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공기(산소)가 첨가된 수성가스 전환반응용 Au/CeO₂ 촉매의 개발
서창규,정창렬,한종희,남석우,임태훈,홍성안,이호인 한국공업화학회 2003 응용화학 Vol.7 No.2
Au/CeO₂catalysts were prepared by deposition-precipitation and appled for water gas shift reaction supplied with oxygen in the presence of excess hydrogen and carbon dioxide. The catalysts were characterized by means of XRD, H₂-TPR CO chemisorption and XPS. The Au/CeO₂catalysts exhibited high catalytic activity in water gas shift reaction supplied with oxygen, showing markedly enhanced catalytic activities due to highly dispersed Au particles over CeO₂with small crystallite size and large surface area.
Gd-Fe 및 Tb-Fe 합금 박막의 자기적 성질 및 그에 미치는 시효처리와 보호막의 영향
이성래,서창규 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.3
The magnetic properties and their degradation kinetics of thermally coevaporated Gd-Fe and Tb-Fe amorphous alloy films during aging under atmospheric pressure and vacuum were studied using the torque magnetometry and polar Kerr rotation hysteresisgraphy. The perpendicular magnetic anisotropy existed in the range of 20-30 at%Gd and 15-35 at%Tb. The degradation of Ku during aging was increased with RE content and this was largely due to the rate and amount of the structureal relaxation and the oxidation with RE content. The activation energies for degradation was in the range of 0.61-1 eV and 0.47-0.91 eV for Gd-Fe and Tb-Fe respectively and the n values were increased and the activation energy were decreased with RE content. Al coated films have lower n values and higher activation energy than those of SiO coated films. Al was found to be more effective for protective coating than SiO at high temperature. Thickness of more than 500Å for SiO and 200Å for Al was found to be needed to protect the RE-TM alloy films from the oxidation.