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용융슬래그로부터 합성된 제올라이트 이용한 해수 중의 N, P 제거
임준혁,정진영,이성우,홍성호,김경희,이제근 한국공업화학회 2003 응용화학 Vol.7 No.1
This study examined, as the one way of using zeolite, the about the removal of ammonia nitrogen and phosphorus that cause the eutrophication occurred the adjoining seas.4A type zeolite was used as an adsorbent to remve NH_4-N, PO_4^3-P ion in the artificial seawater. Zeolite is more required than in the fiesh water, under the same conditions, in order to remove NH_4-N in the sea water. The lower the thickness of NH_4-N is in the early stage, the more Freundlich type equation the value of 1./n increases. In case of PO_4^3-P indicated that the removal efficiency was relatively independent of PO_4^3-P concentration. Freundlich parameter 1/n has the value nuder 2. So it shows that absorption is made with relatively ease.
A Simulation of Electrochemical Kinetics for Gas Liquid Solid Phase of MCFC Anode
Lim, Jun Heok,Yi, Gyeong Beom,Suh, Kuen Hack,Lee, Jea Keun,Kim, Yun Sung,Chun, Hai Soo 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.6
A porous Ni-Al alloy anode for the molten carbonate fuel cell has been developed to enhance the creep resistance of the anode as well as to minimize the electrolyte loss. A dual-porosity filmed agglomerate model for the Ni-Al alloy anode has been investigated to predict the cell performance. The major physicochemical phenomena being modeled include mass transfer, ohmic losses and reaction kinetics at the electrode-electrolyte interface. The predicted polarization curves are compared with the experimental results obtained from a half cell test. The model predicted very well the steady-state cell performance at the given conditions that characterize the state of the electrode.
Modified Agglomerated Film Model Applied to a Molten Carbonate Fuel Cell Cathode
Lim, Jun Heok,Kim, Tae Keun 한국환경과학회 1996 한국환경과학회지 Vol.5 No.5
A dual-porosity filmed agglomerate model for the porous cathode of the molten carbonate fuel has been investigated to predict the cell performance. A phenomenological treatment of molecular, kinetic and electrode parameters has been given. The major physical and chemical phenomena being modeled include mass transfer, ohmic losses and reaction kinetics at the electrodeelectrolyte interface. The model predicts steady-state cell performance given the above conditions that characterize the state of the electrode. Quasi-linearization and finite difference techniques are used to solve the coupled nonlinear differential equations. Also, the effective surface area of electrode pore was obtained by mercury porosimeter. The results of the investigation are presented in the form of plots of overpotential vs. current density with varied the electrode material, gas composition and mechanism. The predicted polarization curves are compared with the empirical data from 1 ㎠ cell. A fair correspondence is observed.
하이드록시 아파타이트를 이용한 fluorapatite 미립자 합성
임준혁 ( Jun Heok Lim ),정헌석 ( Hun Seok Jung ),장정국 ( Jung Goog Jang ),이경학 ( Gyeong Hak Lee ) 한국공업화학회 2010 응용화학 Vol.14 No.1
As an inorganic component of shark teeth and some exoskeletons of molluscs, fluoroapatite, Ca10(PO4)6F2, is a highly relevant biomineral. Human teeth consist mainly of carbonated hydroxyapatite, Ca5-x(PO4CO3)3OH, and do not contain high levels of fluoride (overall less than 0.1 wt %); on the surface of human teeth, between 0.05 and 0.1 wt % fluoride was found. However, the interaction between fluoride and calcium phosphate is important to understand the formation and dental protection of teeth. In this paper we report the synthesis of fluroapatite of various size and chemical composition under simple and relatively mild reaction conditions. Precipitation method and ultrasonic method were used for the fabrication of fluorapatite. And various solutions were used to different shape of fluorapatite. Using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and powder X-ray diffraction (XRD), the mechanism of how these structures formed was explored.
용융탄산염 연료전지용 Perovskite 전극에 대한 연구 - 1. 제조방법 , 전기전도도 및 용해도
임준혁(Jun Heok Lim),전해수(Hai Soo Chun) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1
The perovskite compounds[La₁, _xSr_xCoO₃(x=0, 0.2. 0.4), La_(0.8)Sr_(0.2)CuO₃] were selected as the possible altemate materials for the MCFC cathode and were synthesized by the citric acid and the ethylendiaminetetraacetic acid(EDTA) sol-gel methods. Those equilibrium solubilities were investigated in molten Li/K(=62/38 mole%) carbonates at 650℃. And the conductivity of perovskite at high temperature was measured. With increasing Sr contents, the solubility and conductivity of perovskite cathodes were increased. With increasing sintering time, the solubility was decreased.
임준혁 ( Jun Heok Lim ),정헌석 ( Hun Seok Jung ),이희동 ( Hui Dong Lee ),안우영 ( Woo Yeong Ann ) 한국공업화학회 2010 응용화학 Vol.14 No.1
In the zinc powder fabrication process, about 5 to 10 wt% of zinc powder were unfit for the criteria of painting industry. The flake type zinc powder was produced from the residual product of zinc dust. In this study, the zinc dust were crashed in the attrition mill. Also, the operating condition of milling process were studied.