우수 대학연구소 탐방-한밭대학교 '에너지청정기술연구소'

이원묵,Lee, Won-Muk 한국대학교육협의회 2005 大學敎育 Vol.134 No.-

담지된 Ru계 촉매상에서 n-Heptane의 Hydrocracking반응의 반응속도론적 연구

이원묵 大田工業大學 1991 한밭대학교 논문집 Vol.8 No.1

The hydrocracking and hydroisomerization of n-heptane were studied over Ru/La-Y based catalysts, and as an experimental apparatus a Catatest minipilot licensed by IFP was used in this study. Co and Ni were used as promoters and methylene chloride was used as an additive, so the effects of promoters impregnated into the prepared catalyst and of an additive were observed. A kinetic analysis of hydrocracking by the LHHW model indicated that the reaction orders were between 0.8 and 1 with respect to the partical pressure of n-haptane and were between -0.5 and -0.8 with respect to the partial pressure of hydrogen and the activation energies were between 10 and 40 kcal/g-mol. And the heats of adsorption of n-haptane and hydrogen were calculated.

이온교환과 침전법에 의하여 제조된 TiO_2 광촉매의 물성과 광촉매 효과

이원묵,배선길,허정반,김동진 한밭대학교 에너지청정기술연구소 2001 에너지청정기술논문집 Vol.1 No.1

표면적 증가시키고, 보다 작은 입자 크기와 적절한 band gap 에너지를 갖도록 이온교환법과 졸-겔법을 이용하여 TiO_2를 기조로한 광촉매를 제조하였다. 제조된 촉매는 UV-DRS, XRD, XRF, Particle Size analyzer(Laser), B.E.T surface area analyzer 등을 이용하여 band gap energy, structure, 입자크기, 조성등 물성 측정을 하였다. 침전법을 이용하여 sol상의 nano-sized TiO_2 based photocatalyst를 제조할 수 있었으며, 이는 같은 방법으로 제조된 powder 촉매보다 활성이 크게 향상되었으며, 이는 quantum yield가 증가되어 활성이 증가되는 것으로 해석된다. 한편 Bentonite를 기조로 한 이온교환 법에 의하여 제조된 TiO_2/Bentonite 광촉매는 표면적을 5배 이상 증가시킬 수 있었고, 침전법에 의하여 제조된 촉매와 근사한 3.0 eV이내로 band gap 에너지를 낮출 수 있지만, 촉매활성도는 sol 촉매보다 낮게 나타났다. 본 연구에서 제조된 모든 TiO_2촉매는 모두 anatase 구조를 갖고 있었고, 본 실험 조건에서는 다른 구조를 발견할 수 없었다. Photocatalysts based on titania were prepared through a ion-exchange method and sol-gel methods in order to increase their surface area, decrease the particle size and to produce the desired band-gap energy. TiO_2/Bentonite photocatalysts were prepared by ion-exchange method with TiCl_4 solution and sol-gel method were employed to prepare nanometer-sized sol and dried particle catalysts. They were characterized with UV-DRS, XRD, XRF, Particle size analyzer(Laser), B.E.T. Surface area analyzer. The sol-phase nanometer-sized TiO_2 based catalyst has highest external surface area and smallest crystallite size of anatase, and exhibited the highest photocatalytic activity for the decomposition of 2-propanol. And it had the similar band-gap energy of below 3.0eV as the catalyst by the precipitation method. Also all TiO_2 catalysts prepared in this study had no other structure than the anatase structure on the experimental conditions. HTsol-15 had the highest activity in this experiments, constant reaction rate in the reaction conditions and no deactivation.

技術開發과 産業財産權

이원묵 대전산업대학교 산업과학기술연구소 1999 기술교육연구지 Vol.7 No.-

Ru/La-Y촉매의 Methylene Chloride 흡착에 의한 산도분포와 Hydrocracking반응 특성변화에 대한 연구

이원묵 大田工業大學 1991 한밭대학교 논문집 Vol.8 No.1

The hydrocracking and hydroisomerization of n-heptane were studied over Ru/La-Y based catalysts, and as an experimental apparatus a Catatest minipilot licensed by IFP was used in this study. The effect off chlorine adsorption on the catalyst surface was observed by using lwt% methylene chloride, the reactional optimum concentration of additive. The activity of each catalyst was enhanced by more than 50% over its initial activity and the secondary splitting was also greatly increased. The increase of Lewis acidity by chlorine adsorption on the catalyst increased the selectivity of hydrocracking, in addition, the Bro^¨nsted acidity increased the selectivity of isomerization. Through an experiment on the deactivation of catalysts, it was confirmed that coke formation on the catalyst surface and sintering of active sites deactivated the catalysts. In a study of the turnover number of each catalyst used in hydrocracking, it was revealed that all of the reactions were structure-sensitive.

정수처리시 알루미늄계 응집제 사용에 따른 탁도와 잔류알루미늄 농도의 변화

이원묵,김기두 한국공업화학회 1997 응용화학 Vol.1 No.2

거의 모든 정수장에서 탁도를 제거하기 위해 응집, 침전공정을 행한다. 정수 처리과정에서 황산알루미늄(Alum)과 폴리염화알루미늄(PAC)과 같은 응집제를 사용하여 잔류알루미늄농도가 증가하는 것으로 알려졌다. 따라서 Jar-test를 사용하여 응집에 영향을 미치는 여러 요인들 중 잔류탁도와 잔류알루미늄농도를 최소화 할 수 있는 최적조건을 찾고자 하였다. 그 결과는 다음과 같다. Alum과 PAC 20∼30㎎/ℓ범위에서 잔류알루미늄농도는 0.128∼0.178㎎/ℓ 검출되어, 처리수의 잔류알루미늄농도 감소를 위해서는 응집제의 최적 주입률 결정이 중요한 것으로 나타났다. Almost the purification plants are accomplished coagulation sedimentation for removing the turbidity. It has been known that the concentration of residual aluminum increases during the purification treatment due to aluminum sulfate and poly aluminum chloride, which are being used as a coagulant. We intended to find the optimal condition to minimize the concentration of residual turbidity and aluminum using jar-test with the various condition affecting the coagulation. The results were as follows. The residual aluminum concentration is detected 0.128㎎/ℓ∼0.178㎎/ℓ at the range of 20∼30㎎/ℓ for Alum and PAC. Thus, it is important that the optimal dosage of coagulant can be decided to decrease the concetration of residual aluminum in purified water.

행사보고 : 제2회 대학생 화학공학 경연대회

이원묵 한국화학공학회 2003 NICE Vol.21 No.3

AlCl₃-CuSO₄혼합물 촉매상에서 n-Pentane의 이성화반응에 관한 연구

김경림,심재희,이원묵 연세대학교 산업기술연구소 1985 논문집 Vol.17 No.1

The study was concerned with n-pentane isomerization over mixtures of anhydride AlCl₃- CuSO₄and the reaction was studied in a batch type reactor. The catalysts in the reaction were made by the dehydration of anhydride aluminium chloride and crystallic cupric sulfate. The purpose of this study was to determine the rate of reaction and the order with varying catalyst composition and temperature. The reaction was zero order with respect to the concentration of n-pentane. The activation energy was 14.5 Kcal/mole.

농공단지 조성에 따른 하천 수질관리 대책에 관한 연구 : 충청남도 지역을 중심으로

이원묵,양천회,오재원 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.1

ABSTRACTA study of stream pollution caused by construction of the Industrial Complex in Agricultural Area of Chung Chong Nam Do were described here. The five main results of this studies are summerized.First, since 1988, among the companies moved in the industrial complex area, the number of electric and electronic companies have increased compared with food companies requiring much BOD, This is very desirable to reduce the water pollution.Second, the average Biochemical Oxygen Demand(BOD) of Masan stream was the highest and it was decreased in the order of Yudug, Jo and Jangan stream.Third, although the concentration of heavy metals such as Cd and Cr6+ are not off the limit and the amount of it is small, it is desirable to introduce a chemical process to remove these metals.Fourth, since the wastewater from industrial complex area is the major factor in stream pollution, the laws associated with environmetal protection should be enforced even then if the industrial complex area with food and chemical companies produce wastewater less than 500 ton/day.Fifth, it is required to improve a facilities whicli separate living wastewater from inderstrial wastewater in Kaya-gok and Nojang industrial complex area. A study of stream pollution caused by construction of the Industrial Complex in Agricultural Area of Chung Chong Nam Do were described here. The five main results of this studies are summerized. First, since 1988, among the companies moved in the industrial complex area, the number of electric and electronic companies have increased compared with food companies requiring much BOD, This is very desirable to reduce the water pollution. Second, the average Biochemical Oxygen Demand(BOD) of Masan stream was the highest and it was decreased in the order of Yudug, Jo and Jangan stream. Third, although the concentration of heavy metals such as Cd and Cr^6+ are not off the limit and the amount of it is small, it is desirable to introduce a chemical process to remove these metals. Fourth, since the wastewater from industrial complex area is the major factor in stream pollution, the laws associated with environmetal protection should be enforced even then if the industrial complex area with food and chemical companies produce wastewater less than 500 ton/day. Fifth, it is required to improve a facilities which separate living wastewater from inderstrial wastewater in Kaya-gok and Nojang industrial complex area.

信用社會 具現의 劣兵

李元默 전남대학교기업경영연구소 1992 經營情報 Vol.3 No.2

오늘날 경제활동의 범위가 점차 넓어지고 개별기업의 규모가 확대되어 감에 따라 “신용”이라는 말이 광범위하게 쓰여 지고 있다. 신용의 개념은 경제활동의 주체 따라 여러 가지로 정의할 수 있으나 일반적으로 “신용이란 장래의 어느 시점에서 그 대가를 지급할 것을 약속하고 현재의 경제적 가치를 획득할 수 있는 능력의 정도”라고 정의할 수 있다.