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안범종 ( Bum Jong Ahn ) 한국화학공학회 1981 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.19 No.1
The effective diffusivity in a porous catalyst can be measured simply in a gaseous binary system without the presence of chemical reaction. Stationary and dynamic methods are reviewed and several structural models to represent a porous medium are presented. These models contain the parametric coefficients which should be determined experimentally.
안범종 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.2
석유 유분 가운데 잔사유를 수첨 처리하면, 표면 피독과 함께 금속 성분이 침적되어 촉매 활성이 떨어지는 것으로 알려져 있다. 이때 활성 저하를 입자 안에서의 확산과 반응[식 (23)과 (24)]으로부터 계산하려면, 유효 확산 계수와 반응속도 상수를 입자 안의 각 위치에서 알아야 한다. 반응속도 상수가 달라지는 것은, 침적으로 말미암은 표면적의 변화와 피독에 의한 표면 활성의 변화로 나누어 보고자 한다. 공극과 침적의 확률 및 표면 피독에서 추론하여, 금속 성분의 침적으로 인한 활성 저하를 이론적으로 정리하고자 한다. 그 주요한 결과로는, 이들의 변화와 침적과의 관계를 무차원 식으로 얻었다. 공극과 침적의 확률로부터 접근하여, 유효 확산 계수의 감소[식 (7)]와 표면적의 축소[식 (8)]를 침적의 함수로 이끌어 내었다. 거기에 포함된 매개변수[식 (11)에서 λ]는 기공과 유기 금속 복합물의 크기의 비율이다. 한편 표면 활성의 변화는 표면피독과 침적의 속도로부터, 역시 침적의 함수[식 (19)]로 이끌어 내었다. 나아가 등온 조건에서, 하나의 촉매 입자에서 활성이 떨어지는 바를 살펴보았다. Primary causes of deactivation of hydrodemetallation catalysts are partial poisoning of the interior surface and pore plugging by deposition of metals. Local changes in effective diffusivity and reaction rate constant should be taken into account, to describe the drop in activity by intraparticle diffusion and reaction[Eq. (23) and (24)]. Local reaction rate constant varies with both changes in surface area and surface activity, along the position within the catalyst particle. Attempts are made to describe mathematically the deactivation of catalyst, resulting dimensionless equations for those changes. Derived from the probability of void and deposition, reduction of local effective diffusivity[Eq. (7)] and shrinkage of local surface area[Eq. (8)] are formulated as functions of deposits. Included parameter is turned out to be the ratio of size of organometallic compounds to the pore diameter[λ in Eq. (1l)]. The change in surface activity[Eq. (19)] is also given as a function of deposits, from the kinetics of surface fouling and deposition. The treatment is for a single, isothermal catalyst particle.
고재철,안범종,김승호,박영구 三陟大學校 産業科學技術硏究所 2004 産業科學技術硏究論文集 Vol.9 No.1
The purpose of this paper is to improve the performance of polymer electrolyte fuel cell(PEMFC) by studying the anode channel using commercial CFD program "Fluent". Simulations are done ranging from 0.5 to 3.0mm for different size in order to find the channel size which showes the highst hydrogen consumption. As the channel size make small, the hydrogen consumption appears higher in anode. When channel width is increased, the pressure drop in channel is decreased because total channel length is decreased, and land width is increased, the net hydrogen consumption is decreased because hydrogen is diffused under the land width. It is also found that the influence of hydrogen consumption is larger at different channel width than it at different land width. The change of hydrogen consumption with different channel depth isn't as large as it with different channel width, but channel depth has to be small as can as it does because it has influence on the volume of bipolar plates. It is investigated that the channel width = 1.0 mm, land width = 1.0 mm, channel depth = 0.5 mm, and this is considered as optimum channel size.