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RISS 인기검색어
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- 저자 : Jeong Kwon Suh(서정권) (검색결과 51 건)
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크롬 및 구리가 담지된 La2O3 / Al2O3 계 복합산화물 촉매의 구조 및 열안정성
서정권,하백현 ( Jeong Kwon Suh,Baik Hyon Ha ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.6
The structure and thermal properties of Cr and Cu added La₂O₃/Al₂O₃ system were investigated using XRD, BET, ESCA, TEM and DTA. During calcination the addition of chromium retarded the phase transition of La-β-Al₂O₃ and improved the thermal stability of La₂O₃/Al₂O₃ system at highly temperature. However the addition of copper on La₂O₃/Al₂O₃ system accelerated the phase transition of support. The surface area after being calcined at 1,200℃ for 2 hours was 40 ㎡/g for (Cr₂O₃) (La₂O₃) (Al₂O₃)_(19) oxide and 10 ㎡/g for (CuO)(La₂O₃)(Al₂O₃)_(19) oxide. The sintering of La₂O₃/Al₂O₃ system at 1,000℃ proceeded via surface diffusion and was not influenced by the Cr addition. The sintering of Cu added La₂O₃/Al₂O₃ system proceeded via viscous flow. The activation energy of the phase transition above 1,200℃ had a constant value about 600 kJ/㏖, regardless of the Cr and Cu addition.
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전이 금속 산화물이 담지된 La / Al 복합산화물 촉매상에서의 메탄 연소반응
서정권,하백현,고재천,이정민 ( Jeong Kwon Suh,Baik Hyon Ha,Jae Cheon Koh,Jung Min Lee ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.6
Combustion catalysts were prepared by the impregnation of transition metal oxide on La/Al oxide(Al₂O₃/La₂O₃=19), and then calcined in air. Methane combustion was carried out using these catalysts. X-ray diffraction analysis indicates that La/Al oxide was crystallized from amorphous form into La-β-Al₂O₃ phase above 1200℃. Crystallization was accelerated by the addition of copper on La/Al oxide, but it was retarded by the addition of chromium on La/Al oxide. The copper content of the surface of CuO-La/Al oxide decreased as the calcination temperature increased. This result indicates the formation of solid solution. In case of Cr₂O₃-La/Al oxide, Cr₂O₃mainly existed on the catalyst surface. The activities of catalysts calcined at 1200℃ appeared as the following order; CuO, Cr₂O₃>Fe₂O₃>MnO>CoO>NiO. The catalytic activity of CuO-La/Al oxide decreased as the calcination temperature increased. However the catalytic activity of Cr₂O₃-La/Al oxide was still maintained after calcination at 1400℃.
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서정권 ( Jeong Kwon Suh ),홍지숙 ( Ji Sook Hong ),이창하 ( Chang Ha Lee ),이정민 ( Jung Min Lee ) 한국공업화학회 2003 공업화학 Vol.14 No.2
Zeolite X/activated carbon composite (zeocarbon) was synthesized from rice hulls. The adsorption equilibrium of H_2O on zeocarbon was compared with that of zeolite 13X, Langmuir-Freundlich, Excess Surface Work (ESW) and Multi-BET isotherm models were used to fit the experimental data of H_2O adsorption on zeocarbon and zeolite 13X. In the case of zeocarbon, the minimum error of 1.39% resulted when the Langmuir-Freundlich model was applied at 313.15 K. In the cases of Multi-BET and ESW models, the minimum errors were 2.29% and 0.47% at 131.15 K and 353.15 K, respectively. In the case of zeolite 13X, the minimum error was 0.10% at 0.68%, at 313.15 K and 353.15 K, respectively. ESW model was found to be in better agreement with the experimental values than Langmuir-Freundlich model or Multi-BET model. Considering that monolayer adsorption occurs in low-pressure region, while the capillary condensation phenomenon prevails in high-pressure region, ESW model fitted well under all the temperature and pressure conditions.
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성형 Co-Ru-Zr-Si 촉매를 이용한 이산화탄소에 의한 메탄 리포밍
남정광 ( Jeong Kwang Nam ),이지혜 ( Ji Hye Lee ),송상훈 ( Sang Hoon Song ),안홍찬 ( Hong Chan Ahn ),장태선 ( Tae Sun Chang ),서정권 ( Jeong Kwon Suh ),김성보 ( Seong Bo Kim ) 한국공업화학회 2012 공업화학 Vol.23 No.2
The methane dry reforming has received the considerable attention in recent years, mainly as an attractive route to produce synthesis gas (CO, H2) from green-house gases (CH4, CO2) for resources. However, this process has not been commercialized due to the high temperature and catalyst deactivation. In this study, Co-Ru-Zr catalysts supported on SiO2 were studied for the characterization of methane dry reforming reaction and the preliminary data for process development were achieved. The crystal structure of catalysts was measured by XRD, the surface area and pore size were analyzed by BET, and the element composition of catalyst were analyzed by EDS. Conversions of methane and carbon dioxide were analyzed by GC. In addition, reaction rate constants were obtained from the reaction kinetic study and the optimum catalyst size that does not affect mass transfer from reactants was also determined. The selected pellet-type catalyst maintained activation for 720 h at 850 ℃.
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정순용,서정권,박중환,도명기,고재천,이정민,Jeong, Soon-Yong,Suh, Jeong-Kwon,Park, Jeong-Hwan,Doh, Myung-Ki,Koh, Jae-Cheon,Lee, Jung-Min 한국공업화학회 1994 공업화학 Vol.5 No.3
The ion-exchange properties of $Ca^{2+}$ and $Mg^{2+}$ ions have been studied in ${\delta}-Na_2Si_2O_5$ synthesized from water glass. Results show that optimum temperature for synthesis of ${\delta}-Na_2Si_2O_5$ was $725^{\circ}C$. Ion-exchange isotherms for $Ca^{2+}$ and $Mg^{2+}$ exchange for $Na^+$ in the synthetic ${\delta}-Na_2Si_2O_5$ show that the ion-exchange capacity of magnesium is better than that of calcium, and the ion-exchange of magnesium is less sensitive for temperature than that of calcium. When initial pH of solution is increased between 2 and 6, the ion-exchange capacities of magnesium and calcium decrease a little. However, they are almost constant above pH 6 because of alkali buffer effect of ${\delta}-Na_2Si_2O_5$. In the thermodynamic studies, it was found that Gibbs free energies of reaction of calcium ion-exchange are larger than those of magnesium ion-exchange with inverse order of selectivity. The standard enthalpy and entropy of reaction of calcium ion-exchange are larger than those of magnesium ion-exchange.
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연속적인 결정화 방법에 의한 금속 지지체상에서 Zeolite - X 의 결정성장
박중환,서정권,정순용,이정민,도명기 ( Jeong Hwan Park,Jeong Kwon Suh,Soon Yong Jeong,Jung Min Lee,Myung Ki Doh ) 한국공업화학회 1997 공업화학 Vol.8 No.6
The films of zeolite X on the surface of metal sieve were prepared by continuous crystallization method. It is known that the growth of zeolite crystal on the surface of metal is mainly dependent on the surface composition of metal sieve. In the present work, the zeolite nuclei could be easily formed as Cr content on the metal surface was removed by acid treatment. In order to investigate the procedure growing of zeolite crystal by the continuous crystallization method, the composition of zeolite X(6.36Na₂O-Al₂O₃-5.3SiO₂-190.8H₂O) was supplied every 12hour. Then the mechanism and inter-relationship between the metal surface and nucleation are investigated. The results show that as the content of silica increases in the gel mixture, the nuclei of zeoilite are easily formed on the metal surface. Also, it was confirmed that the particle of zeolite stuck on the metal surface continues the linear growth. The particles are combined by the reaction of polycondensation, and finally become the shape of crystal. The sample synthesized by the film type was confirmed as zeolite X by the analyses of SEM and XRD.
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Water Glass 로부터 합성한 δ- Na2Si2O5 의 Ca2+ , Mg2+ 이온교환성
정순용,서정권,박중환,도명기,고재천,이정민 ( Soon Yong Jeong,Jong Kwon Suh,Jeong Hwan Park,Myung Ki Doh,Jae Cheon Koh,Jung Min Lee ) 한국공업화학회 1994 공업화학 Vol.5 No.3
The ion-exchange properties of Ca^(2+)and Mg^(2+) ions have been studied in δ-Na₂Si₂O_5 synthesized from water glass. Results show that optimum temperature for synthesis of δ-Na₂Si₂O_5 was 725℃ . Ion-exchange isotherms for Ca^(2+) and Mg^(2+) exchange for Na^+ in the synthetic δ-Na₂Si₂O_5 show that the ion-exchange capacity of magnesium is better than that of calcium, and the ion-exchange of magnesium is less sensitive for temperature than that of calcium. When initial pH of solution is increased between 2 and 6, the ion-exchange capacities of magnesium and calcium decrease a little. However, they are almost constant above pH 6 because of alkali buffer effect of δ-Na₂Si₂O_5. In the thermodynamic studies, it was found that Gibbs free energies of reaction of calcium ion-exchange are larger than those of magnesium ion-exchange with inverse order of selectivity. The standard enthalpy and entropy of reaction of calcium ion-exchange are larger than those of magnesium ion-exchange.
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