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SO2 가스가 황화반응된 CuO/γ-AI2O3 흡수제의 재생반응에 미치는 영향
정상문(Sang Mun Jeong),유경선(Kyung Seun Yoo),김상돈(Sang Done Kim) 한국화학공학회 1997 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.35 No.1
The effect of SO₂ gas on regeneration of the sulfated CuO/γ-Al₂O₃ sorbent by hydrogen gas has been determined in a thermogravimetric analyzer(TGA). The presence of SO₂ gas reduces the regeneration rate of the sulfated CuO/γ-Al₂O₃ sorbent and regeneration conversion of pseudoequilibrium state is observed. Equilibrium conversion decreases with increasing SO₂ concentration up to 15 vol% and then remains constant. Without SO₂ gas injection, the regeneration reaction by hydrogen gas resumes and the amount of desorbed SO₂ exhibits a constant value of 0.9μ㏖ SO₂/㎡ regardless of SO₂concentration and regeneration temperature employed.
전해환원 공정의 우라늄 산화물 환원 거동 모사를 위한 Phase-Field 이론 적용
박병흥,정상문,Park, Byung Heung,Jeong, Sang Mun 한국방사성폐기물학회 2018 방사성폐기물학회지 Vol.16 No.3
Under a pyro-processing concept, an electrolytic reduction process has been developed to reduce uranium oxide in molten salt by electrochemical means as a part of spent fuel treatment process development. Accordingly, a model based on electrochemical theory is required to design a reactor for the electrolytic reduction process. In this study, a 1D model based on the phase-field theory, which explains phase separation behaviors was developed to simulate electrolytic reduction of uranium oxide. By adopting parameters for diffusion of oxygen elements in a pellet and electrochemical reaction rate at the surface of the pellet, the model described the behavior of inward reduction well and revealed that the current depends on the internal diffusion of the oxygen element. The model for the electrolytic reduction is expected to be used to determine the optimum conditions for large scale reactor design. It is also expected that the model will be applied to simulate the integration of pyro-processing.
MnO<sub>2</sub>-HCS 복합체를 이용한 슈퍼커패시터의 전기화학적 특성
김은미,정상문,Jin, En Mei,Jeong, Sang Mun 한국청정기술학회 2018 청정기술 Vol.24 No.3
중공형 구형 탄소(hollow carbon spheres, HCS) 또는 구형 탄소(carbon spheres, CS)는 수열합성법에 의해 제조되었고 $MnO_2$를 증착하기 위한 탄소 지지체로 사용하였다. $MnO_2$는 화학적 레독스 증착법에 의해 HCS 또는 CS 표면에 증착하였다. 화학적 산화환원 증착법은 미립자 지지체의 표면에 다른 산화물 합성에 특히 효과적이다. $MnO_2$는 HCS 또는 CS의 표면에 일정한 슬릿 모양의 분포를 보였고 HCS 표면에서 보다 엉성한 슬릿 모양의 $MnO_2$ 입자가 생성되었다. $MnO_2-HCS$는 $20mv\;s^{-1}$의 스캔 속도에서 초기 사이클에서 약 $164.1F\;g^{-1}$의 정전용량을 나타내었고 1000 사이클 후에는 약 $141.3F\;g^{-1}$의 정전용량을 나타내었다. 1000 사이클 기준으로 $MnO_2-HCS$와 $MnO_2-CS$는 각각 86%와 78%의 용량유지율을 나타내었다. 이것은 HCS 표면에서 엉성한 슬릿모양의 $MnO_2$의 성장이 전해질의 흐름 및 전해질 내의 $Na^+$ 이온의 흡탈착이 보다 용이하여 나타난 결과로 생각된다. Hollow carbon spheres (HCS) and carbon spheres (CS) were prepared by a hydrothermal reaction and they were introduced as a substrate for the deposition of $MnO_2$ nanoparticles. The $MnO_2$ nanoparticles were deposited on the carbon surface by a chemical redox deposition method. After deposition, the $MnO_2$ nanoparticles were uniformally distributed on the carbon surface in a slit-shape, and sparse $MnO_2$ slits appeared on the HCS surface. The $MnO_2-HCS$ showed an initial specific capacitance of $164.1F\;g^{-1}$ at scan rate of $20mv\;s^{-1}$, and after 1,000 cycles, the specific capacitance was maintained to $141.3F\;g^{-1}$. The capacity retention of $MnO_2-HCS$ and $MnO_2-CS$ were calculated to 86% and 78% in the cycle performance test up to 1,000 cycles, respectively. $MnO_2-HCS$ showed a good cycle stability due to the mesoporous hollow structure which can cause a faster diffusion of the electrolyte and can easily adsorb and desorb $Na^+$ ions on the surface of the electrode.
전착법을 이용한 슈퍼커패시터용 다공성 Co(OH)₂ 나노플레이크 박막의 제조 및 전기화학적 특성
이현정 ( Hyeon Jeong Lee ),김은미 ( En Mei Jin ),정상문 ( Sang Mun Jeong ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.2
Porous Co(OH)₂ nano-flake thin films were prepared by a potential-controlled electro-deposition technique at various deposition voltage (-0.75, -1.0, -1.2, and -1.4 V) on Ti-mesh substrates for supercapacitor application. The potential of electrode was controlled to regulate the film thickness and the amount of Co(OH)₂ nano-flake on the titanium substrate. The film thickness was shown to reach the maximum value of 34 μm at -1.4 V of electrode potential, where 17.2 g of Co(OH)₂ was deposited on the substrate. The specific discharge capacitances were measured to be 226, 370, 720, and 1008 mF cm^{-2} in the 1st cycle corresponding to the films which were formed at -0.75, -1.0, -1.2, and -1.4 V of electrode potentials, respectively. Then the discharge capacities were decreased to be 206, 349, 586 and 866 mF/㎠, where the persistency rates were 91, 94, 81, and 86%, respectively.
MgCl2-CaCl2-NaCl 혼합용융염에서 Mg2+ 이온의 전기화학적 거동
류효열 ( Hyo Yeol Ryu ),정상문 ( Sang Mun Jeong ),김정국 ( Jeong Guk Kim ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.6
The electrochemical behavior of magnesium ions was examined by cyclic voltammetry in a molten MgCl2- CaCl2-NaCl salt. The reduction potential of magnesium ions was measured and those values were estimated with the variation of the concentration of MgCl2 and the temperature of molten salts. The diffusion coefficient of the Mg2+ ions has been determined at 660, 680, 700, 720 and 740 oC. The values were 8.79×10-6, 9.56×10-6, 1.17×10-5, 1.4×10-5 and 1.77×10-5 cm2 s-1, The activation energy for the diffusion processes of Mg2+ ions was found to be 70.28 kJ mol-1 by using the Arrhenius equation.