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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society of Clean Technology
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Volume & Issues
Volume 16, Issue 4 - Dec 2010
Volume 16, Issue 3 - Sep 2010
Volume 16, Issue 2 - Jun 2010
Volume 16, Issue 1 - Mar 2010
Selecting the target year
Synthesis of a Fluorene Carbonate from Fluorenyl Epoxide Using Supercritical Carbon Dioxde
Sim, Yun-Soo ; Shim, Jae-Jin ; Ra, Choon-Sup ;
Clean Technology, volume 16, issue 4, 2010, Pages 239~244
The carboxylation of the fluorenyl epoxide with a spiro framework, 9,9'-Bis(4-oxiranylmethoxyphenyl) fluorine (2) was catalyzed by some onium salts such as quaternary ammonium and phosphonium salts to produce the corresponding five-membered cyclic carbonate (3) in an efficient and environmentally benign fashion. The coupling reactions depend greatly on the kind of the halide anions and alkyl chain length of the onium salts. While the reaction was sensitive to the reaction temperature, the reaction trends suggest that the catalytic efficiency of the quaternary ammonium halides may correlate strongly with the melting points of the halides. The reactions using a catalytic amount (2 mol %) of quaternary ammonium bromide with an n-butyl chain at 75.9 bar of
and 393 K give the highest yield of the cyclic carbonate (92%).
UV-Curing System for the Filament Winding of Large Diameter Pipe
Choi, Jae-Wan ; Kim, Se-Il ; Chung, Yong-Chan ; Chun, Byaung-Chul ;
Clean Technology, volume 16, issue 4, 2010, Pages 245~253
Optimum conditions for UV-radiated photopolymerization of unsaturated polyester that could be used as protecting layer of large diameter pipe were investigated in this paper. UV photopolymerization method was selected to solve the problems, arising when thermal polymerization by organic peroxide was used, such as the instability of peroxide initiator, the evolution of volatile organic compound, and thermal deformation of product. Two of the photo-initiators (Irgacure 819 and Darocure 1173) well known for its penetrating ability deep into the polymer layer were selected, and the optimum conditions for photopolymerization (1.5 phr initiator content, 1:1.2 initiator ratio, Ga lamp for UV source) were found from the thermal and mechanical test results of the resultant UP polymers. In addition, composite materials containing UP polymer and glass fiber were tested for hardness, impact strength, and flexural strength to find that the impact strength of composite significantly improved.
Effect of Hydrothermal Treatment on Sulfur Dioxide Absorption Efficiency of Natural Brucite
Kim, Jin-Bae ; Kang, Seong-Gu ; Kim, Heon-Chang ;
Clean Technology, volume 16, issue 4, 2010, Pages 254~257
]slurry was prepared by using natural mineral brucite exploited from Liaoning province in China, and its de-SOx efficiency was examined. The effect of difference in particle size distribution of brucite and activation by hydrothermal treatment were investigated. The de-
efficiency of a finely-milled brucite sample below 1000 mesh with narrow particle size distribution was higher than that of the sample below 80 mesh. On the other hand, the de-
efficiency of brucite sample below 80 meshes was significantly improved by the hydrothermal treatment at 363 K tor 3 h.
A Study on Phosphate Removal Characteristic of EAF Slag for Submarine Cover Material
Kim, Jae-Won ; Seo, Jong-Beom ; Kang, Min-Gyeong ; Kim, In-Deuk ; Oh, Kwang-Joong ;
Clean Technology, volume 16, issue 4, 2010, Pages 258~264
This study estimated the possibility of phosphate removal characteristics to utilize EAF(electric arc furnace) slag as submarine cover material. The major phosphate removal mechanism was a certain formation of HAP precipitation occurred by the ionization reaction between
, which were leached from the EAF Slag. Another phosphate removal mechanism was the adsortion of EAF slag surface. As a result of
removal characteristics using continuous column reactor,
concentration decreased rapidly after 3 days and 10 days later, it show under 0.5 ppm. The result as applied in real sea water, shows that the phosphate removal effects were 93~98% by the subaqueous sediment removal using the EAF slag. In conclusion, EAF slag is useful in
removal and control and it is possible to use without additional process like crush and selection.
A Study on the Effectiveness of Remanufacturing Technology for the Diesel Oxidation Catalyst(DOC) Deactivated by Diesel Exhaust Gas
Park, Hea-Kyung ;
Clean Technology, volume 16, issue 4, 2010, Pages 265~271
The deactivated diesel oxidation catalyst(DOC) was remanufactured by ultrasonic wave treatment with various solutions, followed by active component re-impregnation. The catalytic performance and surface properties of remanufactured DOC were studied at various remanufacturing conditions. The proper ultrasonic-wave cleaning time at various solutions and optimal re-impregnation amounts of active component for the best catalytic performance were investigated. The catalytic performance tests on the conversions of CO and THC(total hydrocarbon) were also carried out at various temperatures by catalytic reaction test unit using bypass gas from the diesel engine dynamo system. It was found that the catalytic performance of DOC remanufactured with the high-temperature air washing, ultrasonic wave cleaning at acidic/basic solutions and active component re-impregnation method was recovered to 90% level of its activity compared to that of the fresh DOC, which was caused by removing the deactivating materials from the surface of the DOC through the analyses of catalyst performance test and their characterization by Optical microscope, EDX, ICP, TGA, and porosimeter.
Regeneration of Zeolite 5A in the Adsorption Process for Isoprene Purification
Jeon, Kyung-Jin ; Yoo, Kye-Sang ; Lee, Chang-Ha ; Ahn, Byoung-Sung ;
Clean Technology, volume 16, issue 4, 2010, Pages 272~276
Adsorption process for the removal of acetylene, especially 2-butyne, from isoprene was studied with zeolite as an adsorbent. In this work, zeolite 5A was selected to investigate the effects of various regeneration conditions by repeated adsorption experiments. The effect of regeneration temperature and desorption pressure was investigated to identity the optimum regeneration conditions. Repeated adsorption and desorption experiments were carried out for 10 cycles to confirm the efficiency of regeneration process under temperature of 423 K and desorption time of 16 h.
Adsorption Removal of Eosin Y by Granular Activated Carbon
Lee, Jong-Jib ;
Clean Technology, volume 16, issue 4, 2010, Pages 277~283
Eosin Y is used a colorant and dye but eosin Y is harmful toxic substance. In this study, the adsorption characteristics of granular activated carbon have been investigated for the adsorption of eosin dye dissolved in water. The effects of initial dye concentration, contact time, pH and temperature on adsorption of eosin by a fixed amount of activated carbon have been studied in batch adsorber and fixed bed. The adsorptivity of activated carbon for eosin Y were largely improved by pH control. When the pH was 3 in the sample, the eosin Y could be removed 99% of initial concentration (10 mg/L). The adsorption equilibrium data are successfully fitted to the Freundlich isotherm equation in the temperature range from 293 to 333 K. The estimated values of k and
are 19.56-134.62, 0.442-0.678, respectively. The effects of the operation conditions of the fixed bed on the breakthrough curve were investigated. When the inlet eosin Y concentration is increased from 10 to 30 mg/L, the corresponding adsorption breaktime appears to decrease from 470 to 268 min at bed height of 3 cm and a constant flow rate of 2 g/min. When the initial eosin Y flow rate is increased from 1 to 3 g/min, the corresponding adsorption breaktime appears to decrease from 272 to 140 min at bed height of 3 cm and inlet concentration of 10 mg/L. Also, breaktime increased with increasing bed height at flow rate of 2 g/min and inlet concentration of 10 mg/L. And length of adsorption zone showed similar patterns.
Effects of Ceria and CO Reductant on
Decomposition over the Layered Mixed Oxide Catalysts
Yang, Ki-Seon ; Chang, Kil-Sang ;
Clean Technology, volume 16, issue 4, 2010, Pages 284~291
Nitrous oxide (
) is a greenhouse material which is hard to remove. Even with a catalytic process it requires a reaction temperature, at least, higher than 670 K. This study has been performed to see the effects of Ce addition to the mixed oxide catalyst which shows the highest activity in decomposing
completely at temperature as low as 473 K when CO is used as a reducing agent. Mixed metal oxide(MMO) catalyst was made through co-precipitation process with small amount of Ce added to the base components of Co, Al and Rh or Pd. Consequently, the surface area of the catalyst decreased with the contents of Ce, and the catalytic activity of direct decomposition of
also decreased. However, in the presence of CO, the activity was found high enough to compensate the portion of activity decrease by Ce addition, so that it can be ascertained that the catalytic activity and stability can be maintained in the CO involved
reduction system when Ce is added for the physical stability of the catalyst.
Quantum Dot Sensitized Solar Cell Using PbS/ZnO Nanowires
Kim, Woo-Seok ; Yong, Ki-Jung ;
Clean Technology, volume 16, issue 4, 2010, Pages 292~296
We fabricated quantum dot sensitized solar cells(QDSSC) using PbS as a sensitizer and measured the solar energy conversion efficiency. After growing ZnO nanowires on the substrate by low temperature ammonia solution reaction, PbS QDs were deposited on ZnO nanowires by SILAR(Successive ionic layer adsorption and reaction) method. The morphology and crystallinity of PbS/ZnO nanowires were studied by SEM and XRD. In this study, the maximum conversion efficiency of QDSSC using PbS was 0.075% at one sun, which was lower than that of QDSSC using other sensitizers. The reasons it showed relatively low efficiency are i) the probability of type-I band gap arrangement between ZnO and PbS, ii) disturbance of electron migration by the various-sized PbS band gap, iii) stability dip by the chemical reaction of PbS QDs with electrolyte. To solve these problems, researches about controlling the size distribution of PbS and new type electrolyte would be needed.
Effect of Interconnect Structure on the Cell Performance in Anode-supported Tubular SOFC Using Three-dimensional Simulation
Hwang, Ji-Won ; Lee, Jeong-Yong ; Jo, Dong-Hyun ; Jung, Hyun-Wook ; Kim, Sung-Hyun ;
Clean Technology, volume 16, issue 4, 2010, Pages 297~303
Effect of interconnect structure on the cell performance in anode-supported tubular solid oxide fuel cell (SOFC) has been investigated in this study, employing the Fluent CFD solver. For the robust and reliable theoretical analysis corroborating experimental results, it is of great importance to elucidate the role of interconnect which is electrically connected with electrodes on the cell characteristics. From the fact that the thin interconnect provides the enhanced cell performance, it is revealed that the interconnect thickness is a key parameter that is able to effectively control the ohmic resistance. Under the constant thickness condition, the cell performance does not considerably change with the variation of interconnect width. This is because the current passage along with circumferential direction is not effectively altered by the change of interconnect width in tubular SOFC system.