• 통합자연과학논문집
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• 제4권3호
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• pp.177-181
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• 2011

The catalytic dehydrocoupling of bis(1-sila-3-butyl)benzene 1 and 2-phenyl-1,3-disilapropane 2 by $Cp_2ZrCl_2$/Red-Al and $Cp_2ZrCl_2$/n-BuLi was reported to compare their catalytic efficiency. The dehydrocoupling of monomeric silanes 1 with the $Cp_2ZrCl_2$/Red-Al and $Cp_2ZrCl_2$/n-BuLi combination catalysts produced two phases of polymers: one is a highly cross-linked insoluble solid, and the other is noncross-linked or slightly cross-linked soluble oil and could be a precursor for the solid polymer. The dehydrocoupling of 2 with the $Cp_2ZrCl_2$/n-BuLi combination catalyst similarly produced two phases of polymers. By contrast, the catalytic reaction of 2 with the $Cp_2ZrCl_2$/Red-Al combination catalyst produced a soluble polymer via redistribution/dehydrocoupling process.

• 사물인터넷융복합논문지
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• 제7권3호
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• pp.75-80
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• 2021

NOx의 배출저감 방법으로 선박용 디젤엔진의 최적화만으로는 배기가스의 NOx 배출량 제한을 만족시킬 수 없기 때문에 반드시 배기가스를 후처리하여 NOx를 저감할 수 있는 방안이 요구된다. 본 연구에서는 현재 개발 중에 있는 선박용 SCR 촉매 유닛 일체형 덕트용 오일 버너 시스템에서 요소수를 NH3로 효과적으로 변환하기 위한 이류체 노즐과 믹싱 챔버 덕트에 관한 설계 타당성 여부를 속도분포 및 온도분포에 대한 전산열유동 해석을 통해 검토하고자 한다.

• Korean Chemical Engineering Research
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• 제61권2호
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• pp.328-339
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• 2023

Methanol steam reforming (MSR) is a promising method for hydrogen supplying as a critical step in hydrogen fuel cell commercialization in mobile applications. Modelling and understanding of the reactor behavior is an attractive research field to develop an efficient reformer. Three-layer feed-forward artificial neural network (ANN) and Box-Behnken design (BBD) were used to modelling of MSR process using the Cu-SiO₂ aerogel catalyst. Furthermore, impacts of the basic operational variables and their mutual interactions were studied. The results showed that the most affecting parameters were the reaction temperature (56%) and its quadratic term (20.5%). In addition, it was also found that the interaction between temperature and Steam/Methanol ratio is important on the MSR performance. These models precisely predict MSR performance and have great agreement with experimental results. However, on the basis of statistical criteria the ANN technique showed the greater modelling ability as compared with statistical BBD approach.

• 한국자동차공학회논문집
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• 제12권2호
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• pp.62-68
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• 2004

To comply with stringent exhaust emission standards, it is necessary to reserch on some better quality of automotive fuels. Sulfur in fuels is sulfur compound by DOC and then it caused to the increase of PM on the surface of the catalyst. This research is focused on diesel emission characteristics and poisoning effect on Diesel Oxidation Catalyst when Ultra Low Sulfur Diesel(ULSD) and biodiesel are applied simultaneously. The biodiesel is used to improve viscosity of fuel specially in fuel injection system of engine since the introduction of ULSD may degrade viscosity in the process of desulfurization. Furthermore, this study may provide some basic data for the design of emissions reduction technology.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2004년도 제29회 KOSCI SYMPOSIUM 논문집
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• pp.217-222
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• 2004

In recent year, as the current and future emission regulations go stringent, the research of exhaust manifold and CCC has become the subject of increasing interest and attention. This study is concerned with the systematic approach to improve catalyst flow uniformity and light-off behavior through the basic understanding of exhaust flow characteristics. Computational approach to the unsteady compressible flow for exhaust manifold of 4-1 type and 4-2-1 type and CCC system of a 4-cylinder DOHC gasoline engine was performed to investigate the flow distribution of exhaust gases. In this study, through calculation, the effects of geometric configuration of exhaust manifold on flow structure and its maldistribution in monolith were mainly investigated to understand the exhaust flow patterns in terms of flow uniformity. Based on the design guidance resulting from this fundamental study, the flow uniformity of 4-2-1 type exhaust manifold demonstrated the more improved exhaust characteristics than that of the 4-1 type one.

• 한국산업융합학회 논문집
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• 제6권3호
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• pp.171-176
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• 2003

The poly(triazine bissulfide) synthesized from 6-dibutylamino-1,3,5-triazine-2,4-dithiol with bis(4-chloro-3-nitrophenyl) sulfone in the presence of the phase transfer catalyst, the maximum algebra viscosity (0.57 dL/g) is stable at reaction temperature of $60^{\circ}C$ overall. We could not acquire the good result about solubility, thermal property, and molecular weight to make cast film, we made base for the synthesis of functionalization polymer material.

• 한국대기환경학회지
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• 제19권5호
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• pp.541-549
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• 2003

A basic experimental study was conducted in order to find the optimum combustion control technology to decrease the thermal NO$_{x}$, by applying the catalytic combustion method with natural gas. NO$_{x}$ emission increased with increasing space velocity due to temperature rising in the furnace. In order to overcome the low resistance to high temperature, secondary air was supplied to the CST combustor. The following secondary fuel formed combustible mixture in part, which resulted in steep increase of the exiting temperature of the 2nd catalyst bed. It led to the more generator of NO$_{x}$, 30∼60% of the 1 st catalyst bed. It might be due to the potential increase of thermal NO$_{x}$.

• 환경위생공학
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• 제14권2호
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• pp.113-119
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• 1999

In this study, the incineration of MEK and toluene was studied on a Pt supported alumina catalyst at temperature range from 200 to $350^{\circ}C$. An approach based on the Mars-van Krevelen rate model was used to explain the results. The object of this study was to study the kinetic behavior of the platinum catalyst for deep oxidation. The conversions of MEK and toluene were increased as the inlet concentration was decreased and the reaction temperature was increased. The maximum deep conversion of MEK and toluene were 91.81% and 55.69% at $350^{\circ}C$, respectively. The ${\kappa}_3$ constant increases with temperature faster than the ${\kappa}_1$ constant, that is, the surface concentration of ($VOCs{\cdots}O$) is higher than that of (O) at higher temperature according to the Mars-van Krevelen mechanism. Also the activation energy of toluene was larger than MEK for toluene is aromatic compound which have stronger bonding energy.Therefore, the catalytic incineration kinetics of MEK and toluene with Mars-van Krevelen mechanism could be used as the basic data for industrial processes.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2011년도 춘계학술대회
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• pp.205-227
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• 2011

On this study, the test for air-purification was executed as using the UV lamp and the UV lamp on which the TiO2 catalyst had been deposited with glass fiber in the reactor chamber. It aimed at the basic data of air-purifier as assessing the features of removing abilities for various contaminants including CH3COOH, NH3, NO, and SO2 as varying the number of TiO2 coating, the wave of UV lamp, and the amount of additive CaO as variables.

• 한국안광학회지
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• 제9권2호
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• pp.481-489
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• 2004

Poly(triazine bissulfide)s는 상간이동촉매하에서 bis(4-chloro-3-nitrophenyl)sulfone와 6-dibutylamino-1,3,5-triazine-2,4-dithiol로도 합성하였으며, 또한 m-dibromide xylene와 p-dibromide xylene으로 cetyltrimethyl ammonium bromide와 함께 $70^{\circ}C$에서 24시간 동안 6-dibutylamino-1,3,5-triazine-2,4-dithiol로 반응시켜서도 합성하였다. 캐스트필름을 만들기 위해서 합성한 이들에 대한 용해도, 열적 성질, 평균분자량 등에 대해서 좋은 결과를 얻었다. 이러한 결과는 기능성 광학플라스틱 재료인 고분자물질을 합성하는데 있어서 중요한 것임을 보여주는 것이다. 최대대수정도는 $50{\sim}60^{\circ}C$이상에서 0.57~1.40dl/g의 값을 보였다.