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안병성,김홍곤,권영수 ( Byoung Sung Ahn,Hong Gon Kim,Young Soo Kwon ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
A method for determining heat transfer coefficients and the effective thermal conductivity in a nonisothermal and nonadiabatic fixed-bed reactor has been proposed. By using the temperatures experimentally measured at several points in the fixed-bed and the outside wall of the reactor, the overall heat transfer coefficient(h_t), the inside wall heat transfer coefficient(h_w), and the effective thermal conductivity(k_(er)) were calculated on the assumption that the system is pseudo-homogeneous. The system has been analyzed one-dimensionally for h_t and two-dimensionally for h_w & k_(er), respectively. The coefficients obtained in the temperature range of 200-300℃ for the reactor of 4 diameter were found to be different for heating or cooling. Nevertheless, the temperature distributions in the reactor simulated with the obtained coefficients were in a good accordance with the experimental observations. The effect of fluid convection in the fixed-bed according to heating or cooling on k_(er) was also discussed. The method proposed in this study can be very effectively used in determining the coefficients and predicting the temperature distribution in an industrial fixed-bed reactor without any additional system or instrument.
Fluorinated Pd/Al2O3 촉매를 이용한 CFC-12 의 탈염소수소화 반응
전상구(Sang Gu Jeon),설용건(Yong Gun Shul),이현주(Hyun Joo Lee),안병성(Byoung Sung Ahn) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.1
The hydrodechlorination of CFC-12(CFZCIz) has been studied with Pd/Al₂O₃ catalysts. The catalysts were fluorinated by HCFC-22(CHF₂Cl) or reduced by hydrogen before the reaction. And they were characterized by BET, XRD, and TEM before and after the reaction. The activities and selectivities to HFC-32(CH₂F₂) were compared in the fluorinated and the reduced catalysts. The fluorinated catalyst has shown better performance in activity and selectivity rather than the conventional reduced one, as well as in prevention of Pd sintering which causes deactivation of the catalyst. It is presumed that formation of Pd-F bond in the fluorination prevents sintering of Pd while the formation of AlF₃ from Al₂O₃. Also, Pd carbide was observed in the fluorinated catalyst and this carbide is thought to enhance the partial dehalogenation(dechlorination) in CFC-12.
제올라이트 A를 이용하여 이소프렌에서 아세틸렌 제거를 위한 선택적 흡착공정 개발
전경진 ( Kyung Jin Jun ),안병성 ( Byoung Sung Ahn ),유계상 ( Kye Sang Yoo ) 한국공업화학회 2010 공업화학 Vol.21 No.5
본 연구는 이소프렌에서 아세틸렌 불순물을 선택적으로 제거하기 위한 효과적인 흡착제의 개발이다. 흡착제로 기공의 크기가 4 Å에서 5 Å인 제올라이트를 이용하여 아세틸렌을 흡착하여 제거하는데 기공의 크기가 미치는 영향을 살펴보았다. 제올라이트 A의 기공크기는 Na와 Ca의 조성을 변화하여 조절하였다. 특히 아세틸렌의 주성분인 2-methyl-1-butyne-3-yen (IPA)와 2-butyne의 동역학적 지름의 차이 때문에 흡착제의 기공 크기는 흡착효과에 지대한 영향을 미치게 된다. 기공의 크기가 5 Å인 흡착제는 2-butyne의 높은 흡착력을 보였으나 IPA에는 낮은 흡착력을 보였다. 흡착등온선의 경우 개선된 Langmuir 모델이 2-butyne 흡착에 대해서 가장 좋은 fitting을 보였다. 이외에도 최적의 재생 조건을 찾기 위한 실험을 수행하였고 300℃에서 12 h 동안 재생하였을 때 매우 효과적이었다. This study focused on the development of effective adsorbent to remove acetylenes for the purification of isoprene. The adsorbents with various pore sizes from 4 Å to 5 Å were prepared to investigate the effect of pore size on selective adsorption of acetylene as an impurity. The pore size of zeolite A was adjusted by ion-exchange between Na and Ca ions. The pore size of adsorbents has affected the removal of acetylenes selectively because of the kinetic diameter of acetylenes, such as 2-methyl-1-butyne-3-yen (IPA) and 2-butyne. In a batch adsorption experiment, 5A zeolite with pore size of 5 Å showed the highest removal capacity of 2-butyne. However, IPA was hardly removed from isoprene by the A-type zeolites. For the adsorption isotherm, modified Langmuir model was well fitted with 2-butyne adsorption. Moreover, the regeneration of adsorbent was carried out to determine optimum method. The adsorbent heated for 12 h at 300 ℃ was regenerated significantly.
단신 : 팔라듐 입자 제조에 미치는 이미다졸계 이온성액체의 양이온 효과
김창수 ( Chang Soo Kim ),안병성 ( Byoung Sung Ahn ),태현만 ( Hyun Man Tae ),전승혜 ( Seung Hye Jeon ),유계상 ( Kye Sang Yoo ) 한국공업화학회 2012 공업화학 Vol.23 No.5
전통적인 화학적 환원법에 이온성액체를 사용하여 팔라듐 입자를 제조하였다. 이온성액체를 구성하는 양이온의 종류에 따라 형성된 팔라듐 입자는 다양한 크기와 모양을 가지는 것이 관찰되었다. 이는 이온성액체의 양이온이 길이에 따라 합성 중에 이온성액체들 간에 형성되는 구조체의 안정성에 차이를 보이기 때문이다. [BF4] 음이온을 가지는 이온성액체 중 양이온의 알킬기가 hexyl인 이온성액체를 이용하여 합성된 팔라듐 입자가 가장 작고 균일하게 형성되었다. Palladium particles were synthesized by conventional chemical reduction method with ionic liquids. The size and shape of palladium particles were significantly affected by the cation parts of ionic liquids. This is mainly attributed to the different stabilities of the ionic liquid structure formed by the physical bond between the cation parts. Among ionic liquids with [BF4] as an anion part, the hexyl substituent in the cation parts was more effective to synthesize palladium particles with the smaller size and more uniform shape.
Ni계 촉매상에서 메탄에 의한 이산화탄소의 개질반응에 의한 수소제조 및 응용
문동주,강정식,류종우,김대현,유계상,이현주,김홍곤,이상득,안병성,이병권,Moon, Dong-Ju,Kang, Jung-Shik,Ryu, Jong-Woo,Kim, Dae-Hyun,Yoo, Kye-Sang,Lee, Hyun-Joo,Kim, Hong-Gon,Lee, Sang-Deuk,Ahn, Byoung-Sung,Lee, Byung-Gwon 한국수소및신에너지학회 2006 한국수소 및 신에너지학회논문집 Vol.17 No.2
Catalytic reforming of $CO_2$ by $CH_4$ over Ni-YSZ based catalysts was investigated to produce syngas as raw material of high valued chemicals and develop high performance catalyst electrode for an internal reforming of $CO_2$ in SOFC system. Ni-YSZ based catalysts were prepared using physical mixing and maleic acid methods to improve catalytic activity and inhibition of carbon deposition. The catalysts before and after the reaction were characterized by $N_2$ physisorption, TPR(temperature programed reduction), XRD and impedance analyzer. The conversions for $CO_2$ and $CH_4$ over Ni-MgO catalyst showed 90% but much amount of carbon deposition was detected on catalyst surface. On the other hand, the conversions for $CO_2$ and $CH_4$ over NiO-YSZ-$CeO_2$ catalyst showed 100% and 85% respectively, and carbon deposition on catalyst surface was inhibited under the tested condition. It was concluded that NiO-YSZ-$CeO_2$ catalyst is a promising candidate for the catalytic reforming of $CO_2$ and the internal reforming in SOFC system.