Pt/TiO₂ 코팅 세라믹 허니컴 촉매를 이용한 수소 제어

강연석,김성수,서필원,이승현,홍성창,Kang, Youn Suk,Kim, Sung Su,Seo, Phil Won,Lee, Seung Hyun,Hong, Sung Chang 한국공업화학회 2011 공업화학 Vol.22 No.6

수소를 제어하기 위한 기술 중 최근에 각광받는 방법으로는 피동형 촉매 재결합기(PAR)가 있다. PAR설비에서의 핵심기술인 촉매를 제조한 후 이를 이용하여 수소 재결합 성능 평가를 실시하였다. 실험은 공간속도(GHSV)를 $35000{\sim}100000hr^{-1}$로 변경하며 실시한 결과 공간속도가 증가할수록 수소의 전화율은 감소하였으나 시간당 제거되는 수소의 중량은 크게 증가하였다. 백금의 담지량을 달리하여 촉매를 제조한 후 실험을 수행한 결과 3 wt%에서는 별다른 전화율 차이를 보이지 않았으나 활성금속의 담지량이 증가하면서 승온속도가 증가되는 것을 확인 할 수 있었다. 이와 같은 공간속도 및 촉매 담지량 실험 결과 본 촉매는 상온 상압에서 80% 이상의 높은 전화율을 보이는 것을 확인 할 수 있었다. Passive autocatalytic recombiner (PAR) is considered as an explosive gas control system in operating NPP plants. This work investigates and evaluates hydrogen recombination performance over manufactured $Pt/TiO_2$ catalysts. When the space velocity increases, the hydrogen conversion decreased, while hydrogen depletion rate (g/sec) increases highly in $35000{\sim}100000hr^{-1}$ Gas Hourly Space Velocity (GHSV). Hydrogen conversion and depletion rate with Pt loading is investigated. As a result, there were no differences in the hydrogen conversion, but exothermic heating rate (K/sec) is increases as Pt loading increases. The catalyst showes a high hydrogen conversion efficiency of 80% under atmospheric conditions.

석탄 연소시 SOx 배출 특성에 관한 연구

강연석 ( Youn Suk Kang ),김성수 ( Sung Su Kim ),이현동 ( Hyun Dong Lee ),김재관 ( Jae Kwan Kim ),홍성창 ( Sung Chang Hong ) 한국공업화학회 2011 공업화학 Vol.22 No.2

SM (India)탄과 Berau, C&A (Austria)탄을 이용하여 SOx 배출 특성을 조사하였다. 실험은 석탄 충진 후 노의 온도를 승온하며 발화점에서 연소되도록 하는 방법과 노의 온도를 일정온도로 유지한 후 석탄을 투입하는 두 가지 방법으로 수행하였다. 실험 결과 연소시 발생되는 SOx는 황 함량에 의해 의존됨을 확인하였다. Berau탄과 C&A탄의 경우 연소성의 증진 즉, 연소온도의 상승과 주입 공기량의 증가, 탄의 입자크기의 감소가 이루어질 경우, SO2의 발생이 증가하는 경향을 나타내었다. 반면, SM탄의 경우에는 반대로 발생되는 SO2의 농도가 감소하는 경향을 나타내었다. 이는 회분내의 Fe2O3의 높은 함량이 탄 자체의 산화력을 증가시켜 SO2를 SO3로 산화시키는 것으로 나타났다. C&A탄의 경우 SO2 발생 peak가 두 번 발생하였다. 이는 표면에서 내부로의 열 전달속도에 기인하는 것으로 판단된다. The characteristics of SOx emission were investigated using SM (India) coal and Berau, C&A (Austria) coal. Experiments were performed in two different ways. In the first type of experiment, the temperature in the furnace was increased and the, samples were combusted at the ignition temperature after filling the furnace with coal. The second experimental method was to add the coal to after maintaining a constant temperature. The results demonstrated that SOx emission from coal combustion depended upon the sulfur content. In the case of Berau coal and C&A coal, an enhancement of combustibility which was accomplished by increasing the combustion temperature, an increase in airflow and decrease in particle size of coals tended to increase SO2 generation. Conversely, in the case of SM coal, the concentration of SO2 tended to decrease, because the high contents of Fe2O3 in the ashes increased the oxidation power of coal itself, which oxidized SO2 into SO3. In the case of C&A coal, the SO2 peak was only observed twice. This was thought to be caused by the thermal transfer rate from the surface to the interior of the coal.

韓國『黃帝內經』硏究 略史

강연석(Kang Youn Suk),김남일(Kim Nam Il) 한국의사학회 2008 한국의사학회지 Vol.21 No.1

The practice of studying 『黃帝內經』is one that is deeply rooted throughout Korean history. The main textbook used in educational institutions as early as the Era of the Three States, it was also actively examined. A doctor examination system was introduced in the Koryo dynasty, which reinforced『Internal Classic』’s status as an important subject of study. Following the nation-wide acceptance of Confucism, scholar-physicians came to be and this book was studied as an important scripture. By Chosun dynasty, the entire medical systems becomes centered around 『Internal Classic. Internal Classic is not only included in medical examination manual written in the period of Sejong’s rein but was cited in many medical texts published during this time span including Euibangyoochi, Hyngyakjipseongbang, and thus can bee seen as the conceptual basis of medicine. In late Chosun dynasty with the emergence of the Korean Traditional Medicine’s scripture, The Treasured Mirror of Eastern Medicine, 『Internal Classic』is spotlighted as a scripture of importance among medical families. Lee Kyu-Jun, a doctor of the Japanese occupation era, examined 『Internal Classic』 based on a theory called fuyang theory and produced a creative medical theory.

Pt/TiO2 코팅 세라믹 허니컴 촉매를 이용한 수소 제어

강연석 ( Youn Suk Kang ),김성수 ( Sung Su Kim ),서필원 ( Phil Won Seo ),이승현 ( Seung Hyun Lee ),홍성창 ( Sung Chang Hong ) 한국공업화학회 2011 공업화학 Vol.22 No.6

수소를 제어하기 위한 기술 중 최근에 각광받는 방법으로는 피동형 촉매 재결합기(PAR)가 있다. PAR설비에서의 핵심기술인 촉매를 제조한 후 이를 이용하여 수소 재결합 성능 평가를 실시하였다. 실험은 공간속도(GHSV)를 35000~100000 hr -1로 변경하며 실시한 결과 공간속도가 증가할수록 수소의 전화율은 감소하였으나 시간당 제거되는 수소의 중량은 크게 증가하였다. 백금의 담지량을 달리하여 촉매를 제조한 후 실험을 수행한 결과 3 wt%에서는 별다른 전화율 차이를 보이지 않았으나 활성금속의 담지량이 증가하면서 승온속도가 증가되는 것을 확인 할 수 있었다. 이와 같은 공간속도 및 촉매 담지량 실험 결과 본 촉매는 상온 상압에서 80% 이상의 높은 전화율을 보이는 것을 확인 할 수 있었다. Passive autocatalytic recombiner (PAR) is considered as an explosive gas control system in operating NPP plants. This work investigates and evaluates hydrogen recombination performance over manufactured Pt/TiO2 catalysts. When the space velocity increases, the hydrogen conversion decreased, while hydrogen depletion rate (g/sec) increases highly in 35000~100000 hr -1 Gas Hourly Space Velocity (GHSV). Hydrogen conversion and depletion rate with Pt loading is investigated. As a result, there were no differences in the hydrogen conversion, but exothermic heating rate (K/sec) is increases as Pt loading increases. The catalyst showes a high hydrogen conversion efficiency of 80% under atmospheric conditions.

전산유체해석을 이용한 고수분 ․ 고점성 분진 제거용 원심여과집진기 설계기술

장두훈(Duhun Jang),강연석(Youn Suk Kang),신흥순(Heung Sun Shin),이철규(Cheolgyu Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.4

고온 SCR 촉매의 반응 특성 및 효율 증진에 관한 연구

남기복 ( Ki Bok Nam ),강연석 ( Youn Suk Kang ),홍성창 ( Sung Chang Hong ) 한국공업화학회 2015 공업화학 Vol.26 No.6

In this paper the selective reduction catalyst (SCR) for controlling the NOx at high temperature range was studied. XRD and FT-IR BET analysis was also performed to determine the structural properties and adsorption/desorption characteristics of the catalyst. In the case of anatase TiO2 support, a negligible NOx conversion was observed, but the W/TiO2 catalyst made using W as a active metal showed an excellent ability to remove NOx. In particular, the W/TiO2 exhibited a rapid increase in the catalytic activity due to the presence of W for the NOx conversion compared to that of using the pure TiO2 at a high temperature range over 400 ℃. In addition, the phenomenon of reduced reaction activity due to the heat shock for a long time was found to be suppressed.

암모니아수 처리에 따른 바나듐 레독스 흐름전지용 탄소펠트 전극의 전기화학적 특성

김거종 ( Geo Jong Kim ),서필원 ( Phil Won Seo ),강연석 ( Youn Suk Kang ),홍성창 ( Sung Chang Hong ) 한국공업화학회 2014 공업화학 Vol.25 No.3

In this study, nitrogen doped carbon felt (CFt) is prepared using thermal oxidation and liquid phase ammonia treatment toimprove the efficiency for vanadium redox flow batteries (VRFB). The electrochemical properties of prepared CFt electrodesare investigated using cyclic voltammetry (CV) and charge/discharge test. The XPS result shows that the increase of liquidphase ammonia treatment temperature leads to the increased nitrogen functional group on the CFt surface. Redox reaction characteristicsusing CV reveal that the liquid phase ammonia treated CFt electrodes are more reversible than the thermally oxidizedCFt. When CFt is treated by the liquid phase ammonia at 300 ℃, VRFB cell energy efficiency, voltage efficiency, andcurrent efficiency are increased about 6.93%, 1.0%, and 4.5%, respectively, compared to those of the thermally oxidized CFt. These results are because nitrogen functional groups on CFt help to improve the electrochemical properties of redox reactionbetween electrode and electrolyte interface.