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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.
라만 분광학과 분자모델링을 이용한 메탄 및 육불화황 혼합 가스 하이드레이트 성장 거동 연구
임준혁(Jun-Heok Lim),이주동(Ju Dong Lee),박성수(Sung Soo Park),엄기헌(Ki Heon Eom),원용선(Yong Sun Won) 한국청정기술학회 2013 청정기술 Vol.19 No.4
라만 분광학과 분자 모델링을 이용하여 메탄과 육불화황의 혼합 기체 가스 하이드레이트의 성장거동을 연구하였다. 라만 분광학 결과에 의하면 메탄을 객체 가스로 사용할 경우 메탄이 물 분자로 이루어지는 가스 하이드레이트 호스트 구조 내의 큰 동공을 채우고 차례로 작은 동공이 채워지게 되는데 반하여 육불화황을 혼합한 경우 육불화황과 메탄이 경쟁적으로 큰 동공을 채우고 이어 작은 동공에는 메탄만 채워지는 방식으로 전체 가스 하이드레이트 구조가 안정화됨을 관찰하였다. 분자 모델링에 의한 결합에너지 계산 결과 큰 동공의 경우 육불화황은 -26.9 kcal/mol, 메탄은 -24.2 kcal/mol의 결합에너지를 보여 육불화황이 채워지는 것이 약간 더 안정함을 알 수 있었고 작은 동공의 경우 육불화황은 1.2 kcal/mol, 메탄은 -22.0kcal/mol로 큰 크기의 육불화황이 작은 동공에는 채워질 수 없음을 보여주었다. 이와 같은 접근법은 향후 다양한 객체 기체 가스 하이드레이트의 성장거동을 예측하는데 적용될 수 있을 것이다. The growth behavior of CH₄ and SF6 mixture gas hydrate has been investigated by a combined approach of Raman spectroscopy and molecular modeling. Raman spectroscopy results presented that when CH₄ is used only, CH₄ guest molecule is inserted first into the large cavity of the host structure built by HCH₄ O molecules and then into the small cavity to stabilize the whole gas hydrate structure. In the other hand, when SF6 is mixed together, SF6 is favored over (or competing with) CH₄ in being inserted into the large cavity and the small cavity still prefers CH₄ insertion. The calculations of binding energies clearly supported this. While SF6 has a binding energy of -26.9 kcal/mol a little lower than -24.2 kcal/mol of CH₄ in the large cavity, SF6 and CH₄ has 1.2 kcal/mol and -22.0 kcal/mol, respectively, in the small cavity. It indicates that the sizable SF6 is not preferred in the small cavity but has a relative energetic advantage over CH₄ in the large cavity.
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.
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.