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RISS 인기검색어
- 검색키워드
- 저자 : 남기석 ( Kee Suk Nahm ) (검색결과 53 건)
- 무료
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수소기체에 함유된 O2 CO 및 탄화수소 기체에 의한 LaNi5 의 불활성화 및 재생
남기석,문성식,이화영 ( Kee Suk Nahm,Seong Sik Moon,Wha Young Lee ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.5
The deactivation of LaNi_5 by O₂, CO and hydrocarbon gases contained in hydrogen gas, and the regeneration of the deactivated LaNi_5 were studied. The pressure-concentration-temperature curves for pure and microencapsulated LaNi_5 were shown to be almost the same. In the mixed gases, the hydrogenating reaction rates of microencapsulated LaNi_5 were higher than of pure LaNi_5. Independent of the samples, in the hydrogen gas containing oxygen, the reacted fraction of LaNi_5 maintained constant at nearly 100%. In the hydrogen gas containing carbon monoxide, on the contrary, the reacted fractions decreased with the increase of the reaction cycle although the magnitudes of them were slightly different according to the samples. The deactivated LaNi_5 was regenerated by the formation of CH₄ from the reaction of CO and H₂ at 423 K, and the regenerated LaNi_5 showed a fraction higher than 90%.
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남기석,김윤섭,이화영 ( Kee Suk Nahm,Youn Sop Kim,Wha Young Lee ) 한국공업화학회 1992 공업화학 Vol.3 No.2
The experimental study on the reduction of In_2O_3 was performed by using thermogravimetric analyser. The reduction of In_2O_3 was occurred at above 300℃ , The reduction rates were rapidly increased with the reaction temperature, while hardly affected by the flow rate of hydrogen gas. It was found that the unreacted core model could be applied for the analysis of the reduction data and the rate control step was the chemical reaction of In_2O_3 with hydrogen on the surface of unreacted In_2O_3. The apparent activation energy for this reaction was 20㎉/g-㏖ H_2 and the rate equation of In_2O_3 reduction with hydrogen could be expressed in the folowing equation. dt/dX=1.6×10^5 e^(-20000/RT).(1-X)^(2/3)
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수소에 의한 In<sub>2</sub>O<sub>3</sub>의 환원반응속도론 연구
남기석,김윤섭,이화영,Nahm, Kee-Suk,Kim, Youn-Sop,Lee, Wha-Young 한국공업화학회 1992 공업화학 Vol.3 No.2
The experimental study on the reduction of $In_2O_3$ was performed by using thermogravimetric analyzer. The reduction of $In_2O_3$ was occurred at above $300^{\circ}C$. The reduction rates were rapidly increased with the reaction temperature, whilehardly affectedby the flow rate of hydrogen gas. It was found that the unreacted core model could be applied for the analysis of the reduction data and the rate control step was the chemical reaction of $In_2O_3$ with hydrogen on the surface of unreacted $In_2O_3$. The apparent activation energy for this reaction was 20kcal/g-mol $H_2$ and the rate equation of $In_2O_3$ reduction with hydrogen could be expressed in the following equation. ${\frac{dX}{dt}}=1.6{\times}10^5e^{-20000/RT}(1-X)^{2/3}$
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