스피넬형 코발트 크로마이트 촉매상에서 삼염화에틸렌의 산화

임선기,김대철 전남대학교 촉매연구소 2001 觸媒硏究 論文集 Vol.22 No.-

이산화탄소 수소화 반응을 위한 촉매의 연구개발 현황

전종기,박영권,임선기 한국공업화학회 2003 공업화학 Vol.14 No.1

온실효과를 유발하는 이산화탄소는 매우 풍부한 탄소원이며 대기 중의 농도가 꾸준하게 증가하고 있다. 대기 중의 이산화탄소의 농도를 제어하기 위해서 이산화탄소를 화학반응을 통하여 유용한 화합물로 전환하는 기술이 집중적으로 연구되고 있다. 짧은 시간 내에 많은 양의 이산화탄소를 처리할 수 있다는 이점 때문에 이산화탄소의 수소화 반응이 가장 효과적인 공정으로 제안되고 있다. 금속/금속산화물 촉매 또는 금속/금속산화물과 제올라이트가 조합된 혼성촉매를 사용하여 이산화탄소와 수소로부터 함산소 화합물이나 탄화수소를 선택적으로 합성할 수 있다. 본 고에서는 메탄올, 파라핀, 올레핀, 디메틸에테르, 에탄올 등의 효율적인 합성을 위한 촉매의 최근 연구 및 개반 현황을 집중적으로 다루었다. Carbon dioxide, which causes greenhouse effect, is one of the most abundant carbon resources avaialble, and its concentration in the atmosphere has steadily increased. In order to control the concentration of carbon dioxide in the air, various kinds of technologies that transform carbon dioxide into useful products via chemical reactions have been studied intensively. Recently the catalytic hydrogenation of carbon dioxide has been proposed as one of the most effective processes because it can treat a large amount of carbon dioxide in a relatively short period of time. By using metal/metal oxide catalysts or hybrid catalysts composed of metal/metal oxide and zeolite, the selective synthesis of oxygenates or hydrocarbons from carbon dioxide and hydrogen was realized. In this review, recent researches and developments of catalysts for the effective synthesis of methanol, paraffin, olefin, dimethylether, ethanol and others are introduced.

담도결석의 임상적 연구

송인상,임철,손기섭 충남대학교 의과대학 지역사회의학연구소 1989 충남의대잡지 Vol.16 No.2

The chole lithiasis of the biliary system is one of the most common diseases which are hospitalized and treated surgically in the field of general surgery. A retrospective study of 175 patients who admitted and treated surgically with chole lithiasis at the department of general surgery of Chung-nam National University Hospital from March 1987 to September 1989 was performed. The results are as follow: 1. The peak incidence of chole lithiasis was 6th decade, 32.0% and followed by 7th decade, 20.0% and 5th decade, 17.7%, and the ratio of females and males is approximately 5:4. 2. The stones are most farequently found in the gall bladder 62.3%, and followed by in the common bile duct 56.6%, and in the intrahepatic duct 24.2%. 3. The most common symptoms and signs are pain, 96.6%, tenderness, 67.4%, and fever and chill 66.9%, and over 60% of patients were suffered from less than 3 months. 4. The results of culture shows the E.coli was found in 37.0% and klebsiella 12.3% of patients. 5. The laboratory finding reveals that moderated elevation of SGOT, SGPT, and alkaline phosphatase in about 40%, and 50% of patients. 6. The major operative procedures are cholecystectomy, choledochotomy and T-tube drainage in 49.1% of patients and cholecystectomy only in 32.9% of patients. 7. The major associated diseases are cholecystitis in 37.1%, cholangitis in 15.0% and gall bladder empyema in 12.0%. 8. The most common complication is wound infection n 12.0% of patients and followed by residual stone in 9.0% of patients. 9. The overall mortality rate is 1.2% and the causes of death are one case of sepsis and one case of bile peritonitis.

Isomerization of 1- Hexene Catalyzed over Polymer - Supported RuCl2 (PPh3) 3

Ihm, Son Ki,Ahn, Jou Hyeon,Jo, Young Do 한국화학공학회 1991 NICE Vol.9 No.6

Polymer-supported ruthenium catalyst was prepared by anchoring dichlorotris(triphenylphosphine) ruthenium, RuCl₂(PPh₃)₃, onto the phosphinated polystyrene bead. The polymer-supported RuCl₂PPh₃)₃ could be reused several times with only small loss of catalytic activity in the isomeriation of 1-hexene. The activity rather increased during the few initial runs. In both homogeneous and heterogenized catalysts, an induction period was required to initiate the isomerization. The catalyst efficiency was promoted in the mixture of good swelling solvent and potent hydrogen donor. Upon heterogenizing, the activity was reduced by a factor of 2.0-8.2.

Effect of Reaction Conditions and Catalytic Properties on Methanol Conversion over SAPO-34

Ihm, Son Ki,Park, Young Kwon,Baek, Se Won 한국공업화학회 2001 Journal of Industrial and Engineering Chemistry Vol.7 No.3

Methanol conversion was carried out over SAPO-34 catalysts at 400℃ and 1 atm to investigate the selectivity of the hydrocarbon products. SAPO-34 catalysts with different Si/Al ratios were modified by (hydro)thermal treatments, ammonia preadsorption, and/or TEOS CVD to change their catalytic properties. The change in acidity induced by these treatments did not seem to produce any significant changes in activity and selectivity, however the reaction parameters, including the partial pressure of methanol and presence of water in the feed, were found to influence the hydrocarbon product distribution by increasing the C₂ (especially ethene) selectivity.

Methylformate Formation from Methanol and CO on Cu/ZnO Catalysts

Ihm, Son Ki,Chung, Moon Jo,Park, Kun You,Lee, Byung Gwon 한국화학공학회 1994 NICE Vol.12 No.1

The reaction mechanism for the methylfortrate formation on Cu/ZnO catalysts from methanol and CO was investigated by the labeling study with ^(13)C methanol. It was found that methyl-formate could be formed through two parallel reaction routes, i.e., methanol-formaldehyde reaction and carbonylation of methanol depending upon the catalyst composition as well as the reaction conditions. The major reaction route on the high ZnO-content catalyst(Cu/ZnO = 30/70) was found to be the methanol-formaldehyde reaction, and changed to the carbonylation reaction with the increase of CO partial pressure. On the other hand, the major reaction route on the high Cu-content catalyst(Cu/ZnO = 80/20) remained as methanol-formaldehyde reaction even under the high CO pressure.

Tetradentate Schiff Base Ruthenium (Ⅱ) Carbonyl Complexes: Synthesis, Characterisation, Catalytic and Antibacterial Studies

Son-Ki Ihm,T. Daniel Thangadurai 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.5

Effect of Carbon Deposits on the Properties of Co/Y - Zeolite Catalysts for CO Hydrogenation

Ihm, Son Ki,Lee, Dong Keun 한국화학공학회 1989 NICE Vol.7 No.1

Co/Y-zeolite catalysts were prepared by three different preparation methods of excess-water (EW), ionexchange (IE) and carbonyl complex-impregnation (CI), and they were deposited by carbon through the dispropotionation of carbon monoxide at different temperatures. CO hydrogenation was performed on the fresh and arbon deposited Co/Y-zeolite catalysts respectively, and the results were compared with each other. CO hdrogenation was carriet out in a differential reactor operating at atmospheric pressure, temperature of 270-400℃ and H₂/CO ratio of 2. Temperature programmed surface reaction (TPSR) of carbon deposits eva performed in a thermogravimetric flow system to obtain a better understanding of the carbon deposits. Che large cabala metals existing mainly at the exierior surface of zeolite crystals in the EW catalyst had a great affinity to carbon deposits, but the small cobalt metals in the IE and CI ones were highly resistant to carbon deposits. The hydrocarbon product distributions were hardly affected by carbon deposits, while the production of olefinic hydrocarbons was enhanced significantly.

Characteristics of Bimetallic Cobalt and Molybdenum Catalysts Supported on Activated Carbon or Alumina in Hydrodesulfurization

Ihm, Son Ki,Moon, Sang Jin 한국화학공학회 1994 NICE Vol.12 No.4

A series of bimetallic cobalt(Co) and molybdenum (Mo) catalysts supported on activated carbon or alumina were prepared and their activities in thiophene hydrodesulfurization and ethylene hydrogenation were ompared. The nitric oxide(NO) chemisorption and temperature programmed desorption(TPD) were used to ctraracterize the nature of the synergistic active sites. Carbon supported catalysts also demonstrated the synergism in activity, which is well known for alumina supported catalysts. The specific activity and the adsorption stoichiometry of each site were interpreted from NO chemisorption. The possibility of NO as a probe molecule for sulfide catalysts was provided by the present work.

EFFECT OF ACTIVE SITE DISTRIBUTION ON LIQUID-PHASE OLEFIN HYDROGENATION OVER POLYMER-SUPPORTED PALLADIUM COMPLEX

Ihm, Son Ki,Ahn, Jou Hyeon,Jo, Young Do 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.2

Chloromethylated polystyrene beads with different distributions have been prepared and phosphinated. PdCl₂was supported on the phosphinated supports to give polymer-supported Pd complex catalysts with different active site distributions. The effect of active site distribution on catalytic activity was investigated in the hydrogenation of olefins.