• 폴리머
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• 제37권3호
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• pp.288-293
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• 2013

A group of molecularly imprinted polymers (MIPs) with specific recognition for chiral (S)-ibuprofen were successfully prepared based on hydrogen bonds, utilizing ${\alpha}$-methacrylic acid as a functional monomer. The IR analysis of MIPs showed that the blue- and red-shifted hydrogen bonds were formed between templates and functional monomers in the process of self-assembly imprinting and re-recognition, respectively. According to UV-Vis analysis, we found that the ratio of host-guest complexes between template molecule and functional monomer was 1:1. The effect of cross-linker's quantity on the polymerization was studied by transmission electron microscope (TEM). The adsorption selectivity experiments indicated that MIPs exhibited higher selectivity to (S)-ibuprofen than those to ketoprofen and (R)-ibuprofen, (S)-ibuprofen's structural analogs.

• 한국세라믹학회지
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• 제46권5호
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• pp.462-466
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• 2009

We investigated the pore properties of inorganic membranes applied for hydrogen separation industry. Inorganic membranes were derived from polysilazanes. The thermal reactions involved were studied using thermogravimetry(TG) and IR spectroscopy(FTIR) of the solids. To determine the thermal effect of pore properties, polysilazanes were pyrolysed in inert atmosphere. Pore volume and BET surface area showed the maximum value at a pyrolysis temperature of $500^{\circ}C$. For amorphous SiCN membrane derived from polysilazanes, selectivity of $H_2/N_2$ was 4.81 at $600^{\circ}C$.

• Structural Engineering and Mechanics
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• 제84권6호
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• pp.733-741
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• 2022

The amount of natural gas that is used on a worldwide scale is continuously going up. Natural gas and acidic components, such as hydrogen sulfide and carbon dioxide, cause significant corrosion damage to transmission lines and equipment in various quantities. One of the fundamental processes in natural gas processing is the separation of acid gases, among which the safety and environmental needs due to the high toxicity of hydrogen sulfide and also to prevent wear and corrosion of pipelines and gas transmission and distribution equipment, the necessity of sulfide separation Hydrogen is more essential than carbon dioxide and other compounds. Given this problem's significance, this endeavor aims to extend the lifespan of the transmission lines' pipes for gas and oil. Zinc oxide nanoparticles made from the environmentally friendly source of Allium scabriscapum have been employed to accomplish this crucial purpose. This is a simple, safe and cheap synthesis method compared to other methods, especially chemical methods. The formation of zinc oxide nanoparticles was shown by forming an absorption peak at a wavelength of about 355 nm using a spectrophotometric device and an X-ray diffraction pattern. The size and morphology of synthesized nanoparticles were determined by scanning and transmission electron microscope, and the range of size changes of nanoparticles was determined by dynamic light scattering device.

• 멤브레인
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• 제22권2호
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• pp.77-94
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• 2012

내열성, 용매 저항성의 특징을 갖는 다공성 세라믹 소재를 이용한 무기 멤브레인이 기체분리(수소 분리, 이산화탄소 분리 등), 액체 분리(수처리, 폐수처리, 유기용매 분리 등) 등 여러 가지 분야로 그 응용이 확대되고 있다. 본 논문에서는 다공성 세라믹 멤브레인의 소재, 제조 방법에 따른 멤브레인의 구조 제어 및 성능 평가에 관한 연구를 소개하고, 멤브레인의 세공 크기에 따른 구조, 멤브레인의 특성을 이용한 여러 가지 기체 분리 및 액체 분리에 관한 연구 동향을 정리하였다.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 2003년도 추계 학술발표회 논문집
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• pp.45-49
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• 2003

• 멤브레인
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• 제20권3호
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• pp.210-216
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• 2010

IS (요오드-황)프로세스의 HI 분해반응 공정에서의 적용을 목적으로 지르코니아 코팅 지지체를 이용하여 CVD법에 의해 수소분리막을 제작하였으며, 분리막으로서의 가능성을 평가하였다. 제작한 막의 형상 및 Si의 분포를 파악하기 위해 SEM 및 EPMA를 이용하여 분석하였다. 지르코니아를 코팅한 지지체를 이용하여 제작한 막에 Zr-Si-O층이 존재한다는 것을 알 수 있었다. 제작한 막의 수소와 질소가스의 단일 성분 투과속도를 $300{\sim}600^{\circ}C$에서 측정하였다. $600^{\circ}C$에서 Z-1막에서의 수소투과속도는 $1{\times}10^{-7}\;mol{\cdot}Pa^{-1}{\cdot}m^{-2}{\cdot}s^{-1}$를 나타냈다. 질소에 대한 수소의 선택성은 Z-1 막에서 5.0, Z-2막에서 5.75를 나타냈다.

• 한국수소및신에너지학회논문집
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• 제22권3호
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• pp.372-379
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• 2011

A nuclear fusion fuel cycle plant is composed of various subsystems such as a hydrogen isotope storage and delivery system, a tokamak exhaust processing system, and a hydrogen isotope separation system. Korea shares in the construction of its ITER fuel cycle plant with the EU, Japan, and the US, and is responsible for the development and supply of the storage and delivery system. The authors thus present details on the development status of hydrogen isotope storage technologies for nuclear fusion fuel cycle plants. We have developed various hydride beds of different size. We have realized a hydrogen delivery rate of 12.5 $Pam^3/s$ with a typical 1242g-ZrCo bed.

• 한국수소및신에너지학회논문집
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• 제19권4호
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• pp.359-366
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• 2008

Hydrogen as a high-quality and clean energy carrier has attracted renewed and ever-increasing attention around the world in recent years, mainly due to developments in fuel cells and environmental pressures including climate change issues. In this processes for hydrogen production from fossil fuels, separation and purification is a critical technology. $(Ni_{60}-Nb_{40})_{95}-Pd_5$ alloy ingots were prepared by arc-melting the mixture of pure metals in an Ar atmosphere. Melt-spun ribbons were produced by the single-roller melt-spinning technique in an Ar atmosphere. Amorphous structure and thermal behavior were characterized by XRD and DSC. The permeability of the $(Ni_{60}-Nb_{40})_{95}-Pd_5$ amorphous alloy membrane was characterized by hydrogen permeation experiments in the temperature range 623 to 773 K and pressure of 2 bars. The maximum hydrogen permeability was $3.54{\times}10^{-9}[mol{\cdot}m^{-1}s^{-1}{\cdot}pa^{-1/2}]$ at 773 K for the $(Ni_{60}-Nb_{40})_{95}-Pd_5$ amorphous alloy.

• 한국수소및신에너지학회논문집
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• 제23권5호
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• pp.421-428
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• 2012

The Sulfur-Iodine (SI) thermochemical hydrogen production process is one of the most promising thermochemical water splitting technologies. In the integrated operation of the SI process, the $O_2$ produced from a $H_2SO_4$ decomposition section could be supplied directly to the Bunsen reaction section without preliminary separation. A $HI_x$ ($I_2+HI+H_2O$) solution could be also provided as the reactants in a Bunsen reaction section, since the sole separation of $I_2$ in a $HI_x$ solution recycled from a HI decomposition section was very difficult. Therefore, the Bunsen reaction using $SO_2-O_2$ mixture gases in the presence of the $HI_x$ solution was carried out to identify the effect of $O_2$. The amount of $I_2$ unreacted under the feed of $SO_2-O_2$ mixture gases was little higher than that under the feed of $SO_2$ gas only, and the amount of HI produced was relatively decreased. The $O_2$ in $SO_2-O_2$ mixture gases also played a role to decrease the amount of a impurity in $HI_x$ phase by only striping effect, while that in $H_2SO_4$ phase was hardly affected.

• 멤브레인
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• 제33권6호
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• pp.352-361
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• 2023

청정 연료인 수소를 생산하기 위해 현재 가장 널리 사용되는 기술인 증기 개질이다. 이 방법으로 생산된 수소는 일산화탄소와 같은 불순물을 함유하고 있어, 이를 연료전지와 같은 응용분야에 사용하기 위해서는 적절한 정제 과정을 반드시 거쳐야 한다. 최근 효과적인 정제 방법으로 분리막 기술이 각광받고 있다. 본 연구에서는 수소와 일산화탄소 혼합가스에서 수소 분리 및 회수를 위해 바이오가스 고질화용(biogas upgrading) 상용 폴리설폰(polysulfone) 고분자막의 활용 가능성에 대해서 평가하였다. 먼저, 사용한 상용막의 물리화학적 특성에 대해서 평가하였고, H₂/CO를 이용하여 stage-cut, 운전압력과 같은 다양한 조건에서의 상용막 모듈의 성능 평가를 진행하였다. 마지막으로, 평가 결과를 바탕으로 공정설계를 위한 시뮬레이션을 진행하였다. 본 연구에서의 상용 분리막 공정의 최대 H₂ 투과도와 H₂/CO 분리계수는 각각 361 GPU와 20.6을 기록하였다. 또한, CO 제거 효율은 최대 94%를 나타내었으며, 생산 수소 농도는 최대 99.1%를 달성하였다.