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Received August 4, 2014
Accepted September 4, 2014
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비담지 Co-B, Co-P-B 촉매를 이용한 NaBH4 가수분해 반응
Hydrolysis Reaction of NaBH4 using Unsupported Co-B, Co-P-B Catalyst
순천대학교 화학공학과, 540-742 전남 순천시 매곡동 315 1(주)CNL Energy, 540-742 전남 순천시 매곡동 315
Department of Chemical Engineering, Sunchon National University, 315 Maegok-dong, Suncheon, Jeonnam 540-742, Korea 1CNL Energy Co, 315 Maegok-dong, Suncheon, Jeonnam 540-742, Korea
parkkp@sunchon.ac.kr
Korean Chemical Engineering Research, February 2015, 53(1), 11-15(5), 10.9713/kcer.2015.53.1.11 Epub 3 February 2015
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Abstract
휴대용 고분자전해질 연료전지의 수소발생용으로써 NaBH4는 많은 장점을 갖고 있다. 본 연구에서는 비담지 Co-B, Co-P-B 촉매의 NaBH4 가수분해 특성에 대해 연구하였다. 촉매의 BET 표면적, 수소 수율, NaBH4 농도 영향, 촉매 내 구성 등을 실험하였다. 비담지 Co-B 촉매의 BET 표면적은 75.7 m2/g으로 FeCrAlloy에 담지한 Co-B 촉매에 비해 BET 면적이 18배 높았다. 회분식 반응기에서 비담지 촉매들은 NaBH4 20~25 wt% 사용조건에서 97.6~98.5%의 높은 수소수율을 보였다. NaBH4 농도가 30 wt%로 증가하면서 수소수율은 95.3~97.0%로 감소하였다. 비담지 촉매의 촉매 손실율은 FeCrAlloy에 담지 촉매에 비해 낮았으며, NaBH4 농도가 증가하면서 촉매 손실율도 증가하였다. 연속 반응기에서 1.2 g 비담지 Co-P-B 촉매를 사용해서 약 3ℓ/min 발생속도로 가수분해 반응하여 90%의 수소 수율을 얻었다.
Sodium borohydride, NaBH4, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells(PEMFCs). Properties of NaBH4 hydrolysis reaction using unsupported Co-B, Co-P-B catalyst were studied. BET surface area of catalyst, yield of hydrogen, effect of NaBH4 concentration and durability of catalyst were measured. The BET surface area of unsupported Co-B catalyst was 75.7 m2/g and this value was 18 times higher than that of FeCrAlloy supported Co-B catalyst. The hydrogen yield of NaBH4 hydrolysis reaction by unsupported catalysts using 20~25 wt% NaBH4 solution was 97.6~98.5% in batch reactor. The hydrogen yield decrease to 95.3~97.0% as the concentration of NaBH4 solution increase to 30 wt%. The loss of unsupported catalyst was less than that of FeCrAlloy supported catalyst during NaBH4 hydrolysis reaction and the loss increased with increasing of NaBH4 concentration. In_x000D_
continuous reactor, hydrogen yield of NaBH4 hydrolysis was 90% using 1.2 g of unsupported Co-P-B catalyst with 3ℓ/min hydrogen generation rate.
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