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Spinel形 Ferrite觸媒에 依한 一酸化炭素의 轉化反應
李根培,高熙燦 중앙대학교 기술과학연구소 1984 기술과학연구소 논문집 Vol.14 No.-
The conversion of carbon monoxide to carbon dioxide over various spinel ferrites was investigated by continuous reaction technique. These catalysts were prepared by coprecipitation and characterized by means of X-ray diffraction and BET studies. Activity of copper Ferrite si the most of any other ferrites. In this case it seems that the mole ratio of CuSO_4 vs FeSO_4 is 0.01:0.24. The conversion of CO to CO_2 over that was found 99.5%. The kinetic analysis of conversion data indicates the occurrence of first order. The wasted ferrite sludge is indicated by low activity. But these experiments show the possibility of utilizing the ferrite sludge by exchanging +2 ion ie Cu, Ni, Co, Zn and Fe.
분체공학 유동충 재료 ( 무기 , 유기 , 고분자 ) : 졸 - 겔 공정을 이용한 미세다공정 RuO2-TiO2 전극의 제조
황규연(Kyu Yeun Hwang),고희찬(Hee Chan Ko),여태환(Tae Whan Yeu) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
Microporous RuO₂-TiO₂binary metal oxide electrodes with various compositions were prepared by the sol-gel process. Ruthenium chloride hydrate and titanium isopropoxide were used as precursors, and isopropyl alcohol was used as a solvent. Sol solutions were stable and uniform at room temperature. With increasing mole ratio of RuO₂in the metal oxide electrode, RuO₂particle grew on the electrode surface and specific surface area was decreased. From Tafel plots and anodic polarization curves, the binary metal oxide electrode with 40% RuO₂showed the highest exchange current density and the lowest overpotential for oxygen evolution.
에너지/환경 : 질산망간의 건식-복사열분해 온도에 따른 탄탈륨 콘덴서 특성 연구
김재근 ( Jae Kun Kim ),유지영 ( Jee Young Yoo ),민혜경 ( Hye Kyong Min ),고희찬 ( Hee Chan Ko ) 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.3
The characteristics of manganese dioxide(MnO_2) layer for the solid electrolyte of trantalum condenser formed in accordance with its pyrolysis temperature by a dry-radiational pyrolysis instead of a traditional wet-convectional pyrolysis of manganese nitrate was studied. As a result of TG/DSC analysis, manganese nitrate was started to be pyrolyzed at the temperature range from 180 to 230℃ through dehydration process and was transformed into MnO_2 single phase at the temperature range form 230 to 250℃. Trantalum pellets were pyrolyzed at intervals of 20℃ from 200 to 300℃ in a radiational furnace on the basis of TG/DSC results and then re-anodized. There were nothing particular physical problems on the dielectric layer after pyrolysis. The condensers pyrolyzed between 240 and 260℃ recorded better properties like as a higher withstanding voltage and a lower leakage current. According to the impedance and SEM analysis results on the tantalum condenser pyrolytically ide layers were forned by a dry-radiational pyrolysis and its properties like as capacitance, dissipation factor, internal resistance and frequency dependency were improved with the increase of the pyrolysis temperature.
분체공학 유동충 재료 ( 무기 , 유기 , 고분자 ) : AC Impedance 를 이용한 알칼라인 건전지의 전기 화학적 특성 분석
황규연(Kyu Yeun Hwang),황성민(Sung Min Hwang),고희찬(Hee Chan Ko),전병욱(Byung Uk Jun),여태환(Tae Whan Yeu) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
To understand the dynamic behavior of an alkaline zinc-manganese dioxide battery, AC impedance analysis was performed with pulse discharged and self-discharged cells. To observe the variations of open circuit voltages and internal resistances of both positive and negative electrodes, the Hg/HgO micro-reference electrode was inserted between a separator and a positive electrode. While the internal resistance increased at the positive electrode dominated cell performance during pulse discharge, the internal resistance increased mainly at the negative electrode due to the by zinc corrosion during self-discharge.
분체공학 유동층 재료 ( 무기 , 유기 , 고분자 ) / 미세다공성 RuO2-ZrO2 복합 금속 산화물 전극의 제조
이강만(Kang Man Lee),황규연(Kyu Yeon Hwang),고희찬(Hee Chan Ko),여태환(Tae Whan Yeu) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.3
Without drying control chelating agent, stable and uniform zirconia sol was obtained at Zr(OCH₂CH₂CH₃)₄: C₂H_5OH : H₂O : HNO₃=1 : 50 : 4 : 0.16 RuO₂-ZrO₂/Ti mixed metal oxide electrodes were obtained by dip-coating on titanium substrate. The X-ray diffraction patterns of metal oxides fired at 450℃ conformed a tetragonal-type ZrO℃ and a rutiletype RuO₂regardless of oxide composition. Intensity of XRD varied linearly with oxide compositions. By addition of ZrO₂, the specific surface area increased. Mixed metal oxide electrodes containing RuO₂more than 40% exhibited no crack and uniform coating surface. The mixed metal oxide electrode containing 40% RuO₂showed higher exchange current density and lower overpotential for the oxygen evolution with higher specific surface area compared to RuO₂/Ti electrode prepared by a thermal decomposition.