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TiO₂-ZrO₂와 γ-Al₂O₃에 담지된 Co-Mo 촉매의 특성비교 및 수첨탈황반응에 관한 연구
김경림,고을석,박해경,이재열 연세대학교 대학원 1993 延世論叢 Vol.29 No.1
Hydrodesulfurization of thiophene were studied over Co- Mo/TiO2- ZrO2 and Co-Mo/γ-Al2O3 catalysts. Under the experimental conditions of this study, the surface area, acidity and acid strength of TiO2- ZrO2 support were similar to those of γ-Al2O3 support. Characteristics of Co-Mo/TiO2-ZrO2 catalyst were similar to that of Co-Mo/γ-Al2O3 Catalyst, too. Under the atmospheric pressure, thiophene conversion increased with increasing temperature over both Co-Mo/TiO2-ZrO2 and Co-Mo/γ-Al2O3 catalysts, and the increasing rate of thiophene conversion over Co-Mo/TiO2-ZrO2 catalyst was higher than that of Co-Mo/γ-Al2O3 catalyst with increasing temperature.
CoMo / γ- Al2O3 촉매상에서 VO - TPP 의 수소 첨가 탈금속반응에 관한 연구
심현섭,박해경,고을석,김경림 ( Hyeon Seop Shim,Hea Kyung Park,Eul Suk Ko,Kyung Lim Kim ) 한국공업화학회 1993 공업화학 Vol.4 No.4
CoMo/γ-A1_2O_3 촉매상에서 300∼400℃의 온도와 15-30×10^5 Pa의 압력 그리고 접촉시간 0.008-0.020gcat. hr. /ml feel 범위에서 VO-TPP(VO-tetraphenylporphyrin)의 수소 첨가 탈금속반응에 관하여 연구하였다. VO-TPP의 수소 첨가 탈금속반응에서 pyridine 농도 4mole%까지는 농도가 증가함에 따라 전화율의 감소가 나타났으므로 pyridine은 수소 첨가 탈금속반응을 억제한다. 350℃ 이상의 온도에서는 VO-TPP의 외관상 반응차수가 1차였으며, Arrhenius plot에서 얻은 활성화 에너지는 약 23㎉/mole이었다. Fresh 촉매와 aged 촉매의 pore size distribution과 흡착, 탈착 isotherm으로부터 pore mouth-plugging 현상을 확인할 수 있었다. Hydrodemetallation (HDM) of VO-tetraphenylporphyrin (VO-TPP) was studied over CoMo/γ-Al_2O_3 catalyst at emperatures between 300℃ and 400℃, the total pressure between 15×10^5 and 30×10^5 Pa and the contact times between 0.008 and 0.020gcat. hr./ml feed. HDM of VO-TPP was inhibited by pyridine because the increase of pyridine concentration(up to 4mole%) caused the decrease of HDM conversion. The reaction rate of VO-TPP was found to be apparently 1st order over 350℃ and its activation energy was determined to be about 23㎉/mole by Arrhenius plot. Pore mouth-plugging phenomena were shown by ad/desorption isotherm and pore size distribution of fresh and aged catalysts.
CoMo/γ-Al<sub>2</sub>O<sub>3</sub>촉매상에서 VO-TPP의 수소 첨가 탈금속반응에 관한 연구
심현섭,박해경,고을석,김경림,Shim, Hyeon-Seop,Park, Hea-Kyung,Ko, Eul-Suk,Kim, Kyung-Lim 한국공업화학회 1993 공업화학 Vol.4 No.4
$CoMo/{\gamma}-Al_2O_3$ 촉매상에서 $300{\sim}400^{\circ}C$의 온도와 $15-30{\times}10^5$ Pa의 압력 그리고 접촉시간 0.008-0.020 gcat. hr. /ml feed 범위에서 VO-TPP(VO-tetraphenylporphyrin)의 수소 첨가 탈금속반응에 관하여 연구하였다. VO-TPP의 수소 첨가 탈금속반응에서 pyridine 농도 4mole%까지는 농도가 증가함에 따라 전화율의 감소가 나타났으므로 pyridine은 수소 첨가 탈금속반응을 억제한다. $350^{\circ}C$ 이상의 온도에서는 VO-TPP의 외관상 반응차수가 1차였으며, Arrhenius plot에서 얻은 활성화 에너지는 약 23kcal/mole이었다. Fresh 촉매와 aged 촉매의 pore size distribution과 흡착, 탈착 isotherm으로부터 pore mouth-plugging 현상을 확인할 수 있었다. Hydrodemetallation(HDM) of VO-tetraphenylporphyrin(VO-TPP) was studied over $CoMo/{\gamma}-Al_2O_3$ catalyst at emperatures between $300^{\circ}C$ and $400^{\circ}C$, the total pressure between $15{\times}10^5$ and $30{\times}10^5$ Pa and the contact times between 0.008 and 0.020gcat. hr./ml teed. HDM of VO-TPP was inhibited by pyridine because the increase of pyridine concentration(up to 4mole%) caused the decrease of HDM conversion. The reaction rate of VO-TPP was found to be apparently 1st order over $350^{\circ}C$ and its activation energy was determined to be about 23kca1/mo1e by Arrhenius plot. Pore mouth-plugging phenomena were shown by ad/desorption isotherm and pore size distribution of fresh and aged catalysts.
최영철(Choi, Young-Chul),김양한(Kim, Yang-Hann),고을석(Ko, Eul-seok),박춘수(Park, Choon-Su) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
Hub bearings not only sustain the body of a cat, but permit wheels to rotate freely. Excessive radial or axial load and many other reasons can cause defects to be created and grown in each component. Therefore, nitration and noise from unwanted defects in outer-race, inner-race or ball elements of a Hub bearing are what we want to detect as early as possible. How early we can detect the faults has to do with how the detection algorithm finds the fault information from measured signal. Fortunately, the bearing signal has Periodic impulse train. This information allows us to find the faults regardless how much noise contaminates the signal. This paper shows the basic signal processing idea and experimental results that demonstrate how good the method is.