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- 저자 : 김태곤 (검색결과 1,171 건)
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Structural pore elucidation of super-activated carbon based on the micro-domain structure model
김태곤,김두원,Keiko Ideta,박초이,Jin Miyawaki,박주일,윤성호 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
For elucidation of the pore structure of super-activated carbon (SAC) based on the micro-domain structuremodel, a new experiment of inverse approach was designed by ball-mill treatment. The two representativeSACs with an ultra-high specific surface area ( 3000 m2 g 1) used Maxsorb-III as a nongraphitizablecarbon and M-30 as a graphitizable carbon, which are derived from petroleum coke andmeso-phase carbon microbeads (MCMB), respectively. SACs consisting of micro-domains, are destroyedduring ball milling due to the weak-interactions between the micro-domains. The formation mechanismsof their intra-particular pores (internal slit-like micropores in micro-domain) and inter-particular pores(channeled mesopores between microdomains) are successfully explained by the N2 adsorption/desorptionisotherms, FE-SEM, HR-TEM, STEM, and electrochemical techniques. In addition, their capacitancebehaviors using different electrolytes as a probe are clearly matched with the change of micro- and mesoporesthrough the ball-mill treatment. This novel micro-domain structure model for porous carbon materialssuccessfully accounts for critical limitations of the conventional hierarchical pore structure model.
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Analysis and deep hydrodesulfurization reactivity of Saudi Arabian gas oils
김태곤,박주일,Syed Ahmed Ali,Khalid Alhooshani,Mohammed Al-Yami,윤성호,Isao Mochida 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Gas oils obtained from Arabian Light (AL-GO), Arabian Medium (AM-GO) and Arabian Heavy (AH-GO)crude oils were subjected to detailed analysis in terms of reactive and refractory sulfur, nitrogen, as well as aromatic species. Deep hydrodesulfurization (HDS) of these gas oils over SiO2–Al2O3-supported CoMo and NiMo catalysts was studied using autoclave reactor either in one- or two-stage operations. AL-GO was easily and deeply desulfurized to 15 ppm over CoMo/Al2O3–SiO2 (catalyst X) at 340 8C and 5 MPa (H2) for 2 h. At the same conditions, AM-GO and AH-GO could be desulfurized to 70 and 78 ppm,respectively. Two-staged HDS, by combining CoMo and NiMo catalysts, in successive steps resulted in effective deep HDS. The replacement of hydrogen atmosphere after the first-stage (1 h) enhanced the AH-GO HDS during the second-stage (1 h) to 9 ppm. However, replacing the hydrogen in the secondstage with 5% H2S in hydrogen inhibited the HDS, resulting in product sulfur content of 15 ppm. Analysis of sulfur species indicate that significant fraction of reactive and refractory sulfur species were removed during the first-stage whereas the remaining refractory sulfur species were removed during the second-stage. Kinetic analysis indicates overwhelming influence of refractive sulfur species on the overall HDS. The results from this study show that two-stage scheme with optimum catalysts in series can be applied to overcome the difficulty to achieve deep HDS of AH-GO.
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점유율 특성을 이용한 도시고속도로의 서비스수준(LOS) 평가에 관한 연구
김태곤,문병근,조인국,정유나,Kim, Tae gon,Moon, Byoung Keun,Jo, In Kook,Jung, Yu Na 대한토목학회 2009 대한토목학회논문집 D Vol.29 No.3D
일반적으로 도로시설의 기본구간에 대한 서비스수준(LOS)의 효과척도로 밀도가 사용되지만, 도로시설의 현장에서 관측된 관측밀도와 교통특성자료로부터 산정된 산정밀도사이에는 오차가 발생할 수 있기 때문에 도로시설의 서비스수준을 제대로 나타낼 수가 없다. 따라서 본 연구의 목적은 연구대상 도시고속도로의 본선구간 상에 관측기기를 설치하여 실시간의 교통특성 자료(교통량, 속도, 점유율, 차두시간, 차두거리 등)를 수집 조사하고, 수집 조사된 교통특성자료의 상호관계로부터 연구대상 기본구간 상의 최대 교통류율을 비교 분석하며, 비교 분석된 최대 교통류율을 중심으로 각 서비스수준별 점유율과 v/c비율사이의 관계에 기초하여 도시고속도로의 기본구간에서 서비스수준의 평가기준을 산정 평가하고자 하는데 있다. Generally, density is used as a measure of effectiveness (MOE) of the level of service (LOS) for the basic segment of the roadway facility, but can not express the operational condition of the roadway facility properly because there can be an error in the computed density compared with the density measured in the field. Thus, the purpose of this study is to investigate the real-time traffic characteristic data (traffic flow, speed, occupancy, headway, spacing, etc.) from the detectors installed on the mainline section of urban freeway under the study, analyze the maximum flow rate from the relationship between the real-time traffic characteristics collected, and evaluate the LOS criteria within the basic segment of the urban freeway based on the relationship between the occupancy and the v/c ratio depending on the level of service.
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