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Kinetic Studies on Halogen Exchanges of 2-Naphthylmethyl Chloride
Yie, Jae Eui,Lee, Ik Choon,Kim, Wang Ki,Lee, Kae Soo 亞州大學校 1978 論文集 Vol.2 No.-
염화 2-나프틸메틸의 할로겐 교환반응을 아세톤 및 아세토니트릴 용매내에서 실시 하였다. 실험결과는 PMO 이론과 HSAB 원리로 잘 설명할 수 있었다. The halogen exchange reactions of 2-naphylethyl chloride have been investigated in actone and acetonitrile. The results were in good accord with PMO theory and HSAB principle.
이재의 한국화학공학회 1984 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.22 No.2
탄소 표면산소착물이 탄소의 수소화 반응에 미치는 영향을 연구하였다. 또한 칼리움 염의 작용에 대해서도 연구하였다. 표면산소착물은 CO와 CO₂로 분해, 탈착되며, 매우 활성이 큰 표면 탄소를 생성하는 것 같다. Temperature-Programmed반응을 101kPa수소하에서 행한 결과 이들 표면탄소는 결정성이 큰 탄소보다 월등이 높은 반응성을 나타내었다. CH₄ 생성에 대한 활성화 에너지는 75∼85 kJ/mone로서 Ni촉매하에서의 carbidic탄소 수소화 반응에서의 값과 거의 같았다. 칼리움염은 CH₄의 생성을 촉진하는데, 이것은 칼리움 염이 표면산소착물과 작용하여 이들의 탈착을 촉진시키기 때문인 것으로 생각된다. A detailed study has been conducted on the effects of carbon surface oxides and added potassium salts on the hydrogenolysis of carbon. Carbon surface oxides were decomposed and desorbed in the forms of CO and CO₂. The resulting surface carbons were much more reactive than the well crystallized carbons as measured by temperature-programmed reaction in 101 kPa H₂. The activation energies for CH₄ formation were estimated as 75-85 kJ/mole and they were about the same order of magnitude for Ni catalysed carbidic carbon hydrogenation. Added potassium salt accelerated the formation of CH₄ at low temperatures. It seems to be enhanced desorption of carbon surface oxides by the potassium-surface oxide interaction.
Pt 담지 촉매의 새로운 제법 및 Coke 형성에 관한 연구
이재의 亞洲大學校 1989 論文集 Vol.12 No.-
Instead of conventional hydrogen reduction, methane treatment has been used to reduce platinum oxide for the purpose of making new coke-resistible Pt catalyst. The surfaces of these catalysts have been characterized by specific chemisorption and ESCA. Methane-treated catalyst has smaller surface area than hydrogen-treated one and the moderate treatment temperature gives both large surface area and minimum carbon deposit. At lower temperature(573K) the oxide is not completely reduced and at higher temperature(723K) lots of coke is deposited. Using hydrogen TPR, two types of surface coke have been identified. One is more reactive carbidic carbon, and the other is less reactive graphitic one. The presence of graphitic and carbidic carbons is also confirmed by ESCA.
이재의,윤기준,민경택,강문규 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.6
알루미나 담지 백금 촉매를 1% CH₄-N-2 기체로 573K, 673K 및 723K에서 처리하였을 때의 촉매 활성화에 대하여 조사하였다. 처리하는 동안 유출기체의 성분을 분석한 결과 H₂와 CO₂ 발생이 관찰되었다. 673K에서 메탄처리한 촉매의 H₂ 및 O₂ 흡착량이 가장 높았으며, 수소처리한 촉매의 흡착량의 65%에 달했다. 573K에서는 촉매중의 산소가 별로 제거되지 않았고, 723K에서는 탄소퇴적이 많이 일어나서 흡착량이 작은 것으로 생각된다. 673K에서 메탄처리한 촉매와 수소처리한 촉매에 대하여 시클로프로판 수소 첨가반응을 273K, 상온, 328K에서 수행하였는데, 비활성화속도는 온도가 높을수록 증가하였으며, 메탄처리한 촉매는 수소처리한 촉매와 비활성화 양상이 크게 다르지는 않았다. Activation, of an alumina-supported platinum catalyst by methane treatment was investigated. The treating gas contained 1% CH₄ in N₂ and the treatment temperatures were 573, 673, and 723 K. The effluent gas was analyzed during the treatment and the evolution of H₂ and CO₂ was observed. The amounts of chemisorbed H₂ and O₂ were the largest on the catalyst treated at 673 K, and they amounted to 65% of the amounts chemisurbed on the hydrogen-treated catalyst. It is considered that at 573 K the oxygen in the catalyst was not removed sufficiently and that at 723 K a large amount of carbon deposit was built up. Hydrogenation of cyclopropane was carried out at 273 K, room temperature, and 328 K over both the catalyst treated with methane at 673 K and the catalyst treated with hydrogen. The deactivation rate increased with increasing temperature, and the deactivation pattern of the methane-treated catalyst did not appear to be different from that of the hydrogen-treated catalyst.
이재의,윤기준,정경숙 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.5
Ni/SiO₂촉매를 사용하여 온도 473-553 K, 메탄올 분압 0.141기압 이하의 범위에서 관형 흐름반응기를 사용하여 메탄올 분해반응을 수행하였다. 주 생성물은 H₂와 CO이었으며, 부산물로 소량의 CH₄가 생성되었다. CH₄ 생성량은 온도가 높아짐에 따라 점차 증가하였으나 CO의 선택도가 95% 이상을 나타내었다. 다음과 같은 분해반응속도식을 제안하고 실험 자료로부터 반응속도론적 매개변수값을 결정하였다. -r_A=k_s K_A P_A/(1+K_A P_A)² Decomposition of methanol over a Ni/SiO₂ catalyst was carried out using a tubular flow reactor in a temperature range between 473 and 533 K. The partial pressure of methanol was below 0.141 atm. H₂ and CO were the major decomposition products, and a small amount of CH₄ was produced. Although the amount of CH₄ formed increased with temperature, the selectivity to CO was greater than 95%. The following rate equation was proposed and the kinetic parameter values were evaluated. -r_A=k_s K_A P_A/(1+K_A P_A)²
이재의,김기영,김재헌 한국공업화학회 1998 응용화학 Vol.2 No.1
In order to maintain the freshness of fruits and vegetables, controled atmosphere(C.A) storage has been used for a long time. But the ethylene gas produced by breathing of fruits and vegetables makes them hard to keep the freshness, promotes the aging of them. In this study, adsorption behavior, adsorption amount and adsorption equation of ethylene gas in low concentration by using activated carbon were studied. It was observed that the amount of adsorption was increased with more activated carbon and with slower flow rate. But it was not explained with Henry's equation and Freundlich's equation. Therefore more study will be necessary about the equation of adsorption and adsorption phenomena.
An XANES Study of Carbides of Molybdenum and Tungsten
Lee, Jae Sung,Yie, Jae Eui 한국화학공학회 1991 NICE Vol.9 No.6
The X-ray absorption near edge structure (XANES) of molybdenum and tungsten compounds has been studied by using synchrotron radiation. Substantial difference in XANES features between metals and their carbides suggested significant difference in electronic structure between them. The shift in edge position indicated charge transfer from metal to carbon when a carbide is formed. In light of a modern band theory, the larger white line areas for carbides could be interpreted as due to some of the unoccupied dstates which are not measured by x-ray white line area.
AN XANES STUDY OF CARBIDES OF MOLYBDENUM AND TUNGSTEN
Lee, Jae Sung,Yie, Jae Eui 한국화학공학회 1991 Korean Journal of Chemical Engineering Vol.8 No.3
The X-ray absorption near edge structure (XANES) of molybdenum and tungsten compounds has been studied by using synchrotron radiation. Substantial difference in XANES features between metals and their carbides suggested significant difference in electronic structure between them. The shift in edge position indicated charge transfer from metal to carbon when a carbide is formed. In light of a modern band theory, the larger white line areas for carbides could be interpreted as due to some of the unoccupied d-states which are not measured by x-ray white line area.