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Zn_xFe_(3-χ)O_(4-δ)를 이용한 이산화탄소의 분해
양천모(Chun Mo Yang),조영구(Young Koo Cho),임병오(Byung O Rim) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.1
Zn_χFe_(3-χ)O_4(0.003<X<0.08) was synthesized by air oxidation method for the decomposition of carbon dioxide. We investigated the characteristics of catalyst, the form of methane by gas chromatograph after decomposition of carbon dioxide and kinetic parameter. Zn_χFe_(3-χ)O_4(0.003<X<0.08) was spinel type structure. The surface areas of catalysts(Zn_χFe_(3-χ)O_4(0.003<X<0.08)) were 15~27 ㎡/g. The shape of Zn_0.003Fe_2.997O_4 was sphere. The optimum temperature for the decomposition of carbon dioxide into carbon was 350℃. Zn_0.003Fe_2.997O_4 showed the 85% decomposition rate of carbon dioxide and the degree of reduction by hydrogen(δ) of Zn_0.003Fe_2.997O_4 was 0.32. At 350℃, the reaction rate constant and activation energy of Zn_0.003Fe_2.997O_3.68 for the decomposition of carbon dioxide into carbon were 3.10 psi^(1-α)/min and 0.98 kcal/mole respectively. After the carbon dioxide was decomposed, the carbon which was absorbed on the catalyst surface was reacted with hydrogen and it became methane.
양천모(Chun Mo Yang),조영구(Young Koo Cho),임병오(Byung O Rim) 한국유화학회 2000 한국응용과학기술학회지 Vol.17 No.1
N/A Zn_χFe_(3-χ)O_4(0.003<X<0.08) was synthesized by air oxidation method for the decomposition of carbon dioxide. We investigated the characteristics of catalyst, the form of methane by gas chromatograph after decomposition of carbon dioxide and kinetic parameter. Zn_χFe_(3-χ)O_4(0.003<X<0.08) was spinel type structure. The surface areas of catalysts(Zn_χFe_(3-χ)O_4(0.003<X<0.08)) were 15~27 m^2/g. The shape of Zn_0.003Fe_2.997O_4 was sphere. The optimum temperature for the decomposition of carbon dioxide into carbon was 350℃. Zn_0.003Fe_2.997O_4 showed the 85% decomposition rate of carbon dioxide and the degree of reduction by hydrogen(δ) of Zn_0.003Fe_2.997O_4 was 0.32. At 350℃, the reaction rate constant and activation energy of Zn_0.003Fe_2.997O_3.68 for the decomposition of carbon dioxide into carbon were 3.10 psi^(??-??)/min and 0.98 kcal/mole respectively. After the carbon dioxide was decomposed, the carbon which was absorbed on the catalyst surface was reacted with hydrogen and it became methane.
$LaCoC_3$ 산화물의 에탄올 감지특성에 미치는 CaO의 영향
임병오,손태원,양천회,Rim, Byung-O,Shon, Tai-Won,Yang, Chun-Hoi 한국안전학회 1988 한국안전학회지 Vol.3 No.2
The perovskite-type compounds $La_{1-x}Ca_xCoO_3$ were synthesized, their thermochemical properties and the gaseous sensitivity were investigated in ethanol vapor. The maximum response for detecting gas corresponded with the exothermic peak of DTA experiment. In any case the substituent was increased, the responsive ratio for detecting gas was grown upon. However, the needed time for response was later, and the operating temperature was elevated. The mechanism of this electrical conductivity was explained by the oxygen ionic diffusion through oxygen vacancy produced by the substituent.
스피넬상 Fe₃O₄를 이용한 CO₂ 분해에서 LiMn₂O₄ 첨가효과
양천모(Chun Mo Yang),박영구(Young Goo Park),조영구(Young Koo Cho),임병오(Byung O Rim) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.3
The spinel Fe₃O₄ powders were synthesized using 0.2 M-FeSO₄·7H₂O and 0.5 M-NaOH by oxidation in air and the spinel LiMn₂O₄ powders were synthesized at 480℃ for 12 h in air by a sol-gel method using manganese acetate and lithium hydroxide as starting materials. The synthesized LiMn₂O₄ powders were mixed at portion of 5, 10, 15 and 20 wt% of Fe₃O₄ powders using a ball-mill. The mixed catalysts were dried at room temperature for 24 hrs. The mixed catalysts were reduced by hydrogen gas at 350℃ for 2 h. The carbon dioxide decomposition rates of the mixed catalysts were 90% in all the mixed catalysts but the decomposition rate of carbon dioxide was increased with adding LiMn₂O₄ powders to Fe₃O₄ powders.
스피넬상 Fe3O4 를 이용한 CO2 분해에서 LiMn2O4 첨가효과
양천모(Chun Mo Yang),박영구(Young Goo Park),조영구(Young Koo Cho),임병오(Byung O Rim) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.3
N/A The spinel Fe_3O_4 powders were synthesized using 0.2 M-FeSO_4·7H_2O and 0.5 M-NaOH by oxidation in air and the spinel LiMn_2O_4 powders were synthesized at 480℃ for 12 h in air by a sol-gel method using manganese acetate and lithium hydroxide as starting materials. The synthesized LiMn_2O_4 powders were mixed at portion of 5, 10, 15 and 20 wt% of Fe_3O_4 powders using a ball-mill. The mixed catalysts were dried at room temperature for 24 hrs. The mixed catalysts were reduced by hydrogen gas at 350℃ for 2 h. The carbon dioxide decomposition rates of the mixed catalysts were 90% in all the mixed catalysts but the decomposition rate of carbon dioxide was increased with adding LiMn_2O_4 powders to Fe_3O_4 powders.
스피넬상 $Li{Mn_2}{O_4}$를 이용한 $CO_2$ 분해의 최적조건
이동석,임병오,양천회,이풍헌,Lee, Dong-Suek,Rim, Byung-O,Yang, Chun-Hoe,Lee, Poong-Hun 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.10
이산화탄소 분해를 위한 촉매 $Li{Mn_2}{O_4}$는 졸-겔법에 의해서 망간아세테이트와 수산화리튬을 출발물질로 사용하여 $150^{\circ}C$의 공기분위기에서 12시간 동안의 건조과정과 $480^{\circ}C$에서 12시간 동안의 열처리과정을 통해서 합성하였다. 합성한 촉매를 수소환원시키기 위해서 다른 온도에서 수소($H_2$)로 3시간동안 환원하였고, 이 수소에 의해 환원된 촉매를 이용해 $300^{\circ}C$, $325^{\circ}C$, $350^{\circ}C$, $375^{\circ}C$, $400^{\circ}C$에서 이산화탄소($CO_2$) 분해율을 조사하였다. 실험결과 수소환원과 이산화탄소 분해의 온도최적조건은 $350^{\circ}C$임을 알 수 있었다. 합성촉매를 포함해 수소에 의한 환원과 이산화탄소분해 후 촉매에 대하여 XRD분석, SEM관찰, TGA 분석을 하였다. The spinel $Li{Mn_2}{O_4}$ catalysts for $CO_2$ decomposition were synthesized by a sol-gel method using manganese acetate and lithium hydroxide as starting materials through drying at $150^{\circ}C$ for 12 hrs under oxygen atmosphere followed by heat treatment at $480^{\circ}C$ for 12 hrs. The synthesized $Li{Mn_2}{O_4}$ were reduced by hydrogen for 3 hrs at various temperatures and the decomposition rate of carbon dioxide was investigated at 300, 325, 350, 375 and $400^{\circ}C$ using the $Li{Mn_2}{O_4}$ reduced by hydrogen gases. As a result of experiment, the optimum temperature of hydrogen reduction and $CO_2$ decomposition was shown $350^{\circ}C$. The physicochemical properties of the spinel $Li{Mn_2}{O_4}$ the reduced $Li{Mn_2}{O_4}$ and the $Li{Mn_2}{O_4}$ after $CO_2$ decomposition were examined with XRD, SEM and TGA.
CO2 분해용 스피넬상 LiMn2O4 에 대한 Fe3O4 첨가효과
양천모(Chun Mo Yang),임병오(Byung O Rim),김승호(Seung Ho Kim),김순태(Soon Tae Kim) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.3
N/A The spinel LiMn_2O_4 powders were synthesized at 480℃ for 12 h in air by a sol-gel method using managanese acetate and lithium hydroxide as starting material and the Fe_3O_4 powders were synthesized by the precipitation method using 0.2M-FeSO_4·H_2O and 0.5M-NaOH. The synthesized Fe_3O_4 powders were mixed at portion of 5, 10, 15 and 20 wt% about LiMn_2O_4 powders through ball-milling followed by drying at room temperature for 48 h in air. The mixed catalysts were reduced at 350℃ for 3 h by hydrogen and the decomposition rate of carbon dioxide was measured at 350℃ using the reduced catalysts. As the results of CO_2 decomposition experiments, the decomposition rates of carbon dioxide were 85% in all catalysts but the initial decomposition rates of CO_2 were slightly high in the case of the 5%-Fe_3O_4 added catalyst.
CO₂ 분해용 스피넬상 LiMn₂O₄ 에 대한 Fe₃O₄ 첨가효과
양천모(Chun Mo Yang),임병오(Byung O Rim),김승호(Seung Ho Kim),김순태(Soon Tae Kim) 한국유화학회 2001 한국응용과학기술학회지 Vol.18 No.3
The spinel LiMn₂O₄ powders were synthesized at 480℃ for 12 h in air by a sol-gel method using managanese acetate and lithium hydroxide as starting material and the Fe₃O₄ powders were synthesized by the precipitation method using 0.2M-FeSO₄·H₂O and 0.5M-NaOH. The synthesized Fe₃O₄ powders were mixed at portion of 5, 10, 15 and 20 wt% about LiMn₂O₄ powders through ball-milling followed by drying at room temperature for 48 h in air. The mixed catalysts were reduced at 350℃ for 3 h by hydrogen and the decomposition rate of carbon dioxide was measured at 350℃ using the reduced catalysts. As the results of CO₂ decomposition experiments, the decomposition rates of carbon dioxide were 85% in all catalysts but the initial decomposition rates of CO₂ were slightly high in the case of the 5%-Fe₃O₄ added catalyst.
CuO-Magnetite 및 ZnO-Magnetite 촉매상에서 $CO_2$ 수식 이미지 분해반응속도론
양천모(Yang, Chun-Mo),임병오(Rim, Byung-O) 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.4
$Cu_xFe_{3-x}O_4$ 수식 이미지 catalyst and $Zn_xFe_{3-x}O_4$ 수식 이미지 catalyst were synthesized by the air oxidation method with various C(II) and Zn(II) weights. Activated catalysts decomposed carbon dioxide to carbon at $350^{\circ}C$ 수식 이미지, $380^{\circ}C$ 수식 이미지, $410^{\circ}C$ 수식 이미지 and $440^{\circ}C$ 수식 이미지. The value of carbon dioxide decomposition rate for $Cu_{0.003}Fe_{2.997}O_4$ 수식 이미지 and $Zn_{0.003}Fe_{2.997}O_4$ 수식 이미지 catslysts than was better catalysts. The decomposed rate of the catalysts is about 85%${\sim}$ 수식 이미지90%. The reaction rate constant(4.00 $psi^{1-{\alpha}}/min$ 수식 이미지) and activation energy(2.62 kcal/mole) of $Cu_{0.003}Fe_{2.997}O_4$ 수식 이미지 catalyst are better than $Zn_{0.003}Fe_{2.997}O_4$ 수식 이미지
기능성 유기 초박막을 이용한 NO2 가스센서 개발을 위한 기초 연구
손병청,임병오,김용인,손태원,신동명,주재백,정귀영,김영관,강우형,이병호 ( B . C . Sohn,B . O . Rim,Y . I . Kim,T . W . Sohn,D . M . Shin,J . B . Ju,G . Y . Chung,Y . K . Kim,W . H . Kang,B . H . Lee ) 한국유화학회 1995 한국응용과학기술학회지 Vol.12 No.1
Ultra thin films of Tetra-3-hexadecylsulphamoylcopperphthalocyanine(HDSM-CuPc) were formed on various substrates by Langmuir-Blodgett method, where HDSM-CuPc was synthesized by attaching long-chain alkylamine(hexa-decylamine) to CuPc. The reaction product was identified with FT-IR, UV-visible absorption spectroscopies, elemental analysis and thin layer chromatography. The formation of Ultrathin Langmuir-Blodgett(LB) films of HDSM-CuPc was confirmed by FT-IR and UV-visible spectroscopies. A quartz piezoelectric crystal coated with LB films of HDSM-CuPc was examined as a gas sensor for NO_2 gas. HDSM-CuPc LB films were transferred to a quartz crystal microbalance(QCM) in the form of Z-type multilayers. Response characteristics of film-coated QCM to NO_2 gas concentrations over a range of 100~600ppm have been tested with a thickness of 5~20 layers of HDSM-CuPc. Changes in frequency by the response time was slow.