_4$</TEX> 농도, 응축수 회수 등의 영향에 대해 실험하였다. Co-P-B 제조과정에서 붕소의 비가 높아질수록 수소 발생 수율이 증가하였다. Co-P:B = 1:5 촉매를 사용해 <TEX>$NaBH_4$</TEX> 수용액 농도를 20 wt%에서 25 wt%로 증가시켰을 때 수소 발생 수율이 감소하였다. Co-P-B와 Co-B 촉매를 같이 사용한 반응기에서 촉매 팩의 두께를 감소시키고 응축수를 회수하여, <TEX>$NaBH_4$</TEX> 25 wt% 수용액으로 최고 수소 발생수율 96.4%를 얻었다. Sodium borohydride, <TEX>$NaBH_4$</TEX>, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells (PEMFCs). Properties of <TEX>$NaBH_4$</TEX> hydrolysis reaction using unsupported Co-P-B Co-B, catalyst at high concentration <TEX>$NaBH_4$</TEX> solution were studied. In order to enhance the hydrogen generation yield at high concentration of <TEX>$NaBH_4$</TEX>, the effect of catalyst type, <TEX>$NaBH_4$</TEX> concentration and recovery of condensing water on the hydrogen yield were measured. The yield of hydrogen evolution increased as the boron ratio increased in preparation process of Co-P-B catalyst. The hydrogen yield decreased as the concentration increased from 20 wt% to 25 wt% in <TEX>$NaBH_4$</TEX> solution during hydrolysis reaction using 1:5 Co-P-B catalyst. Maximum hydrogen yield of 96.4% obtained by recovery of condensing water and thinning of catalyst pack thickness in reactor using Co-P-B with Co-B catalyst and 25 wt% <TEX>$NaBH_4$</TEX> solution.
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