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RISS 인기검색어
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- 저자 : 김상채(Sang Chai Kim) (검색결과 59 건)
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R22 ( 디플루오르모노클로로메탄 ) 열분해반응에 의한 테트라플루오르에틸렌의 합성
김상채,김철웅,문상진,소원욱,김수진,이정민 ( Sang Chai Kim,Chul Ung Kim,Sang Jin Moon,Won Wook So,Su Jin Kim,Jung Min Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.6
Pyrolysis of R22 for tetrafluoroethylene was carried out using the conventional atmospheric flow reactor. The range of reaction temperature, residence time and N₂/R22 molar ratio were 665∼770℃, 0.05∼0.6 sec, and 3.0∼7.0, respectively. With increasing reaction temperature and residence time, R22 conversion increased, but selectivity of TFE decreased. The use of diluent(N₂) resulted in enhancing the reactivity, and the degree of mixing R22 with N₂ affected the composition of products clearly. The formation of CF₂ might be suggested as the key reaction for pyrolysis of R22 from kinetics experiment. The following first order equation fitted well with experimental results. kr=-0.5·f_(R22)·X+(1+0.5·f_(R22))ln 1/(1-X) The range of activation energy for the rate constant was obtained between 45.19㎉/㏖ and 49.86㎉/㏖.
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NaCl / ZnO / α- Al2O3 촉매상에서 메탄의 Oxidative Coupling 의 속도론적 고찰
김상채,서호준,선우창신,유의연 ( Sang Chai Kim,Ho Joon Seo,Chang Shin Sunwoo,Eui Yeon Yu ) 한국공업화학회 1992 공업화학 Vol.3 No.2
The kinetics for the oxidative coupling of methane over NaCl(30wt%)/ZnO(60wt%)/α-Al_2O_3 catalyst was investigated, and then the active oxygen species were discussed. The conversion rate of methane was measured at the atmospheric pressure with various combinations of partial pressure of methane and oxygen at temperature range of 650℃∼750℃, at conversions less than with 10%. These rate data were then used to verify the proposed Langmuir-Hinshelwood kinetic equation. The rate limiting step appeared to be the formation of the methyl radicals by the reaction of the adsorbed methane and the adsorbed oxygen, which were adsorbed on the different active sites of the catalyst. The activation energy of the methyl radical formation was estimated to be ca. 39㎉/㏖. From the kinetic studies, the oxygen species responsible for the formation of methyl radicals was proposed to be diatomic oxygen such as O_2^(2-) or O_2^ on the surface.
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김상채,정찬홍,유의연 ( Sang Chai Kim,Chan Hong Jung,Eui Yeon Yu ) 한국공업화학회 1996 공업화학 Vol.7 No.2
Various Cu/SiO₂ catalysts with copper concentration ranging from 0 to 50wt% were prepared by kneading method far the steam reforming of methanol. These catalysts were calcined at temperatures in the range of 400∼900℃ and then reduced in a H₂ atmosphere in the range of 150∼300℃. Steam reforming of methanol was carried out at atmospheric pressure over a temperature range of 200∼400℃, steam/methanol molar ratio of 0.4∼1.6 and W/F of 3∼25g.-cat.hr./㏖. Characterization of the catalysts was studied using IR, BET and XRD. Using copper nitrate as a precursor for catalysts, pH in the preparation of catalysts had a great effect on the catalytic activity, but pH in the preparation of catalysts, calcination temperature, and reducing temperature in H₂ atmosphere had no effect on the product distribution. Optimum copper concentration, calcination temperature and reducing temperature were 40wt%, 700℃ and 300℃, respectively. Reaction temperature for maximum H₂ production was 275℃, and the formation of methane which lowered quantity and quality of H₂ would be inhibited below 275℃. Cu^ο-Cu₂O might be active species in Cu/SiO₂ catalyst.
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NaCl/ZnO/α-Al<sub>2</sub>O<sub>3</sub> 촉매상에서 메탄의 Oxidative Coupling의 속도론적 고찰
김상채,서호준,선우창신,유의연,Kim, Sang-Chai,Seo, Ho-Joon,Sunwoo, Chang-Shin,Yu, Eui-Yeon 한국공업화학회 1992 공업화학 Vol.3 No.2
The kinetics for the oxidative coupling of methane over NaCl(30wt%)/ZnO(60wt%)/${\alpha}-Al_2O_3$ catalyst was investigated, and then the active oxygen species were discussed. The conversion rate of methane was measured at the atmospheric pressure with various combinations of partial pressure of methane and oxygen at temperature range of $650^{\circ}C{\sim}750^{\circ}C$, at conversions less than with 10%. These rate data were then used to verify the proposed Langmuir-Hinshelwood kinetic equation. The rate limiting step appeared to be the formation of the methyl radicals by the reactin of the adsorbed methane and the adsorbed oxygen, which were adsorbed on the different active sites of the catalyst. The activation energy of the methyl radical formation was estimated to be ca. 39 kcal/mol. From the kinetic studies, the oxygen species respolsible for the formation of methyl radicals was proposed to be diatomic oxygen such as $O{_2}{^{2-}}$ or $O_2{^-}$ on the surface.
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