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RISS 인기검색어
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- 저자 : 신기하(Ki Ha Shin) (검색결과 4 건)
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고온 소결된 촉매 산화물 전극의 재료 특성 및 유기물 분해능 연구
김광욱(Kwang Wook Kim),이일희(Eil Hee Lee),김정식(Jung Sik Kim),신기하(Ki Ha Shin),정붕익(Boong Ik Jung) 한국공업화학회 2002 공업화학 Vol.13 No.3
본 연구에서는 Ru과 Ir 산화물 전극의 소결 온도 변화에 따른 전극의 재료적, 전기 화학적 특성과 유기물 분해 특성을 보기 위하여 전극 표면저항, XPS, voltammogram 등과 4 CP 분해 시의 TOC가 측정되었으며, 각 산화물 전극에서 4 CP의 분해 경로의 예측을 위한 반응 중간 생성 물질을 GC Mass-spectroscopy에 의해 확인하였다. Ru과 Ir 산화물 전극은 기존 문헌에 알려진 전극 제조 소결온도인 400℃∼550℃를 넘는 650℃ 정도에서 가장 높은 유기물 분해율을 보였으며, 고온 소결 시 소결 시간의 증가는 Ti 지지체 자체를 산화시켜 전극 산화물의 무게 증가와 생성된 TiO_2의 전극 표면으로의 확산에 의하여 전극 활성이 저하되었고 이는 유기물 분해율을 감소시켰다. 고온 소결된 Ru과 Ir 산화물 전극은 저온 소결된 것과는 다른 유기물 분해 경로를 보이는 전극 표면 구조로 예측되며, 450℃에서 소결된 Ru 산화물 전극은 분자량이 큰 다양한 지방족 중간체를 생성시켰다. To study the material and electrochemical as well as the organic destruction properties of Ru and Ir oxide electrodes, which were sintered at different temperatures, surface resistivity, XPS, voltammogram, and TOC of 4 CP destruction at the electrodes were measured. The intermediates during the electrolysis were identified by a GC-Mass spectroscopy to predict the destruction path of 4 CP at the electrodes. At the sintering temperature of around 650 ℃, rather than 400 ℃∼550 ℃ as suggested in the literatures for the fabrication of Ru and Ir oxide electrodes, showed the highest organic destruction yield. During the high-temperature sintering, increasing the sintering time caused the oxidation of Ti substrate. This increased the oxide weight of the electrode and increased the solid diffusion of the generated TiO_2 to the electrode surface, decreasing the electrode activity and slow down the organic destruction rate. The destruction path of 4 CP at high temperature-sintered electrode was different from ones that was sintered at low temperature. The Ru oxide electrode sintered at 450 ℃ generated several aliphatic intermediates.
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공업화학 , 촉매 / 반응공학 : 이리듐 산화물 전극의 유기물 분해 성능 개선
김광욱(Kwang Wook Kim),이일희(Eil Hee Lee),신기하(Ki Ha Shin),정붕익(Boong Ik Jung),김광호(Kwang Ho Kim),김정식(Jung Sik Kim) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.2
This study has carried out a performance improvement of IrO_2 electrode for the purpose of organic destruction by sintering the electrode at a high temperature, and the material, electrochemical, and organic destruction properties of the electrode were evaluated by measurements of surface resitivity, TGA, XPS, AES, voltammogram, and TOC of 4CP destruction. A sintering temperature of around 650℃ rather than 400-550℃ suggested in the literatures for fabrication of Ir oxide electrode enhanced the organic destruction yield because IrCl_3 of the precursor solution on electrode surface was sufficiently converted to IrO_2. An additional oxide layer between IrO_2 layer and Ti substrate, to prevent a solid diffusion of TiO_2 due to oxidation of Ti substrate during high-temperature sintering, improved the organic destruction further so that the 4CP destruction yield raised to about 4 times higher than that by the conventional Ir oxide electrode. The destruction yield of 4CP solution with chloride ion at the improved electrode increased as much as that by RuO_2 electrode in the same solution.
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공업화학 , 촉매 / 반응공학 : 3 성분 혼합 Ru - Sn - Ti/Ti 산화물 전극 활성 및 전극 수명 특성 ( 2 )
김광욱(Kwang Wook Kim),이일희(Eil Hee Lee),김정식(Jung Sik Kim),신기하(Ki Ha Shin),김광호(Kwang Ho Kim) 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.2
Catalytic mixed oxide electrodes of Ru/Ti, Ru-Sn/Ti, and Ru-Sn-Ti/Ti effective to destruction of refractory organics in aqueous waste were studied in views of their electrochemical properties and lifetimes. The electrochemical activity of the Ru-based mixed oxide electrode increased almost linearly to the amount of Ru included in the oxide layer, and it decreased rapidly at sintering temperature over 550 ℃ because of decrease of the degree of non-stochiometry within Ru oxide. The electrode roughness increased linearly with the electrochemical activity and the number of coating layers on electrode. The lifetime of Ru oxide electrode was the longest at the sintering temperature of 450 ℃, and the sintering temperature did not affect lifetimes of Ru-Sn and Ru-Sn-Ti oxide electrodes. The lifetime of oxide electrode increased exponentially with the number of coating layers. The existence of Sn and Ti in the Ru-Sn-Ti oxide electrode generally had a bad effect on its lifetime. The electrochemical activity and the lifetime of Ru-Sn-Ti oxide electrode were the best at a specific ratio of Sn to Ti of 1.5.
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공업화학촉매 / 반응공학 : 3 성분 혼합 Ru - Sn - Ti / Ti 산화물 적극의 제조 및 재료 특성 ( 1 )
김광욱(Kwang Wook Kim),이일회(Eil Hee Lee),김정식(Jung Sik Kim),최정길(Jeong Gil Choi),신기하(Ki Ha Shin),이상훈(Sang Hoon Lee),김광호(Kwang Ho Kim) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.6
Fabrication and material properties of the catalytic oxide electrode, which is known to be so effective to destruct refractory organics in aqueous waste, were studied. A method to enhance the fabrication reproducibility of the oxide electrodes was tested for Ru, Ru-Sn, Ru-Sn-Ti oxide on the Ti substrate, and various physical and material characteristics of the oxide electrodes and an adhesive degree of the oxides to the substrate were examined with changes of sintering temperature, composition of metal oxides, and etching condition, using TGA, AES, XPS, EPMA, SEM and a tape test. The degree of non-stochiometry in the oxide, being attributed to the catalytic property of the oxide electrode, was evaluated. The etching condition of Ti substrate was found to have a severe effect on the fabrication reproducibility, the surface morphology. and the amount of oxide coated on the substrate of the oxide electrode. The metal oxide sintered below 600 ℃ was confirmed to have a non-stochiometric compound of MO_(2-χ) (0<x<1).
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