미세한 鐵 粒子上의 CO 화학흡착 속도

尹奇俊 成均館大學校 科學技術硏究所 1985 論文集 Vol.36 No.1

CO chemisorption rate data on highly-dispersed iron particles in a temperature range of 300-473。K were analyzed in terms of chemical reactors occurring on the surface for elucidation of chemisorption mechanism and structures of final chemisorbed species. The final structure varied depending on temperature and the chemisorption was interpreted to proceed via initial rapid formation of linear-type CO to a final structure. The final structures suggested were a subcarbonyl type at 300˚K, laying-down CO at 373˚K, and dissociated CO at 473˚K.

SILICA 및 ALUMINA 擔持 鐵觸媒의 H_2 및 CO 化學吸着 特性

尹奇俊,金寅泰,崔祉勳 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.2

H_2 and CO chemisorption experiments were performed on silica-and alumina-supported iron catalysts and the chemisorption characteristics of H_2 and CO were compared. Effects of the supports on the chemisorption characteristics, dispersion, and reducibility of the catalysts were also compared. In addition, effects of the metal loading and the methods of catalyst preparation were investigated. The catalysts were prepared by the incipient wetness method with varying preparation conditions and Fe loadings. The adsorption experiments were carried out at various temperatures from 195K to 473K. Oxidation of the catalysts were performed in order to determine the degree of reduction of Fe. The results were as follows : (1) The amount of CO chemisorbed on the silica-supported catalysts decreased with temperature. That on the alumina-supported catalysts decreased with temperature up to 373K, but it became larger at 473K. (2) The amount of chemisorbed H_2 increased with temperature up to 473K for all the catalysts. The amount of chemisorbed H_2 was much lower than that of CO chemisobed at 195K. (3) The percentage reduction of the silica-supported catalysts was higher than that of the alumina-suppoted catalysts. The dispersion of the silica-supported catalysts was lower than that of the alumina-supported catalysts. (4) The catalysts perpared by different methods did not show different chemisorption characteristics, but exhibited different dispersion or percentage reduction.

Cu/Kieselguhr 觸媒에 依한 Acrylonitrile의 水和反應에 關한 硏究

尹奇俊,姜喆象 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.2

Catalytic hydration of acrylonitrle over Cu/kieselguhr catalysts was studied at 343K. The catalysts with varying Cu loadings were prepared by the precipitation method using NaOH and K_2CO_3 solutions as the precipitants. The active surface areas were measured by O_2 chemisorption at 77K in order to determine the areal reaction rate constants. Some effects of the precipitant and the Cu loading were investigated. The results were as follows : (1) Only acrylamide was produced over the catalysts prepared using NaOH, whereas ethylene cyanohydrin was also produced over the catalyst prepared using K_2CO_3. (2) The reaction rate for the production of acrylamide was first order with respect to the concentration of acrylonitrile. (3) The areal reaction rate constant. for the catalysts prepared using NaOH decreased significantly with decreasing Cu loading. The constant at 343K for the catalyst having 50% Cu loading was 2.83 x 10 wxp(-6)l/㎡. min.

擔持된 철-루테늄의 化學吸着 特性

尹奇俊 成均館大學校 科學技術硏究所 1986 論文集 Vol.37 No.1

Chemisorption characteristics of hydrogen and CO on a Fe-only catalyst was different from that on a Ru-only catalyst, and this was utilized for determination of surface compositions of Fe-Ru alloy catalysts. The chemisorption characteristics also depended upon pretreatment conditions of the alloy catalysts. The results were summarized as follows: (1) The structure of the alloys obtained under mild pretreatment at 200℃ was considered to be metastable, while it became stable after more severe pretreatment at 400℃ (2) CO chemisorbed on both Fe and Ru in the matastable alloys was in the linear form, and the hydrogen chemisorption on the Ru was somewhat depressed. The chemisorption characteristics on the stable alloys was essentially the same as that on Fe--only and Ru-only catalysts, but formation of bridged CO on Fe in the alloys having high Re content was inhibited due to a geometric requirement. (2) The surface composition of Fe was higher compared to the bulk composition for all the alloys, and it become higher for the stable alloys than for the metastable ones. This is consistent with the fact that Fe has a lower surface energy than Ru.

Cu/SiO_2 촉매에 의한 메탄올 분해반응

尹奇俊,金聲根 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.1

Decomposition of methanol over a Cu/Si0_2 catalyst under total pressure of 1 atm was investigated in a temperature range between 563 and 643K using a tubular flow reactor. Besides CO and H_2 as the decomposition products large amounts of HCHO and CO_2 were observed. Deactivation rate of the catalyst was considerably fast. It was concluded that CO_2 was formed mainly from CO by the Boudouard reaction and that accompanying carbon deposition was the cause of the deactivation. Overall conversion of methanol increased with increasing temperature up to 603K and then decreased with further increase of temperature ; the rate of CO formation varied in a similar trend. This is considered due to that at higher temperatures carbon deposition occurs more rapidly, resulting in blocking of a singificant portion of the catalyst surface within a few minutes. With increasing temperature the selectivity to CO_2 decreased and the selectivity to HCHO increased. This indicates that formation of CO_2 is a structure-sensitive reaction whereas formation of HCHO is a less structure-sensitive one.

鐵 觸媒上의 벤젠 水素添加 반응의 反應機構에 대한 考察

尹奇俊 成均館大學校 科學技術硏究所 1984 論文集 Vol.35 No.2

The experimental data reported in the literature on the benzene hydrogenation over an iron catalyst were re-analyzed and a reaction mechanism, in which the rate-determining step is the surface reaction of a chemisorbed partially-hydrogenated benzene with a chemisorbed hydrogen atom, was discussed. The derived rate equation of the following form, r = (k'K_EK_BK_H^5/2P_BP_H2^5/2) / (1 + K_BP_B)^2 provided a satisfactory fit of the data below 453 K, and the kinetic parameter values obtained were more reasonable than those in the original paper. The decrease of the reaction rate above 453 K could be explained by the marked decrease of the amount of the chemisorbed hydrogen or of the chemisorbed benzene.

Cu/ZnO 촉매에 의한 Acrylonitrile의 水化反應

金基泰,尹奇俊,鄭泰秀 成均館大學校 科學技術硏究所 1987 論文集 Vol.38 No.1

Acrylamide was prepared by catalytic hydration of acrylonitrile. In the process of hydration of acrylonitrile, ethylene cyanohydrine was produced as a by-product. Cu/ZnO was used as the catalyst for the reaction. Cu/ZnO was prepared by reduction of Cu/ZnO with hydrogen flowing at 350℃. The reaction was carried out in the suspension of the pretreated catalyst. A simple batch reactor was used with reaction times of several hours at 70℃, 60℃, and 50℃. The results of this study are as follows: 1. The catalytic hydration of acrylonitrile is a pseudo first-order reaction. 2. The reaction products were acrylamide and ethylene cyanohydrin. The selectivity of ethylene cyanohydrin with the Cu/ZnO used in this experiment was higher than those with such catalysts as Cu, Cu/ZnO, Cu/MgO, and copper chromite which had been used by other workers. 3. The reaction rate equations are as follows: -r_AN = 9.42 x 10 exp(4)·e^[(-13,000)/RT]·C_AN(mole/l·min) r_AM = -8.68 x 10 exp(6)·e^[(-17,500/RT]·C_AN(mole/l·min) r_ECH = 4.29 x l0 exp(3)·e^[(-11,200/RT]·C_AN(mole/l·min)

『金匱要略』의 重要 註釋書에 대한 硏究

廉龍河,河基泰,玄東煥,尹相柱,金俊錡,崔達永 동국대학교 한의학연구소 2000 東國韓醫學硏究所論文集 Vol.9 No.-

「금궤요약」은 韓醫學 最高의 雜病專門書로서 그 중요성이 널리 인정되고 있지만, 우리나라에서는 그에 대한 註解나 연구가 미흡한 실정이다. 따라서 著者는 앞으로의 硏究와 敎育의 基本資料로 삼기 위하여 本書의 重要 註繹書에 대하여 정리하였다. 「금궤요약」에 대한 최초의 注繹은 元明間趙良仁의 「금궤요약연의」「개정금궤요약주」等이 유명하다. 日本에서는 「금궤요약주해」을 효시로 「금궤요약방론친주」, 「良沙正經證匯」, 「금궤요약집성」, 「금궤요약집의」, 「금궤옥함요약술의」등의 注本이 있다. Jinguiyuolue(금궤요약), written by Zhong-Jing Zhang(張仲景) in late Han(漢) Dynasty, is very foundamental Cannon of Oriental Medicine. Many Doctors commented on the book from Yuan(元) Dynasty ir! Chian and from Edo(江戶) Period in Japan, but there are a few studies in Korea. So we studied on the commentaries of the book, which published in the three countries, for improving research and education of it in our country.

『金匱要略』과 『傷寒論』의 相似條文에 대한 分析

廉龍河,河基泰,玄東煥,尹相柱,金俊錡,崔達永 동국대학교 한의학연구소 2000 東國韓醫學硏究所論文集 Vol.9 No.-

『傷寒論』과 『金匱要略』은 仲景의 著述로서 醫方之祖 인정되어 왔지만, 두 책의 관계에 대해서는 오랫동안 논란이 있어 왔다. 그러나 『金匱要略』과 『傷寒論』의 相似條文은 각 책의 108%, 11%를 차지할 만큼 많이 있으며 각 조문을 분석한 결과 높은 상동성을 가지는 조문이 전체의 63.9%를 차지하고 있는데, 이것은 두 책이 서로 동일한 근원에서 나왔음을 보여준다. 따라서 『傷寒論』과 『금궤요략』의 관계를 이해함에 있어서 이들 相似條文에 대한 인식이 반드시 선행되어야 할 것으로 생각된다. Shanghanlun and Jinguiyaolue has the analogous text by the rate of 10.8% and 11.3% respectively. And We have found that 63.9% of them are very similar by the analysis on the analogous text. It is supposed that the Books are originated by same source. So we suggest that the analogous text is very important to understand the relationship of the Books.

순비기나무 (Vitex rotundifolia L. f.) 삽수 종류 및 생장조정제 처리에 따른 발근율

Jeong Yeob Kim,Yoon Ki Hong,Song Hee Ahn,Jung Seob Moon,Eun Seok Park,Hee June Kim 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.05

Background : This study was conducted to developed the propagation method by cutting for mass cultivation of Vitex roundifolia. We were pitched the cutting two times and treated plant growth regulators to enhance the rooting percentage. Vitex roundifolia is live in beach sandy soil south of Hwanghae-Do and Gangwon-Do. Vitex roundifolia have been used to bath foam. It is good for aromatic plant. It has 0.8% essential oil content in leaf and flower. Major components of essential oil were alpha-Pinene, Sabinene, beta-Pinen, 1,8-cineole, d-Limone. Despite the superior usability, it had not yet been made by the artificial cultivation Methods and Results : We were pitched the cutting of a first-year branch on June 5, which was greenwood cutting and July 17, which was semi-hardwood cutting at Kwangseung-ri beach, Gochanggun, Jeonbuk. The length of cutting was 10cm. It had 3~4 nodes, we stuck a cutting remain 2 nodes above ground on ordinary raise seedling soil. Rooting percentage was measured at 60 days after stuck a cutting. Rooting percentage was higher greenwoody cutting(95%) than semi-hardwood cutting(57.6%). In green wood cutting, there was no significance with plant growth, but chemical injury was occurred in IBA 5,000ppm. In semi-hardwood cutting, there was significance with plant growth regulators. The rooting percentages of all the treat were higher than control(no treatment). Rooting percentage was the highest in NAA 5,000ppm treated. Conclusion : Greenwood cutting method was more proper to propagation for Vitex roundifolia than semi-hardwood cutting. The optimum time to cutting for Vitex roundifolia propagation was the early in June. If miss a time to propagation Rooting percent was elevated by plant growth regulator.