반경흐름 고정층 반응기의 해석 : Ⅰ.내경에 대한 외경의 비의 영향 Ⅰ.Effect of ratio of the inner radius to the outer one.

韓道興 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.2

This paper examines the effect of ratio of the inner radius to the outer one ξ₁ on the conversion of isothermal single reaction in a radial flow fixed-bed reactor. The velocity of reactant gas is only related to ξ₁at the given feed condition and catalyst volume, so that the conversion of radial flow fixed bed is affected by the values of ξ₁. The results of exact and numerical analysis show that lower values of ξ₁ give higer conversion for the positive reaction order and lower conversion for the negative ones, but the values of ξ₁ have no effect on the conversion for the zeroth order reaction or in the plug flow reactor.

금속담지촉매상의 에틸렌의 수소화반응에서 속도다중성에 대한 연구

한도흥 嶺南大學校 工業技術硏究所 1989 연구보고 Vol.17 No.2

Ethylene hydrogenation experiments were carried out respectively over 0.01wt.% pt/?? -Al₂O₃and 0.05wt.% pt/α-Al₂O₃ catalysts and rate multiplicity including ignition and extinction points was found. Over 0.01 wt.% pt/?? -Al₂O₃catalyst, the width of rate-concentration hysteresis loop increased with hydrogen concentration, but above some hydrogen concentration the extinction point abruptly increased and existed at very high ethulene concentratoin. Over 0.05wt.% pt/α-Al₂O₃, extinction points were found on the decreasing path of ethylene concentration but ignition points could not be found on any path. The difference between feed temperature and catalyst layer temperature is small at a narrow width and much large at a very wide width. This result suggests that the multiplicity in ethylene hydrogenation may be caused by the coupling effect of kinetic and heat transfer limitation.

규산 나트륨으로부터 THF에 의해 추출된 규산을 이용한 Mullite 전구체 제조시 촉매에 대한 영향

정흥호,박은희,김도수,정호승,노재성 공주대학교 자원재활용신소재지역협력센터 2000 2차년도 센터 사업 성과집 Vol.2000 No.1

Sol-Gel법으로 Aluminum isopropoxide[Al(i-OC3H7)3]와 규산나트륨로 부터 THF로 추출한 규산을 사용하여 mullite 겔 분말 제조시 산염기촉매의 영향에 관하여 XRD, TGA. SEM, 및 BET를 이용하여 연구하였다. 산성촉매로는 염산 (HCl)과 질산(HNO3)을, 염기성촉매로는 암모니아 (NH4OH)를 사용하였다. 촉매에 따른 중량 감소는 HCI=32.6% > HNO3=25.43% > Non=24.0% > NH4OH=22.5% 순서로 나타났다. 입자의 형태는 산성촉매인 경우 구형의 입자를, 염기능촉매의 경우는 구형이 아닌 입자형태를 나타내었다. 1400℃에서 하소한 분말은 촉매의 종류에 관계없이 0.05∼0.1㎛ 크기의 매우 미세한 입자들의 응집체임을 알 수 있었다. 그리고 촉매의 종류에 관계없이 온도가 증가할수록 흡착할 수 있는 세공이 줄어듬을 알 수 있었고, 염기 촉매를 사용하는 경우의 mullite 비표면적 변화가 거의 없는 내열성을 가지고 있었다. Effect of catalysts, which was catalyzed by acid(HCl and HNO3) and base(NH4OH), on characteristics of the mullite powders prepared by sol-gel method was investigatad by XRD, TGA, SEM and BET. As a result, weight loss as a function of catalysts was in order of HCI=32.6% > HNO3=25.43% > Non=24.0% > NH4OH=22.5%. The mullite powder dried at 100℃ appeared spherical shape in acid catalyst and different shape in base catalysts but sintering powder at 1400℃ appeared very fine particle of 0.05~0.1 ㎛ ragardless of catalysts. In all case, the pore quantity, which was capable to adsorption, was decreased with increasing temperature. In base catalyst, no change of special surface area in mullite appeared.

무용교육 기대효과에 따른 제요인에 관한 연구

정행도,박근희 명지대학교 예체능연구소 2003 藝體能論集 Vol.14 No.-

The purpose of this study was to identify effects of expectation whose are majonng in dance In order to get data, Self-administrated questionnaire was employed students(total 169 male 93%, female 93%) which major in dance in seoul & kyungki province. All data were analyzed by two-way ANOVA. The results of the research follow. 1. The effects of expectaion of dance education about increased physical fitness were differenciated from each university, The effects of expectation of dance education about increased physical fitness development were high in physical educatuon colleage. because they tried find in physical capacity development of dance education. 2. The effects of expectation about increased were high in art colleage because they tried find in physical capacity development of dance education. Also, the students who major in dance in art colleage focused in increasing quality of art. 3. The increasing of social through dance education were low expected value in university, year and minor major. The results showed the students who irujor in dance in art colleage thought uneffected dance education on increasing quality of social

금속담지촉매상에서 다중반응속도에 대한 수치해석

한도흥 嶺南大學校 工業技術硏究所 1989 연구보고 Vol.17 No.2

Numerical examples show that clock wise hysteresis loop can exist in the hydrogenation of ethylene over pt catalyst when one molecule of ethylene is chemisorbed on one atom of platinium, but rate multiplicity cannot be found when one molecule of ethylene is chemisorbed associatively on two atoms of platinium. Also numerical analysis shows that rate multiplicity can exist in the case of associative adsorption of ethylene on the two site of platinium by considering hydrogen spillover to support.

CO 산화반응에서 지속진동에 관한 연구

양해영,한도흥,하병환 嶺南大學校 工業技術硏究所 1994 工業技術硏究所論文集 Vol.22 No.2

Sustained oscillation, including a constant amplitude of less than 10℃ in temperature and a short period between several seconds and several minutes, was experimentally found in the CO oxidation over fixed bed of platinium/γ-alumina catalysts. From this study, it was believed that the oscillation could occur within the kinetic region in exclusion of heat transfer limitation. On the other hand, under some more strong heat transfer limitation,the temperature-oscillation had a long period of several ten minutes and two types of concentration-oscillation, which periods were short and long, could simultaneously exist at one period. Finally, under a strong heat transfer limitation, the oscillation disappeared but rate-multiplicity phenomenon only appeared.

전자빔을 이용한 공기중 VOC 분해반응 특성

원양수,한도흥,박완식,Tatiana Stuchinskaya,이홍승 영남대학교 환경문제연구소 2000 環境硏究 Vol.20 No.1

공기중 휘발성유기화합물의 처리를 위해 전자빔 가속기를 이용하여 Trichloroethylene(TCE)의 분해특성에 대해 연구하였다. TCE를 포함한 공기는 서로 다른 반응분위기, 초기농도의 변화, 수증기 존재유무와 같은 변수하에서 분해실험이 행해졌다. 산소를 반응분위기가스로 사용하였을 경우 최대분해율이 나타났는데, TCE 초기농도 2000 ppm에 대해 20kGy에서 99%의 분해율을 보였다. TCE 농도는 산소와 공기 조건하에서 지수함수적으로 감소했으며, TCE 분해효율에 대한 수증기 효과가 행해졌다. 수증기 (5600ppm) 존재하에서 TCE분해율은 수증기가 존재하지 않을 경우보다 약 10% 높게 나타났다. 1차 생성물로 Dichloroacetic acid, Dichloroacethyl chloride, Dichloroacethyl ester acetic acid 등이 생성되었고 분해와 산화반응을 통해 CO, CO2로 전환되었다. 또한 Perchloroethylene, Hexachloroethane, Chlorofona Carbon tetrachloride와 같은 과염소탄소 화합물이 생성되었다. Decomposition of trichloroethylene (TCE) in electron beam irradiation was examined in order to get information on treatment of VOC/air. Air containing vaporized TCE has been studied in a flow reactor with different reaction environments, various initial TCE concentration and in presence and absence of water vapor. Maximum decomposition was observed in oxygen reaction environment and degree of decomposition was about 99 % at 20 kGy for 2000 ppm initial TCE. The concentration of TCE exponentially decreased with dose in oxygen and air. The effect of water vapor on TCE decomposition efficiency was examined. The decomposition of TCE in presence of water vapor (5600 ppm) was by ca. 10% higher than in absence of water vapor. Dichloroacetic acid, dichloroacethyl chloride and dichloroethyl ester acetic acid which were identified as primary products, were decomposed and oxidized to give CO and CO2. Perchloroethylene, hexachloroethane, chloroform and carbon tetrachloride were also observed as highly chlorinated products.

循環 흐름을 가진 固定層 反應器의 不安定性에 관한 硏究

梁海永,韓道興,李明浩 嶺南大學校 工業技術硏究所 1993 工業技術硏究所論文集 Vol.21 No.1

In this study we observed the possible existence of multiple steady states for CO oxidation over Pt/Boehmite catalysts, which is one of instabilities, and also analyzed numerically these phenomena with some proper reactor models. The form of our reactor was a non-adiabatic fixed bed with recycle. The reactor models include both one phase model with plug flow and two phase model with heat transfer resistance between gas phase and solid one. Especially, it was attempted to explain the multiplicity features with a very wide region, whose features could not have been clearly explained by means of any other model, by the modified two phase model which includes a term related with memory effect of catalyst temperature. The experiments showed that the effect of recycle ratio on multiplicity region could not be revealed definitely for our experimental conditions. This may arise from the facts that the multiplicity for the CO oxidation over Pt/Boehmite cataysts resulted mainly from strong heat transfer limitation rather than from mixing effect related with recycle flow since the CO oxidation was a reaction with both very high generation and rapid reaction rate.

EGDA 기능성 모노마로 희석된 Epoxy Acrylate의 전자빔 경화 및 코팅

조병기,윤경용,Petrov, S.E.,이재민,이정희,한도흥 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1

Electron beam curing of acrylated epoxy resin diluted with mono-functional monomer EGDA has been investigated under circumstances contacted with air and without air. The formulated resin in contact with N2 or covered with film could be cured up to 95% even with low dose of 5kGy and the surface of cured resin became very hard, but cured resin in existence of oxygen and without any additive had a low degree of curing and the surface became sticky due to insufficient curing. Additives such as curing agent P-115 or initiator BPO could increase the degree of curing to more or less one, but these additives could not remove completely surface stickiness. While, at high dose(more than 100kGy), addition of BPO were possible to make the irradiated surface of the resin be non-sticky even in existence of air. Degree of curing of the resin which contained pigment was very high at dose of around 20kGy. Elongation and stress at break on the cured resin with ferric oxide pigment were be higher than with non-ferric oxide pigment. Adhesion and anti-firing of the resin coated on cement block could be excellent.

Variational Autoencoder기반 교량 손상 위치 추정의 개념적 방법

이강혁(Lee, Kanghyeok),정민웅(Chung, Minwoong),전찬웅(Jeon, Chanwoong),신도형(Shin, Do Hyoung) 대한토목학회 2019 대한토목학회 학술대회 Vol.2019 No.10