http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
활성탄 담지 Co-B/C, Co-P-B/C 촉매를 이용한 NaBH<sub>4</sub> 가수분해 반응
오소형 ( Sohyeong Oh ),김유겸 ( Youkyum Kim ),배효준 ( Hyojune Bae ),김동호 ( Dongho Kim ),변영환 ( Younghwan Byun ),안호근 ( Ho-geun Ahn ),박권필 ( Kwon-pil Park ) 한국화학공학회 2018 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.56 No.5
휴대용 고분자전해질 연료전지의 수소발생용으로써 NaBH4는 많은 장점을 갖고 있다. 본 연구에서는 활성탄 담지 Co-B/C, Co-P-B/C 촉매의 NaBH<sub>4</sub> 가수분해 특성에 대해 연구하였다. 촉매의 BET 표면적, 수소 수율, NaBH<sub>4</sub> 농도 영향, 촉매 내구성 등을 실험하였다. 활성탄에 담지시킴으로써 BET 면적이 비담지 촉매에 비해 2~3배 증가해 500 m<sup>2</sup>/g 이상이 되었다. 활성탄 담지 촉매의 수소발생이 비담지 촉매보다 더 안정적이었다. 20 wt% NaBH<sub>4</sub>에서 활성화 에너지가 59.4 kJ/mol로 Co-P-B/FeCrAlloy 촉매 보다 14% 낮았다. 활성탄 담지 촉매가 비담지 촉매에 비해 촉매 손실이 1/3~1/2로 감소해 활성탄에 촉매를 담지시킴으로써 내구성을 향상시킬 수 있었다. Sodium borohydride, NaBH<sub>4</sub>, shows a number of advantages as hydrogen source for portable proton exchange membrane fuel cells (PEMFCs). Properties of NaBH4 hydrolysis reaction using activated carbon supported Co-B/C, Co-P-B/C catalyst were studied. BET surface area of catalyst, yield of hydrogen, effect of NaBH<sub>4</sub> concentration and durability of catalyst were measured. The BET surface area of carbon supported catalyst was over 500 m<sup>2</sup>/g and this value was 2~3 times higher than that of unsupported catalyst. Hydrogen generation of activated carbon supported catalyst was more stable than that of unsupported catalyst. The activation energy of Co-P-B/C catalyst was 59.4 kJ/mol in 20 wt% NaBH<sub>4</sub> and 14% lower than that of Co-P-B/FeCrAlloy catalyst. Catalyst loss on activated carbon supported catalyst was reduced to about 1/3~1/2 compared with unsupported catalyst, therefore durability was improved by supporting catalyst on activated carbon.
회귀분석을 이용한 이륜자동차 디스크 마모량에 미치는 마찰조건의 상관관계 추정
전환영(HWanYoung Jeun),류미라(MiRa Ryu),배효준(HyoJun Bae),김영희(YoungHee Kim),박흥식(HeungSik Park) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.6
The effect of manufacturing parameters on friction characteristics of motorcycle break system was studied using a disk-on-pad type friction tester. Such parameters conditions have an effect on the frictional factor such as applied load, sliding speed, and number of ventilated disk hole. However, it is difficult to know the mutual relation of these factors. In this study, the friction characteristics using design of experiment containing 3 elements were investigated for an optimal condition for the best motorcycle break system employing regression analysis method. From this study, the result was shown that the applied load in frictional factors was the most important, next to sliding speed, number of ventilated disk hole.
류미라(MiRa Ryu),전환영(HWanYoung Jeun),배효준(HyoJun Bae),김영희(YoungHee Kim),박흥식(HeungSik Park) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
The effect of manufacturing parameters on friction characteristics of motorcycle break system was studied using a disk-on-pad type friction tester. Such parameters conditions have an effect on the frictional factor such as applied load, sliding speed, and number of ventilated disk hole. However, it is difficult to know the mutual relation of these factors. In this study, the friction characteristics using design of experiment containing 3 elements were investigated for an optimal condition for the best motorcycle break system employing regression analysis method. From this study, the result was shown that the applied load in frictional factors was the most important, next to sliding speed, number of ventilated disk hole.