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Microstructural control of a SSZ-13 zeolite film via rapid thermal processing
Kim, Jinseong,Jang, Eunhee,Hong, Sungwon,Kim, Dongjae,Kim, Eunjoo,Ricther, Hannes,Simon, Adrian,Choi, Nakwon,Korelskiy, Danil,Fouladvand, Shahpar,Nam, Jaewook,Choi, Jungkyu Elsevier 2019 Journal of membrane science Vol.591 No.-
<P><B>Abstract</B></P> <P>A SSZ-13 zeolite (CHA type zeolite having a pore size of 0.37 × 0.42 nm<SUP>2</SUP>) can separate CO<SUB>2</SUB> (0.33 nm) from larger molecules (N<SUB>2</SUB> (0.364 nm) or CH<SUB>4</SUB> (0.38 nm)) because of the molecular size differences. However, methods to control the non-zeolitic defects of SSZ-13 membranes are lacking. Here, we demonstrate that rapid thermal processing (RTP) of as-synthesized SSZ-13 films tunes their microstructural defect properties and increases their CO<SUB>2</SUB> separation ability. The maximum CO<SUB>2</SUB>/N<SUB>2</SUB> separation factor (SF) at 30 °C increased from ~2.9 to ~4.8 due to RTP because the defective region was reduced. Furthermore, the addition of water vapor (the third main component of coal-fired power plant flue gas) to the feed markedly improved the CO<SUB>2</SUB>/N<SUB>2</SUB> SF of the RTP-treated SSZ-13 membrane; from ~4.3 at 50 °C (a representative flue gas stream temperature) under dry conditions to ~10.1 under wet conditions (vs. ~1.6 across the conventionally calcined counterpart). Furthermore, the less-defective RTP-treated SSZ-13 membranes achieved a CO<SUB>2</SUB>/CH<SUB>4</SUB> SF as high as ~43.7 under wet conditions at 50 °C. Fluorescence confocal optical microscopy analyses complemented with the permeation modeling revealed that the reduced defect size after RTP (~2.2 nm against ~3.9 nm for the conventionally calcined counterpart) improved the CO<SUB>2</SUB> permselectivity, even though the defect porosities were low (~0.1%).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Rapid thermal processing (RTP) of SSZ-13 films improved the CO<SUB>2</SUB> permselectivities. </LI> <LI> The improved separation performance was attributed to the reduced defect size. </LI> <LI> Despite the comparable degree of defects, their size determined the performance. </LI> <LI> Such improvement was pronounced with respect to water vapor-containing feeds. </LI> <LI> Robust CO<SUB>2</SUB> permselectivities were achieved using the RTP-treated SSZ-13 membranes. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kim, Heejoong,Jang, Eunhee,Jeong, Yanghwan,Kim, Jinseong,Kang, Chun Yong,Kim, Chang Hwan,Baik, Hionsuck,Lee, Kwan-Young,Choi, Jungkyu Elsevier 2018 CATALYSIS TODAY - Vol.314 No.-
<P><B>Abstract</B></P> <P>A hierarchically structured zeolite (self-pillared pentasil; SPP) comprised of MFI nanosheets or lamellae has been synthesized in various Si/Al ratios and mesoporosities. It turns out that a simple removal of ethanol in a synthesis sol resulted in increased mesoporosity, while the additional reduction of water further increased mesoporosity. In addition, we could synthesize the SPP particle with the actual Si/Al ratio as low as ∼23 with a modest mesoporosity. With these hierarchically structured SPP particles, we further conducted copper impregnation on them in order to use as a hydrocarbon (HC) trap. The resulting Cu-impregnated SPPs could not only adsorb HCs in the exit gas stream including water vapor, but also serve as an active oxidizer of HCs. Specifically, Cu-impregnated SPP with an actual Si/Al ratio of ∼22 and medium mesoporosity exhibited very high performance in cold-start trap tests; desirably adsorbing propene and toluene even in the presence of 10 vol% steam, holding them up to higher temperatures (90 °C for propene and 190 °C for toluene), and furthermore, oxidizing the hydrocarbons. The preferred adsorption can be attributed to the larger amount of exchanged Cu<SUP>2+</SUP> ions in SPP particles with a lower Si/Al ratio, while the additional oxidation was due to the CuO particles dispersed on the SPP surface. However, the hydrothermal stability test revealed that the zeolite structure in the Cu-impregnated SPPs was collapsed and transformed into another undesired phase, thus losing the above-mentioned adsorption ability. Nevertheless, the corresponding oxidation performance was well maintained, indicating the robust, active role of the CuO particles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The mesoporosity in SPP particles was increased by removing ethanol and water. </LI> <LI> Mesoporous SPP particles with a Si/Al ratio as low as ∼23 could be synthesized. </LI> <LI> Cu-impregnated SPPs were effective for eliminating hydrocarbon (HC) in a cold start. </LI> <LI> The effect of physicochemical properties of SPPs on the HC trap was investigated. </LI> <LI> Cu<SUP>2+</SUP> ions increased HC adsorption, while CuO contributed to HC oxidation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
COMPONENT SIZING OF PARALLEL HYBRID ELECTRIC VEHICLE USING OPTIMAL SEARCH ALGORITHM
Jinseong Kim,김기수,박영일 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.4
In designing a parallel hybrid electric vehicle, it is essential to select the optimal capacity of power sources and the optimal gear ratio of the torque coupler. The capacity of the power sources and the gear ratio of the torque coupler should be optimized simultaneously. However, since this process is excessively time-consuming, previous studies have selected the gear ratio of the torque coupler and then selected the capacity of power source. However, this approach cannot guarantee global optimization. In this paper, a feasible region is defined to satisfy the required performance of vehicle such as maximum speed, hill-climbing. and feasible points are selected inside the feasible region. In the conventional technique, the global optimal solution is obtained by simulating all feasible points. In the optimization technique, optimal points are simulated within the feasible region using several optimal search algorithms, such as the golden section search algorithm and the hillclimbing search algorithm. And using these algorithms, the number of simulations is reduced and the capacity of the power source and the gear ratio of the torque coupler are optimized simultaneously. Finally, the validity of the component sizing results is verified by comparing the global optimal solution obtained by applying the conventional technique with the solution obtained by applying the proposed optimization technique.
Vibration Reduction Control of Omnidirectional Mobile Robot with Lift Mechanism
Jinseong Park,Doo-Yeol Koh,Jeong-Jung Kim,Chang-Hyun Kim 제어로봇시스템학회 2021 제어로봇시스템학회 국제학술대회 논문집 Vol.2021 No.10
An omnidirectional mobile robot with lift mechanism has been developed to assist worker to transport heavy goods placed on high position. However, as the center of gravity heightens and the stiffness decreases with introducing the lift mechanism, and the suspension is adopted for consistent contact between mecanum wheel and the ground, a large amount of vertical vibration is inevitable. In this paper, the simultaneous controller for the driving velocity tracking and vibration reduction without additional actuators is developed based on a combined model with longitudinal and vertical motion, i.e. a suspended cart-pole inverted pendulum model. Proper Filters were designed to effectively remove uninterested characteristics such as mecanum wheel roller contact vibration and static inclination so that the performance of the vibration reduction controller can be optimized. From the experimental results, the performance of the proposed method is verified that the magnitude and time of residual vibration greatly reduced.
김진성(Jinseong Kim),이기만(Keeman Lee) 한국연소학회 2023 KOSCOSYMPOSIUM논문집 Vol.2023 No.5
In this study, the effect of hydrogen mixing rate on combustion instability in annular combustors was investigated. When hydrogen was mixed in the annular combustor, the longitudinal instability with the equivalent ratio was confirmed. To this end, pressure and heat release data were obtained, and through FFT analysis, the condition where combustion instability occurs was identified. The present research shows that combustion instability increased as the equivalent ratio increased at lean premixed condition.
경사 레일이탈강도 시험법을 통한 시트벨트앵커 시험 예측
김진성(Jinseong Kim),최석민(Seokmin Choi),손현일(Hyunil Son),손동욱(Donguk Son),임현우(Hyunwoo Lim),오영근(Younggeun Oh) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Seat Belt System is one of the factors that affect a large degree of injury to the passenger during a crash or collision occurrence. According to domestic traffic accident statistics that occurred in 2014, mortality of passengers that not wear a seat belt is approximately 0.39%. On the other hand, the incidence of fatal accidents decreased significantly when a seat belt wearing. Seat Belt Anchorage System that for minimizing the restriction upon the movement of passenger has tested according each nation’s regulation including North America, Europe, and China, etc. In this paper, we analysis the relation between slide-rail Strength and Seat Belt Anchorage Strength. And then we establish a test method to predict a seat belt anchorage system.