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송진훈 ( Jin Hoon Song ),우명우 ( Myung Wu Woo ),( Ki Joong Kim ),김세훈 ( Sae Hoon Kim ),인병기 ( Byung Ki Ahn ),임태원 ( Tae Won Lim ),박권필 ( Kwon Pil Park ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
Contamination of ion from cathode air on the membrane and electrode assembly (MEA) is the serious degradation source in proton exchange membrane fuel cells (PEMFC). In this study, concentration of ions in air at industry region, street and seaside were measured, There were comparably high concentration of Na+, K+, Ca2+ and Fe3+ in this regions, This paper shows the effects of MEA contamination by these ions generated from humidification water. After 170 hours of fuel cell operation using city water as humidification water, the performance of unit cell decrease to 11% of initial performance. The electrolyte membrane easily absorbed foreign contaminant cations due to the stronger affinity of foreign cations with the sulfonic acid group compared to H+. The contaminant ions existing in the interface between the platinum catalyst and ionomer layer turn out to be the most serious factor to decrease cell performance.
TPD Chromatogram의 해석에 관한 연구 - Ⅰ
우명우,정창남 순천대학교 공업기술연구소 1988 工業技術硏究所論文集 Vol.2 No.-
A theoretical study of TPD chromatogram was carried out theoretically. From this result we concluded that TPD chromatogrom is influenced by desorption kinetics, desorption activation energy and whether readsorption exists or not. Also variations of desorption activation energy with coverage influences the TPD chromatogram. Linear of hyperbolic heating schedule of the experiment is little influencing to the TPD chromatogram.
H-ZSM-5 촉매상에서 메탄올로부터 Dimethyl ether 생성반응에 관한 실험 연구
우명우 순천대학교 공업기술연구소 1987 工業技術硏究所論文集 Vol.1 No.-
This study is to prepare ZSM5 catalyst. to examine its characteristics, reactivity and to apply it to the methanol conversion reaction. Reaction experiment was conducted in a packedbed differential reactor under the conditions of negligible mass transfer resistance and sufficiently low conversion. Within the range of the experimental conditions the reaction was found to follow the singlesite mechanism and ratedetermining was adsorption of methanol. Thus it was possible to express the reaction rate equation in the EleyRideal type.
우명우,이화영,이현구,김만회 한국화학공학회 1987 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.25 No.4
TPAH -Na₂O-SiO₂-Al₂O₃-H₂O 반응계를 이용하여 여러가지 ZSM-5 제올라이트 촉매를 제조하고, ZSM-5 결정의 생성과 성장에 영향을 주는 반응혼합물의 조성과 pH, 반응온도 및 반응시간에 대하여 연구하였다. 생성된 ZSM-5 촉매의 물리, 화학적 특성을 XRD, SEM, TPD, IR, TG, DTA 및 DTG를 사용하여 분석하고 메탄올 전환반응실험을 실시하여 ZSM-5 촉매의 반응성을 조사하였다. 실험결과에 의하면 ZSM-5 촉매는 SiO₂/Al₂O₃의 비가 20이상으로 되고, pH가 9-10.5의 범위로 유지될 때 150℃ 전후의 반응온도에서 잘 생성되었다. 이와 같은 방법으로 제조된 촉매는 메탄올 전환반응에 대하여 우수한 활성을 나타내었다. Various ZSM-5 zeolite catalysts were prepared by using the reaction mixture TPAH-Na₂O-SiO₂-Al₂O₃-H₂O . The composition and pH of the reaction mixture, the reaction temperature, and the reaction time were found to be important factors for the formation and growth of ZSM-5 crystal. The physical and chemical characteristics of the ZSM-5 cataylsts were examined by employing the XRD, SEM, XPS, TPD, IR, and TG-DTA-DTG methods, and their activities were tested by conducting the methanol conversion experiment. The ZSM-5 catalyst was obtained favorably when the SiO₂/Al₂O₃ ratio was greater than 20, the pH in the range from 9 to 10.5, and the reaction temperature about 150℃. The catalyst so prepared proved to be very active for the conversion of methanol.
Single Screw Extruder에 의한 고분자 압출 가공에 관한 연구
김명렬,우명우 順天大學校 1995 論文集 Vol.14 No.1
We studied polymer extrusion in a single screw extruder numerically. Single screw extruder can be analyzed by 6 zones, hopper zone, solid conveying zone, metering zone, breaker zone, adapter zone, and die zone. We derived the sets of governing equation of the each section. These equations were solved by using the Crank-Nicolson finite difference scheme. From the numerical results, the derived equations are reasonable. And we conculded that the revolution speed of the extruder is the dominant operating variables to the extrusion rate. Also we concluded that the temperature distributions of the extruder are effect to the rate of extrusion rate. But the properties of polymer are little effect to the extrusion rate.