알칼리형 연료전지에서의 산소극 제조

문세기,김형진,공성호,조장호,김영채 한양대학교 에너지·환경기술연구소 1997 에너지·環境技術論文集 Vol.3 No.-

알칼리형 연료전지(Alkaline fuel Cell, 이하 AFC)의 산소극에 사용되는 촉매를 은 염의 화학적 환원법으로 제조하였다. 그리고 최적의 전극 제조 조건을 찾기 위해 촉매의 loading량, 전극 소결 온도, PTFE함량 및 촉매 입자 크기 등이 전극의 분극특성에 미치는 영향들이 조사되었다. 연구결과에 의하면, 최적 조건은 전극 소결 온도 350℃, PTFE 함량 9wt%, 촉매의 입자크기 68㎛ 이하이었다. 한편 촉매 loading량이 증가함에 따라 전극 성능이 향상되었다. 최적의 제조 조건에서 제작된 전극은 개회로 전위 1.11V(vs. RHE),200㎷ 분극(전극전위 0.91V vs. RHE)시 전류밀도 약 0.4A/㎠,300㎷ 분극 (전극전위 0.81V vs. RHE)시 전류밀도 1.0A/㎠의 성능을 나타내었다. Doped silver catalyst used for oxygen electrode in alkaline fuel cells was prepared by reduction method of silver salt. And the effects of the silver catalyst loading, electrode sintering temperature, content of PTFE and particle size of the catalyst on the polarization characteristics of the oxygen electrodes were investigated to find the optimum preparation conditions of the electrodes. According to the results of this work, the optimum conditions were sintering temperature of 350℃, PTFE content of 9 wt% and below catalyst particle size of 68 ㎛. On the other hand, with increasing the catalyst loading, the electrode performance was improved. The electrode prepared at the optimum conditions showed open circuit potential of 1.11V(vs.RHE), current density of 0.4A/㎠ at a overpotential of 200㎷ and 1.0A/㎠ at a overpotential of 300㎷.

ZnO/ZSM-5상에서 저탄소가의 탄화수소로부터 방향족화의 성능향상

서교택,문세기,김형진 한양대학교 에너지 ·환경기술연구소 1995 에너지·環境技術論文集 Vol.2 No.-

n-헥산의 방향족화 반응에서 HZSM-5에 기계적으로 혼합 첨가된 ZnO의 영향을 연구하였다. n-헥산의 방향족화 반응에 있어서, HZSM-5 자체 만으로도 활성을 나타냄은 물론 HZSM-5에 ZnO가 첨가됨에 따라 활성이 더욱 증대되었다. 이는 ZnO/HZSM-5에서의 방향족화 반응은 이원 기능 과정임을 나타내는 것으로서, 이때 ZnO의 역활은 n-헥산의 탈 수소 반응을 촉진하는 것으로 생각된다. 첨가된 ZnO는 촉매의 산도, 결정성 및 표면적에는 거의 영향을 주지 못하는 반면, 전화율과 방향족 화합물로의 선택도와 같은 촉매 활성에는 많은 변화를 주었다. 그러나, 무엇보다도 중요한 것은 급격한 촉매 활성의 저하를 방지하는 것이라 할 수 있다. The effect of ZnO added to HZSM-5 catalyst by mechanical mixing in aromatization of n-hexane has been studied. It is shown that HZSM-5 alone is active for aromatization of n-hexane and the activity is enhanced by addition of ZnO to the HZSM-5 catalyst. This suggests that the aromatization on the Zno-added catalysts(ZnO/HZSM-5) is a bifunctional process, in which ZnO seems to catalyze the dehydrogenation of n-hexane. Addition of ZnO makes less change in acidity, crystallography and surface area, but leads to significant change in activity in terms of conversion and selectivity toward aromatics. What is more important, however, is that it prevents the rapid decay of catalyst-activity.

탄광부 진폐증의 운동지수

조영선,김세곤,문우기,유재인,정치경 가톨릭대학 산업의학 센타 산업의학연구소 1984 韓國의 産業醫學 Vol.23 No.3

Exercise index(EI) was measured on 933 pneumoconiosis patients (865 patients with small rounded opacities and 68 patients with large opacities) and 176 suspected pneumoconiosis patients from Korean anthracitic mines, in order to evaluate the ventilatory impairment of pulmonary function according to the chest radiographic findings of pneumoconiosis. Exercise index was obtained from the maximum breathing capacity (MBC) and the exercise ventilation volume(EV) which were measured by spirometer and two step-test. Classification of pneumoconiosis was based on the international classification of ILO U/C. The results were as follows: 1. The mean value of E1 was significantly increased in pneumoconiosis patients with large opacities(46.0%) than in patients with small rounded opacities(26.5%) and with suspected pneumoconiosis(25.0%). The number of jpatients in substandard EI was 97.1% in patients with large opacities but 49.4% in patients with small rounded opacities and 40.3% in patients with suspected pneumoconiosis. 2. The mean values of EI and the number of patients in substandard EI were markedly increased in pneumoconiosis patients with small rounded opacities and suspected over 50 years of age. However, the number of patients in substandard EI showed no association with age in pneumoconiosis patients with large opacitis. 3. In pneumoconiosis patients with small rounded opacities, the mean values of EI and the number of patients in substandard EI showed significant association with the profusion (category) but no significant association with the type of small rounded opacities. 4. In pneumoconiosis patients with large opacities, the mean values of EI and the number of patients in substandard EI showed no significant difference between patients complicated with and without pulmonary tuberculosis. 5. No significant association of EI and the number of patients in substandard EI with the size of large opacities was observed in pneumoconiosis patients with large opacities, however, the mean values of EI showed increasing tendenccy in category B and C compared to category A.

MgO에 담지된 촉매에서의 메탄의 짝지움 반응에 관한 연구

박종걸,김영채,문세기 한양대학교 에너지·환경기술연구소 1997 에너지·環境技術論文集 Vol.3 No.-

연속 흐름식 상압 반응기에서 메탄과 산소를 반응물로 하고 MgO,CaO,γ-Al₂O₃담체에 활성물질인 Li₂CO₃를 담지하여 제조한 촉매를 사용하여 반응 조건을 변화시키면서 메탄의 oxidative coupling 반응을 행하였다. Li₂CO₃담지시 활성이 크게 향상되었으며 MgO, CaO에는 9㏖%,γ-Al₂O₃에는 17㏖%를 담지 하였을 때 수율이 가장 좋았으며, 활성은 MgO>CaO>γ-Al₂O₃순으로 나타났다. Li₂CO₃(9㏖%)/MgO, CaO 촉매에서 최적 반응 조건은 온도 1030K P(CH₄)/P(O₂)=1, 접촉시간(W/F)은 0.0067g-cat.min/㎖였다. In the plug-flow at atmospheric reactor, the oxidative coupling of methane was performed with methane and oxygen using the catalysts prepared by impregnation of MgO, CaO,γ-Al₂O₃with Li₂CO₃in the various reaction conditions. The activity was enhanced at impregnation Li₂CO₃. The yield was utmost at 9㏖% in MgO, CaO and 17㏖% in γ-Al₂O₃. The activity was in order of MgO, CaO,γ-Al₂O₃. The optimum reaction condition was 1030K, P(CH₄)/P(O₂)=1, and 0.0067g-cat.min/㎖ in Li₂CO₃(9㏖%)/MgO,CaO catalyst.

Reconstitute Tobacco Product Drying Model

Moon, Sei Ki,Yi, Sung Chul 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.2

Drying is one of the most energy-intensive and frequently used processes in the tobacco industry. In the present work, heat and mass transfer phenomena in drying sheet materials with impinging air flow are analyzed. A blended leaf (BL) drying model is developed and validated to predict the drying behavior of the reconstitute tobacco product. A numerical method of line technique [Schiesser, 1991] was used to solve the coupled differential equations governing the drying process. This model has been successfully applied to simulate BL drying processes in the pilot plant and the BL plant. The present model provides a relatively fast and efficient way to improve process performance, increase plant productivity, and optimize energy utilization. With this model the number of trials necessary to achieve the objectives is reduced, in other words, a large amount of time, money, and manpower is saved. The model results are also helpful in studying the drying behavior of reconstitute tobacco products and understanding the effect of dryer profiles on the sheet strength and subjective results.

ISOTHERMAL INTERPHASE DIFFUSION WITH CONSECUTIVE REACTIONS

Moon, Sei Ki,Won, You Sung 한국화학공학회 1985 Korean Journal of Chemical Engineering Vol.2 No.1

Effect of Short - Chain Alcohols as Co - surfactants on Pseudo - ternary Phase Diagrams Containing Lecithin

Moon, Sei Ki,Oh, Seong Geun,Choi, Suk Young,Bae, Seong Youl 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.3

Lecithin is a natural amphiphilic molecule, the microemulsions of which are often employed as a transdermal delivery medium of drugs and cosmetics. However, it constructs a microemulsion and lamellar phase in a phase diagram without co-surfactant only at a narrow range of composition. In this study, the effect of several short-chain alcohols on pseudo-ternary phase diagrams composed of lecithin, water and dodecane containing 1.0 wt% lidocaine (local anesthetic) was investigated in relation to the application of lecithin-based microemulsion for transdermal drug delivery. The phase diagram for an aqueous solution containing 80.0 wt% ethanol showed a lamellar structure (LC) and bicontinuous isotropic regions. When the mixing ratio of lecithin to alcohols (1-propanol, 1-butanol and n-pentanol) was 2 : 1, water-in-oil (L2) and oil-in-water (L1) microemulsions and LC were obtained in a certain range of compositions. The maximum solubilization of water into L2 phase was 38 wt% when the total surfactant was 43 wt% with butanol as cosurfactant.

NaY 및 LiY Zeolite 로 부터 흡착질의 열탈착

문세기,류경옥,김병진 한국화학공학회 1977 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.15 No.2

吸着質-吸着媒間의 相互作用에 관한 정보를 얻기 위하여 NaY 및 LiY로부터 benzene, cyclohexane, methanol 및 ethanol의 熱脫着에 대하여 硏究하였다. 여러가지 一定昇溫率로 脫着溫度를 50℃로부터 400℃까지 昇溫시키면서 熱傳導度 cell을 利用하여 吸着質의 脫着曲線을 얻었다. 熱說着速度는 吸着量에 대하여 1次라 가정하여 說着曲線으로부터 活性化에너지를 구하였다. 實驗結果로부터 炭化水素는 NaY보다 LiY와 더 강력 한 吸着을 하고 있으며 benzene은 cyclohexane보다 ethanol은 methanol보다 zeolite에 대한 作用力이 크다는것을 알았다. 또한 吸着量이 減少함에 따라 benzene의 脫着活性化에너지는 比較的 급격히 增加하나 alcohol의 경우에는 완만히 增加함을 알았다. The thermal desorption of benzene, cyclohexane, methanol and ethanol from NaY and LiY zeolites has been studied to obtain information on the adsorbate-adsorbent interaction. The desorption rates of these hydrocarbons were measured with thermal conductivity cell increasing the desorption temperature from 50˚ to 400℃ with various constant heating rates. Activation energy of desorption was determined from the desorption curve, assuming the desorption rate is first order with respect to the surface coverage. The activation energy of benzene increased rapidly but that of alcohol did gradually as the surface coverage decreased. Experimental results showed that these four hydrocarbons were strongly adsorbed on LiY rather than NaY. Data also revealed that the interaction of benzene with zeolites was stronger than that of cyclohexane and the interaction of ethanol was stronger than that of methanol.

Damping Index of Doppler Hepatic Vein Waveform to Assess Severity of Portal Hypertension and Response to Propranolol

( Moon Young Kim ),( Soon Koo Baik ),( Dong Hun Park ),( Kyu Hong Kim ),( Jung Min Kim ),( Ki Tae Suk ),( Jae Woo Kim ),( Hyun Soo Kim ),( Sang Ok Kwon ),( Young Ju Kim ),( Sei Jin Chang ),( Samuel S. 대한간학회 2007 Clinical and Molecular Hepatology(대한간학회지) Vol.13 No.3(S)

Development of Oral Vaccine Candidate Using Lactobacillus Expressing Hemagglutinin (HA) and M2 Antigen of Avian Influenza Virus

Sei Jin Park,Il Han Lee,Seung Pyo Hong,Young Ki Choi,Har Young Poo,Chul Joong Kim,Moon Hee Sung 대한인수공통전염병학회 2008 창립총회 및 학술대회 초록집 Vol.2008 No.1