• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.207-208
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• 2014

고순도의 수소를 정제 및 분리하기 위한 팔라듐계 합금 수소분리막은 높은 수소 투과-선택 특성이 요구된다. 그러나 종래의 스퍼터 공정 조건으로 팔라듐계 분리막을 제조하면 주상정 구조에 기인하여 표면에 기공이 형성되게 된다. 본 연구에서는 개선된 스퍼터 시스템에서 고진공, 고온 및 높은 직류 전원 공정조건 하에 치밀하고 균일한 팔라듐/금 수소분리층을 제조하였다. 이와 같은 공정 조건에 의해 종래의 제조 공정 조건 보다 얇은 분리막을 제조하여 공정의 경제성을 향상 시켰으며, 기공이 포함되지 않은 수소분리층을 형성하여 수소 선택 특성이 무한대의 값을 가지는 것으로 관찰되었다.

• Journal of the Korean Chemical Society
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• v.22 no.4
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• pp.259-267
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• 1978

In order to find out the selective reducing characteristics of lithium borohydride, borane, and borane-lithium chloride (1 : 0.1) in the reduction of carbonyl compounds, five representative equimolar mixtures of carbonyl compounds were chosen; benzaldehyde-acetophenone, benzaldehyde-2-heptanone, 2-heptanone-benzophenone, acetophenone-benzophenone, and 2-heptanone-acetophenone, and reacted with limited amount of lithium borohydride, borane or borane-lithium chloride (1 : 0.1) in tetrahydrofuran (THF) at $0^{\circ}$. Borane-lithium chloride (1 : 0.1) showed the excellent selectivity, however, lithium borohydride and borane also exhibited good selectivity except for the 2-heptanone-acetophenone.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.156-157
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• 2014

수소 분리막은 수소 분리층과 지지체로 구분되며, 수소 분리막의 수소 투과 및 선택도는 지지체의 표면조도, 평탄도 및 거대기공 크기에 크게 의존한다. 본 연구에서는 표면연마 및 $ZrO_2$ 파우더 매립을 사용한 표면처리 공정을 통해 다 공성 스테인레스 강 지지체의 표면조도 및 평탄도와 거대기공을 제어함으로써 균일하고 치밀한 분리층을 형성 할 수 있었으며, 상용화 공정($350^{\circ}C{\sim}500^{\circ}C$, 1bar(${\Delta}P$))에서 무한대의 수소 선택도와 $17.5ml/min{\cdot}cm^2{\cdot}atm$의 수소 투과도를 얻을 수 있었다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.10
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• pp.114-119
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• 2006

In this paper, measurement of hydrogen gas using three kinds of gas sensors were studied for improving selectivity and quantification on hydrogen gas. Output characteristics for each sensors were analyzed to some concentrations of hydrogen gas. It was illustrated that the wide range of hydrogen gas concentrations upto 10,000[ppm] can be reliably measured from investigation of concentration ranges with high amplitudes and good resolutions. Also, the combinations of outputs from three kinds sensors were able to improve the selectivity of hydrogen gas.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.114.2-114.2
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• 2010

Fisher-Tropsch 반응을 통하여 생성되는 왁스는 황 또는 질소 성분을 포함하지 않으며 또한 방향족 및 중금속 성분이 없기 때문에 청정 수송유로써 사용이 가능하다는 장점이 있다. 그러나 Fisher-Tropsch 왁스는 그 분자량이 매우 큰 사슬형 탄화수소이기 때문에 수소첨가 분해반응을 통하여 중질유 range의 탄소수를 갖는 탄화수소로의 전환 기술이 반드시 필요하다. 이러한 수소첨가 분해반응에 사용되는 촉매는 강한 산점을 지니고 있는 양이온 교환 지르코니아가 대표적이라 할 수 있는데 최근 들어 강한 산점과 높은 산밀도, 그리고 기공의 모양과 크기에 따라 특정 반응이 제어되거나 활성화되는 형상선택성을 가지고 있기 때문에 다양한 반응에 촉매로 사용되는 제올라이트에 Pt 등의 귀금속을 담지한 촉매를 사용하여 Fisher-Tropsch 왁스의 전환율 및 중질유분의 선택도를 높이는 기술에 대한 연구가 활발히 진행되고 있다. 따라서 본 연구에서는 다양한 제올라이트 촉매에 귀금속을 담지하여 촉매를 제조하고 1L 급 고압 배치형 반응기를 이용하여 Fisher-Tropsch 왁스의 수소첨가 분해반응에 의한 중질유 제조 실험을 수행하고 그 결과를 고찰하였다.

• Proceedings of the KIEE Conference
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• 2007.04b
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• pp.125-127
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• 2007

본 논문에서는 세 가지 종류의 가스센서를 사용하여 수소가스에 대한 정량화 및 선택도를 향상시키기 위한 연구를 수행하였다. 여러 가지 수소가스 농도에 대한 각 가스센서들의 출력을 측정하였고 높은 출력과 분해능특성을 보이는 농도범위를 분석한 결과 세 가지 종류의 센서의 사용은 10,000ppm까지의 광대역의 수소 가스농도를 신뢰성 있게 측정할 수 있는 가능성을 보여주었다. 또한 어떠한 농도의 메탄(CH4) 및 일산화탄소에 대한 출력과 수소에 대한 출력을 비교한 결과 세 가지 센서의 출력을 조합하면 수소가스의 선택성을 향상시킬 수 있는 것으로 나타났다.

• Applied Chemistry for Engineering
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• v.19 no.1
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• pp.59-65
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• 2008

The equilibrium solubilization capacity of the mixture of hydrocarbon oils by $C_{12}E_8$ nonionic surfactant micellar solution was measured at $23^{\circ}C$ by gas chromatography (GC) analysis. Experimental results indicated that the solubilization capacity for pure alkanes was found to decrease almost linearly with the alkane carbon number (ACN) of the hydrocarbon oil. For the binary mixture systems of the hydrocarbon oils both selective and nonselective solubilization behaviors were observed depending on the difference in ACN of the two hydrocarbon oils. Equilibrium solubilization tests for the hydrocarbon oil mixtures in $C_{12}E_8$ surfactant solutions such as the three n-octane/n-nonane, n-nonane/n-decane and n-decane/n-undecane mixture systems suggest almost non-selective solubilization. On the other hand, the n-octane/n-decane and n-octane/n-undecane systems, where difference in ACN of the two hydrocarbon oils is greater than 1, selective solubilization in favor of n-octane was conclusively demonstrated.

• Membrane Journal
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• v.11 no.3
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• pp.124-132
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• 2001

Silica membranes were prepared on a porous ${\alpha}$-alumina tube with pore size of 150nm by sol-gel and chemical vapor deposition(CVD) method for hydrogen separation at high temperatures. Silica and ${\gamma}$-lumina membranes formed by the sol-gel method possessed a large amount of mesopores of a Knudsen diffusion regime. In order to improve the $H_2$ selectivity, silica was deposited in the sol-gel derived silica/${\gamma}$-alumina layer by thermal decomposition of tetraethyl orthosilicate(TEOS) at $600^{\circ}C$. The CVD with forced cross flow through the porous wall of the support was very effective in plugging mesopores that were left unplugged in the membranes. The CVD modified silica/alumina composite membrane completely rejected nitrogen permeation and thus showed a high $H_2$ selectivity by molecular sieve effect. the permeation of hydrogen was explained by activated diffusion and the activation energy was 9.52kJ/mol.

• Korean Chemical Engineering Research
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• v.45 no.3
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• pp.219-225
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• 2007

The equilibrium solubilization capacity of pure hydrocarbon oils by 2.5 wt% $C_{12}E_8$ nonionic surfactant solution was measured at $30^{\circ}C$ by gas chromatography (GC) analysis. Experimental results indicated that the molar solubilization ratio (MSR) for pure alkanes was found to decrease almost linearly with the alkane carbon number (ACN) of the hydrocarbon oil. For the binary mixture systems of the hydrocarbon oils both selective and nonselective solubilization behaviors were observed depending on the difference in carbon number of the two hydrocarbon oils. Equilibrium solubilization tests for the two n-octane/n-nonane and n-nonane/n-decane mixture systems in $C_{12}E_8$ surfactant solutions suggest slightly selective solubilization in favor of n-octane, but the small difference in solubilization rates between two hydrocarbon oils does not allow ruling out non-selective solubilization for these particular systems. This is certainly not the case for the n-octane/n-decane mixture, for which selective solubilization was conclusively demonstrated by GC analysis data.

• Applied Chemistry for Engineering
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• v.19 no.4
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• pp.432-438
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• 2008

Hydrogenation reactions of p-toluidine over Ru/C were performed while varying reaction temperature, the hydrogen pressure, catalyst loading, solvent, and alkali additive and the effects on the reaction rates and product distribution were examined. 4-Methylcyclohexylamine was generated as a main product and bis(4-methyl cyclohexyl)amine was obtained as a resentative side-product for the hydrogenation reaction of p-toluidine. The selectivity of MCHA decreased with reaction temperature and the hydrogen pressure while increased with catalyst loading. IPA was the best solvent for MCHA. A mechanism of hydrogenation reaction of p-toluidine was suggested from the results. It was found that the presence of alkali salt increased MCHA by reducing BMCHA and rates of hydrogen reaction increased.