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방사성 폐기물 소각공정을 위한 선택적 촉매 환원법 연구
이한수,김인태,정흥석,안도희,김종호,양희성,황재영,김상환 ( Han Soo Lee,In Tae Kim,Hongsuk Chung,Do Hee Ahn,Jong Ho Kim,Hee Sung Yang,Jae Young Hwang,Sang Hwan Kim ) 한국공업화학회 1996 공업화학 Vol.7 No.4
방사성 폐기물 소각로의 배기가스 중에 포함되어 있는 NO_x를 제거하기 위하여 선택적 촉매 환원법에 활용되는 촉매들의 특성을 조사하였다. 촉매는 V₂O_5, MoO₃, 그리고 SnO₂를 하니컴 형태의 TiO₂담체에 담지시켜 제조하였으며 촉매의 종류, 반응온도, feed의 조성, NH₃/NO 몰비의 영향 등이 반응특성에 미치는 영향을 실험실 규모의 반응기에서 조사하였다. 10% V₂O_5/TiO₂촉매가 350℃에서 94.4%의 높은 NO→N₂전환율을 보였으며 열적 안정성이 좋은 MoO₃의 첨가는 높은 전환율을 보이는 온도범위를 확장시켜 주었다. The characterization of catalysts for the selective catalytic reduction(SCR) was investigated to remove NO_x discharge from radioactive waste incinerator. The catalyst was prepared by impregnating V₂O_5, MoO₃, and SnO₂on honeycomb shaped TiO₂. The effects of the type of catalysts, reaction temperature, feed composition, and mole ratio of NH₃/NO on the reaction characteristics were evaluated in a laboratory scale reactor. The 10% V₂O_5/TiO₂ catalyst showed the highest NO to N₂conversion of 94.4% at 350℃ and the temperature range for higher conversion was broadened by adding thermally stable promoters, MoO₃.
강희석,이한수,정흥석,안도희,손순환,정양근,송명재 ( Hee Suk Kang,Han Soo Lee,Hongsuk Chung,Do Hee Ahn,Soon Hwan Son,Yang Geun Chung,Myung Jae Song ) 한국공업화학회 1996 공업화학 Vol.7 No.4
중수형 발전소에서 삼중수소 제거 공정에 이용되는 소수성 고분자촉매의 담체인 스티렌-디비닐벤젠 공중합체의 제조 특성을 실험하였다. 스티렌-디비닐벤젠 고분자담체의 제조시 담체의 표면 특성에 대한 용매의 영향을 고찰하기 위하여 일정한 용매계에서 용매비를 변화시켜 solvating power 값을 구하였다. 거시기공 형태의 담체가 제조되기 위한 solvating power는 가교도가 20%일 때 3 이상, 가교도가 40%일 때는 1 이상의 값이 필요하였으며 약 40℃에서 2시간 이상 용액의 안정이 필요하였다. 또한 후처리 방법은 담체를 건조시키기 전에 용매를 제거하는 방법이 가장 우수한 기공 특성을 나타내었다. 담체의 입자 크기는 교반속도 및 계면활성제의 농도가 낮을수록 더 크게 생성됨을 알 수 있었다. This study represents the synthetic characteristics of styrene-DVB copolymer which is used as a catalyst support for the removal of tritium in CANDU. To evaluate the effect of solvent on the styrene-DVB polymeric support, the solvating power dependent on various kinds and composition of solvents was calculated. In order to synthesize the macroreticular type polymer bead, the following conditions are needed; solvating power should be higher than 1 for 20% of crosslinkage and higher than 3 for 40% of crosslinkage. Stabilization of organic monomers at about 40℃ for more than 2 hours is prerequisite. Removal of solvent prior to drying is preferred for the post-treatment of the bead. The polymer particle size was increased by lowering concentration of surfactant and stirring speed.
이정민 ( Jung Min Lee ),박종철 ( Jong Chul Park ),구대서 ( Dae Seo Koo ),정동유 ( Dong You Chung ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2013 응용화학 Vol.17 No.1
With an increasing demand for energy, the importance of nuclear fusion energy is increasing. Hydrogen isotopes are a main fuel for nuclear fusion reactors. Metal hydride former offers a safe and convenient method for hydrogen isotope storage. The storage of hydrogen isotopes is carried out by absorption and desorption in a metal hydride bed. These reactions require heat removal and supply respectively. Accordingly, the rapid storage and delivery of hydrogen isotopes are enabled by rapid cooling and heating of the metal hydride bed. In this study, a vertical-type hydrogen isotope storage bed is manufactured to enhance the cooling performance. We present the experimental details of the cooling of the bed.
이지성 ( Ji Sung Lee ),구대서 ( Dae Seo Koo ),정동유 ( Dong You Chung ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2011 응용화학 Vol.15 No.1
Hydrogen isotope is a main fuel for nuclear fusion reactors like ITER (international thermonuclear experimental reactor). Metal hydride is considered for the storage of the hydrogen isotope. Hydrogen isotope absorption and desorption are carried out in a metal hydride bed. These reactions require heat removal and supply respectively. Therefore, rapid storage and delivery of tritium are enabled by rapid cooling and heating of the storage vessel. Rapid heating can be achieved with an electrical heater. However, rapid cooling is not easily achieved. A vertical type hydrogen isotope storage vessel containing 1250 g of ZrCo powder is designed to enhance the cooling performance. Two types of cooling method, an external helium circulation and an internal helium circulation loop, are proposed in this study. The transient cool down time from 350℃ to lower temperatures has been estimated. Details of heat transfer analysis and parametric study at each boundary condition are presented in this paper.
이정민 ( Jung Min Lee ),정동유 ( Dong You Chung ),구대서 ( Dae Seo Koo ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2012 응용화학 Vol.16 No.1
A nuclear fusion fuel cycle plant is composed of various subsystems such as a hydrogen isotope storage and delivery system. Metal hydride beds are used for storing hydrogen isotope. We thus present details on the bed of hydrogen isotope storage for nuclear fusion fuel plants. A small DU bed was designed, manufactured and inspected. The thermal shields for the primary vessel were manufactured to reduce heat transfer from the primary vessel to the secondary vessel, and thermal loss. Helium leak inspections on the parts of primary & secondary vessels were performed. These results proved to have no leakage on the parts of the primary & secondary vessels.
안도희,백승우,이한수,정흥석 ( Do Hee Ahn,Seung Woo Park,Han Soo Lee,Hongsuk Chung ) 한국공업화학회 1996 공업화학 Vol.7 No.3
여러 가지 중수생산 공정중에서 백금촉매를 이용한 수소-중수소 동위원소 교환반응에 의해 중수를 생산하는 공정이 가장 효율적인 것으로 알려져 있다. 본 연구에서는 수소동위원소 교환반응에 이용될 수 있는 소수성 백금촉매를 개발하기 위하여, 담체로서 실리카라이트를 합성하였으며, 합성된 실리카라이트가 활성탄이나 ZSM-5보다 더 강한 소수성을 가지는 것을 보였다. 또한, 일반적인 함침법과 이온교환법을 이용하여 백금을 담지시켰으며, 여러 가지 방법으로 처리하여 제조한 백금담지 실리카라이트 촉매의 백금분산도를 수소흡착법을 이용하여 측정하였다. 함침법에 의해 제조된 촉매의 백금분산도는 매우 낮았으며, 이온교환법에 의해 제조된 촉매는 백금담지량은 적으나 분산도는 높음을 확인하였다. It is well known that the heavy water separation process using hydrogen isotope exchange reaction over the platinum catalyst is the most efficient. In this study, the Pt/silicalite catalysts were prepared and characterized by hydrogen adsorption in order to develop the hydrophobic platinum catalyst for hydrogen isotope exchange reaction. Silicalite was synthesized as support material and it was verified that silicalite is more hydrophobic than activated carbon and ZSM-5. Also the platinum was loaded on silicalite by conventional impregnation and ion-exchange method respectively. The platinum dispersion of Pt/silicalite catalysts was measured through hydrogen adsorption experiment. The dispersion is very low in the catalyst prepared by the impregnation method while it is very high with limited platinum content in the catalyst prepared by the ion-exchange method.
이정민 ( Jung Min Lee ),정동유 ( Dong You Chung ),구대서 ( Dae Seo Koo ),정흥석 ( Hong Suk Chung ) 한국공업화학회 2011 응용화학 Vol.15 No.2
Filtration is the most widely utilized technique for air cleaning and sampling, and is applied in a variety of industries, such as respiratory protection, air cleaning of smelter effluents, processing of nuclear and hazardous materials, and particle collection in clean rooms. The purpose of this research is to improve the collection performance of filtration. This study was mainly focused on the characterization of filters and the way to maintain optimal performance of filtration.