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공경택,김홍곤 한국공업화학회 2003 응용화학 Vol.7 No.2
Preparation of 1,1,2,3,3,3-hexafluoropropyl methyl ether(HFE-356mec), a prospective foam blowing agent replacing CFC-11, has been studied under a basic condition. Etherification of hexafluoropropylene(HFP) withe CH₃OH occurrdd in a liquid phase having basic catalysts. Reaction temperatures lower than 30℃ produced high yields and high selectivities of the ether product. The effect of temperature indicated that the amount of HFP dissolved in methanol may play the major role to control the production rate of the HFE-356mec.
공경택,김홍곤 한국수소및신에너지학회 2011 한국수소 및 신에너지학회논문집 Vol.22 No.1
Sulfur-Iodine (SI) cycle, which thermochemically splits water to hydrogen and oxygen through three stages of Bunsen reaction, HI decomposition, and H_2SO_4 decomposition, seems a promising process to produce hydrogen massively. Among them, the decomposition of H_2SO_4 (H_2SO_4 = H_2O + SO_2 + 1/2 O_2) requires high temperature heat over 800℃ such as the heat from concentrated solar energy or a very high temperature gas-cooled nuclear reactor. Because of harsh reaction conditions of high temperature and pressure with extremely corrosive reactants and products, there have been scarce and limited number of data reported on the pressurized H_2SO_4 decomposition. This work focuses whether the H_2SO_4 decomposition can occur at high pressure in a noble-metal reactor, which possibly resists corrosive acidic chemicals and possesses catalytic activity for the reaction. Decomposition reactions were conducted in a Pt-lined tubular reactor without any other catalytic species at conditions of 800℃ to 900℃ and 0 bar (ambient pressure) to 10 bar with 95 wt% H_2SO_4. The Pt-lined reactor was found to endure the corrosive pressurized condition, and its inner surface successfully carried out a catalytic role in decomposing H_2SO_4 to SO_2 and O_2. This preliminary result has proposed the availability of noble metal-lined reactors for the high temperature, high pressure sulfuric acid decomposition.
Chlamydomonas reinhardtii명반응 증식 특성 및 암반응에서 수소 생산
박대원,공경택,김동건,김지성,박호일,조경숙 한국수소및신에너지학회 2005 한국수소 및 신에너지학회논문집 Vol.16 No.1
We experimented on growth in light and production of hydrogen and organic matters in dark fermentation by using C. reinhardtii. In the light, growth rate of C. reinhardtii following CO2 fixation was proportional to consumption rate of nitrogen source. And the starch in cell was accumulated more when the period of culture was lengthened more. But the accumulation rate of starch in cell was decreased when the growth rate of cell become dull. In the dark fermentation, the production volume and production rate of hydrogen were the highest value in the mid exponential state among other states. The utilization efficiency of substrate was better in the early exponential state than other states. In production of organic matters, acetic acid didn't change remarkably and ethanol showed the highest value in early exponential state.
전동근,이관영,공경택,유계상,김홍곤,정광덕,이병권,김창수 한국수소및신에너지학회 2008 한국수소 및 신에너지학회논문집 Vol.19 No.1
CuFeOx/Al2O3 catalysts are developed for the use in sulfuric acid decomposition which is a subcycle in thermochemical iodine-sulfur cycle to split water into hydrogen and oxygen. Both Cu and Fe components are co-precipitated with Al component to enhance distribution of active components. Developed catalysts are improved in the capability of sulfuric acid decomposition and endurance under highly acidic environment compared to commercial catalysts such as Pt/Al2O3 and 2CuOCr2O3. Developed CuFeAlOx catalysts exhibited higher sulfuric acid decomposition ability than 2CuOCr2O3 and longer endurance trends than Pt/Al2O3 maintaining comparable performance, respectively.