http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
중량식흡착 거동에 기초한 Na형 Faujasite 제올라이트 분리막의프로필렌/프로페인 분리 거동 예측 연구
황주연,민혜현,박유인,장종산,박용기,조철희,한문희 한국막학회 2018 멤브레인 Vol.28 No.6
In this study, propylene/propane separation behavior of Na-type faujasite zeolite membranes is predicted by observing gravimetric adsorptions of propylene and propane on zeolite 13X. The gravimetric adsorptions were measured by using a magnetic suspension balance (MSB) at temperatures of 323, 343, 363 K and a pressure range of 0.02-1 bar. The pressure was increased at 0.1 bar intervals. As adsorption temperature increased, adsorptions of propylene and propane decreased and propylene/propane adsorption selectivity increased. Also, the diffusion coefficients of propylene and propane were increased as the adsorption temperature increased, following the Arrhenius equation. The maximum propylene/propane diffusion selectivity was 0.9753 at 323 K. The perm-selectivity was calculated from the adsorption data of zeolite 13X and compared with the perm-selectivity measured in the single gas permeation experiment for the Na-type faujasite zeolite membrane. The maximum values for the calculated and measured perm-selectivities were observed at a temperature of 323 K. It could be concluded that the prediction of propylene/propane separation of surface diffusion-based membrane by using gravimetric adsorption data is reasonable. Therefore, it is expected that this prediction method can be applied to the screening of adsorption-based microporous membrane for propylene/propane separation. 본 연구에서는 Na형 Faujasite 제올라이트 분리막의 프로필렌/프로페인 분리 거동을 예측하기 위하여 제올라이트 13X 입자의 프로필렌 및 프로페인 단일기체에 대한 중량식흡착 거동을 관찰하고자 하였다. 제올라이트 13X 입자의 프로필렌 및 프로페인에 대한 중량식흡착 거동은 자성부유평형저울(MSB)을 이용하여 323, 343, 363 K의 온도와 0.02-1 bar의 압력 범위에서 0.1 bar씩 증가시키면서 측정되었다. 그 결과, 온도가 증가할수록 프로필렌 및 프로페인의 흡착량은 감소하였으며, 프로필렌/프로페인의 흡착 선택도는 증가하였다. 또한 흡착 온도가 증가함에 따라 프로필렌과 프로페인의 확산계수는 증가하여 아레니우스 식을 따랐고, 프로필렌/프로페인 확산 선택도는 323 K에서 0.9753으로 최대값을 가졌다. 흡착 특성을 통해 분리막의 투과선택도를 계산하였고, Na형 Faujasite 제올라이트 분리막의 단일 기체 투과 특성과 비교하였다. 그 결과 계산된 투과선택도와 측정된 투과선택도가 모두 323 K에서 최대값을 갖는 것을 확인하였다. 따라서 본 연구에서는 중량식 흡착법으로예측된 분리막의 프로필렌/프로페인 분리거동 예측이 합리적이며 또한 표면확산에 기반한 프로필렌/프로페인 분리용 제올라이트 분리막의 분리성능예측에 적용될 수 있음을 알 수 있었다.
금속 사출성형 방식의 다공성 스테인리스 강 지지체에 형성된 팔라듐 수소 분리막의 투과 선택도 특성
김세홍(Se-Hong Kim),양지혜(Ji-Hye Yang),임다솔(Da-Sol Lim),김동원(Dong-Won Kim) 한국표면공학회 2017 한국표면공학회지 Vol.50 No.2
Pd-based membranes have been widely used in hydrogen purification and separation due to their high hydrogen diffusivity and infinite selectivity. However, it has been difficult to fabricate thin and dense Pd-based membranes on a porous stainless steel(PSS) support. In case of a conventional PSS support having the large size of surface pores, it was required to use complex surface treatment and thick Pd coating more than 6 μm on the PSS was required in order to form pore free surface. In this study, we could fabricate thin and dense Pd membrane with only 3 μm Pd layer on a new PSS support manufactured by metal injection molding(MIM). The PSS support had low surface roughness and mean pore size of 5 μm. Pd membrane were prepared by advanced Pd sputter deposition on the modified PSS support using fine polishing and YSZ vacuum filling surface treatment. At temperature 400oC and transmembrane pressure difference of 1 bar, hydrogen flux and selectivity of H₂/N₂ were 11.22 ml cm<SUP>-2</SUP> min<SUP>-1</SUP> and infinity, respectively. Comparing with 6 μm Pd membrane, 3 μm Pd membrane showed 2.5 times higher hydrogen flux which could be due to the decreased Pd layer thickness from 6 μm to 3 μm and an increased porosity. It was also found that pressure exponent was changed from 0.5 on 6 μm Pd membrane to 0.8 on 3 μm Pd membrane.
Preparation and Permeation of La2Ce2O7 Membrane
박지혜,정미원 한국세라믹학회 2015 한국세라믹학회지 Vol.52 No.4
La2Ce2O7 and CeO2 membranes were fabricated from the corresponding powders derived from sol-gel process with polyvinyl alcohol binder. These powders and membranes were characterized by XRD, BET, and FE-SEM analysis. Hydrogen and CO gas permeation experiments were performed using Sievert’s type equipment. Both fluxes on these membranes were found to decrease with increase of the temperature. This phenomenon was followed by the surface and Knudsen diffusion mechanism. The hydrogen permeability of the La2Ce2O7 membrane was found to be 7.27 × 10−5 mol/m2sPa, with perm-selectivity of 7.24 at 303 K.
다공성 스테인리스 강 지지체의 표면개질에 따른 팔라듐-은 합금 수소 분리막의 수소 투과 선택도의 변화
김낙천(Nak-Cheon Kim),김세홍(Se-Hong Kim),이진범(Jin-Beum Lee),김현희(Hyun-Hee Kim),양지혜(Ji-Hye Yang),김동원(Dong-Won Kim) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
Pd-Ag alloy membranes have attracted a great deal of attention for their use in hydrogen purification and separation due to their high theoretical permeability, infinite selectivity and chemical compatibility with hydrocarbon containing gas streams. For commercial application, Pd-based membranes for hydrogen purification and separation need not only a high perm-selectivity but also a stable long-term durability. However, it has been difficult to fabricate thin, dense Pd-Ag alloy membranes on a porous stainless steel metal support with surface pores free and a stable diffusion barrier for preventing metallic diffusion from the porous stainless steel support. In this study, thin Pd-Ag alloy membranes were prepared by advanced Pd/Ag/Pd/Ag/Pd multilayer sputter deposition on the modified porous stainless steel support using rough polishing/ZrO₂ powder filling and micro-polishing surface treatment, and following Ag up-filling heat treatment. Because the modified Pd-Ag alloy membranes using rough polishing/ZrO₂ powder filling method demonstrate high hydrogen permeability as well as diffusion barrier efficiency, it leads to the performance improvement in hydrogen perm-selectivity. Our membranes, therefore, are expected to be applicable to industrial fields for hydrogen purification and separation owing to enhanced functionality, durability and metal support/Pd alloy film integration.
Preparation and Permeation of La<sub>2</sub>Ce<sub>2</sub>O<sub>7</sub> Membrane
Park, Jihye,Jung, Miewon The Korean Ceramic Society 2015 한국세라믹학회지 Vol.52 No.4
$La_2Ce_2O_7$ and $CeO_2$ membranes were fabricated from the corresponding powders derived from sol-gel process with polyvinyl alcohol binder. These powders and membranes were characterized by XRD, BET, and FE-SEM analysis. Hydrogen and CO gas permeation experiments were performed using Sievert's type equipment. Both fluxes on these membranes were found to decrease with increase of the temperature. This phenomenon was followed by the surface and Knudsen diffusion mechanism. The hydrogen permeability of the $La_2Ce_2O_7$ membrane was found to be $7.27{\times}10^{-5}mol/m^2sPa$, with perm-selectivity of 7.24 at 303 K.
Nanoelectrokinetic Selective Preconcentration Based on Ion Concentration Polarization
최지혜,백성호,김희찬,채종희,고영일,서상우,이효민,김성재 한국바이오칩학회 2020 BioChip Journal Vol.14 No.1
Nanoscale electrokinetic phenomenon called ion concentration polarization (ICP) has opened a new era in bio- and chemical-analysis platform due to its high efficiency and easy sample handling. In this review, the most recent advancements of selective preconcentration process using ICP were introduced. The flux balances of charged analytes were theoretically analyzed so that the behavior and the shape of preconcentrated plug were categorized into stacking/propagating and dumbbell/plug, respectively. The experimental demonstrations of these features were also given to verify the modeling. Furthermore, promising applications based on the analysis were described in this review. Lastly, future research direction would be suggested by elucidating pros and cons of ICP process.
스퍼터 공정변수가 팔라듐 합금 수소분리막의 특성에 미치는 영향
한재윤(Jae-Yun Han),주새롬(Sae-Rom Joo),이준형(Jun-Hyong Lee),박동건(Dong-Gun Park),김동원(Dong-Won Kim) 한국표면공학회 2013 한국표면공학회지 Vol.46 No.6
It is generally recognized that thin Pd-Cu alloy films fabricated by sputtering show a wide range of microstructures and properties, both of which are highly dependent on the sputtering conditions. In view of this, the present study aims to investigate the relationship between the performance of hydrogen separation membranes and the microstructure of Pd alloy films depending on sputtering deposition conditions such as substrate temperature, working pressure, and DC power. We fabricated thin and dense Pd-Cu alloy membranes by the micro-polishing of porous Ni support, an advanced Pd-Cu sputtered multi-deposition under the conditions of high substrate temperature / low working pressure / high DC power, and a followed by Cu-reflow heattreatment. The result of a hydrogen permeation test indicated that the selectivity for H₂/N₂ was infinite because of the void-free and dense surface of the Pd alloy membranes, and the hydrogen permeability was 10.5 ml·cm-2<SUP></SUP>·min<SUP>-1</SUP>·atm<SUP>-1</SUP> for a 6 μm membrane thickness.
표면 니켈 조성에 따른 팔라듐-니켈-은 합금 수소분리막의 수소투과선택 특성
임다솔(Da-Sol Lim),김세홍(Se-Hong Kim),김도희(Do-Hui Kim),조서현(Seo-Hyun Cho),김동원(Dong-Won Kim) 한국표면공학회 2018 한국표면공학회지 Vol.51 No.5
In this study, Pd-Ni-Ag alloy hydrogen separation membranes were fabricated by Pd/Ag/Pd/Ni/Pd multilayer sputter deposition on the modified MIM(Metal Injection Molding)-PSS(Porous Stainless Steel) support and followed heat treatment. Nickel, used as an alloying element in Pd alloy membranes, is inexpensive and stable material in a hydrogen isotope environment at high temperature up to 1123 K. Hydrogen permselectivity of Pd-Ni-Ag alloy membranes is affected not only by composition of membrane films but also by other factors such as surface properties of PSS support, microstructure of membrane films and inter-diffused impurities from PSS support. In order to clarify the effect of surface Ni composition on hydrogen permselectivity of Pd-Ni-Ag alloy membranes, the other effects were significantly minimized by the formation of dense and homogeneous Pd-Ni-Ag alloy membranes. Hydrogen permeation test showed that hydrogen permeability decreased from 7.6 × 10<SUP>-09</SUP> to 1.02 × 10<SUP>-09</SUP> mol/m·s·Pa<SUP>0.5</SUP> as Ni composition increased from 0 to 16 wt% and the selectivity for H₂/N₂ was infinite.