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심규성(Kyu Sung Sim),김종원(Jong Won Kim),김연순(Yeon Soon Kim),명광식(Kwang Sik Myeong) 한국수소및신에너지학회 1998 한국수소 및 신에너지학회논문집 Vol.9 No.1
The catalytic hydrogenation of carbon dioxide has been studied for the fixation of carbon dioxide to mitigate global warming problems, but it needed hydrogen, which the price is still high. Recently, the electrochemical reduction of carbon dioxide has been drawn attractions because carbon dioxide could be converted to the valuable chemicals such as methane, ethane and alcohols electrochemically in the electrolyte solution using a catalytic electrode. This system is simple because the water electrolysis and hydrogenation take place at the same time using the surplus electricity at midnight. In this work, a continuous electrochemical reduction system was fabricated, which was composed of the reduction electrode(copper or perovskite type, 2 × 2 ㎠), reference electrode(platinum, 2 × 6 ㎠), standard electrode(Ag/AgCl), and potassium bicarbonate electrolyte solution saturated with carbon dioxide. The quality and quantity of the products and reduction current were analyzed, according to the electrolyte concentration and electrode type.
Cu/ZnO/Cr2O₃/Al₂O₃ 촉매를 이용한 이산화탄소의 수소화 연구
심규성(Kyu Sung Sim),한상도(Sang Do Han),김종원(Jong Won Kim),김연순(Youn Soon Kim),명광식(Kwang Sik Myoung),박기배(Ki Bae Park) 한국수소및신에너지학회 1996 한국수소 및 신에너지학회논문집 Vol.7 No.2
The aim of this study is the development of technologies of methanol production from carbon dioxide by catalytic hydrogenation. Experiments about carbon dioxide hydrogenation by catalyst mixed with CuO, ZnO, Cr₂O₃ and Al₂O₃ were conducted to find optimum catalyst and reaction condition. Reactions were carried out at atmospheric and high pressures between 200 to 350℃. High yield of methanol was obtained with Cu/ZnO/Cr₂O₃/Al₂O₃ catalyst at 250℃ and above 30 atmospheric pressure. There was not any increament of hydrogenation reactivity for the catalysts which was made by the addition of Pd to Cu/ZnO/Cr₂O₃/Al₂O₃.
Ti Mesh 처리 촉매전극을 이용한 고체고분자 전해질 전기분해 특성연구
심규성(Kyu Sung Sim),김연순(Youn Soon Kim),김종원(Jong Won Kim),한상도(Sang Do Han) 한국수소및신에너지학회 1996 한국수소 및 신에너지학회논문집 Vol.7 No.1
Alkaline water electrolysis has been commercialized as the only large-scale method for a long time to produce hydrogen and the technology is superior to other methods such as photochemical, thermochemical water splitting, and thermal decomposition method in view of efficiency and related technical problem. However, such conventional electrolyzer do not have high electric efficiency and productivity to apply to large scale hydrogen production for energy or chemical feedstocks. Solid polymer electrolyte water electrolysis using a perfluorocation exchange membrane as an H<sup>+</sup> ion conductor is considered to be a promising method, because of capability for operating at high current densities and low cell voltages. So, this is a good technology for the storage of electricity generated by photovoltaic power plants, wind generators and other energy conversion systems. One of the most important R&D topics in electrolyser is how to minimize cell voltage and maximize current density in order to increase the productivity of the electrolyzer. A commercialized technology is the hot press method which the film type electrocatalyst is hot-pressed to soild polymer membrane in order to eliminate the contact resistance. Various technologies, electrocatalyst formed over Nafion membrane surface by means of nonelectrolytic plating process, porous sintered metal(titanium powder) or titanium mesh coated with electrocatalyst, have been studied for preparation of membrane-electrocatalyst composites. In this study some experiments have been conducted at a solid polymer electrolyte water electrolyzer, which consisted of single cell stack with an electrode area of 25cm² in a unipolar arrangement using titanium mesh coated with electrocatalyst.
심규성(Kyu Sung Sim),김종원(Jong Won Kim),김연순(Youn Soon Kim),박기배(Ki Bae Park) 한국수소및신에너지학회 1995 한국수소 및 신에너지학회논문집 Vol.6 No.1
Chemical heat pump is one of the energy conversion technologies, which enables to use waste heat as a source of high grade heat. In 2-propanol/acetone system, the dehydrogenation of 2-propanol is an endothermic(heat absorption) reaction, and can be used to generate hydrogen because 2-propanol can be converted to acetone and hydrogen at low temperature(about 8℃) using catalyst. For the dehydrogenation of 2-propanol 5% Ru catalyst based on activated carbon is the best one at the reaction temparature of 83℃.
김종원,심규성,손영목,이상호,박기배,명광식 ( Jong Won Kim,Kyu Sung Sim,Young Mok Son,Sang Ho Lee,Kee Bae Park,Kwang Shik Myung ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.6
Problems encountered in use of pulverized coal, in particular, have practical implications related to coal blending and up-grading of imported coals. Practically, significant problems are recognized in such aspects as control of the combustion process, fireside corrosion, ash and pollution. The methodology of predicting problems using pilot scale facility is less expensive, requires less coal and less time to excute, compared to the use of full scale facility. In this study, evaluation of Indonesian Roto coal was performed in a pilot scale coal combustion test facility. Burnout ratio of coal was higher than 98%, and increase of swirl number and preheat temperature of air made flame stabilize. NO_χ concentration in flue gas was lower in the range 0.5-0.9 of swirl number. Concentrations of oxygen and carbon dioxide in flue gas were constant in spite of variation of swirl number in this work.
김종원,손영목,심규성,박기배,이상호 ( Jong Won Kim,Young Mok Son,Kyu Sung Sim,Kee Bae Park,Sang Ho Lee ) 한국센서학회 1994 센서학회지 Vol.3 No.1
Catalytic combustion type sensor was fabricated for alcohol detection, and its characteristics were tested. When the resistance of Pt coil for pellistor is 2.0 ohm, suggestible input power to bridge circuit was about 300 mW for methanol detection, and in the range from 350 mW to 400 mW for ethanol. Pellistors were prepared by means of impregnating Pt or Pd on the γ-alumina bead for sensing element, and transition metals such as Co₃O₄, Fe₂O₃ for compensating element.