Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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The Study of the Hydrogen Absorption and Desorption Reactions of Mg under Near Constant Pressure Using the Sievert's Type Automatic Apparatus

부피법 자동장치를 이용한 유사 일정 압력에서 Mg의 수소 흡수 및 방출 반응에 대한 연구

  • 한정섭 (동아대학교 신소재화학공학부 신소재공학과) ;
  • 김선중 (미래에스아이(주))
  • Received : 2019.01.16
  • Accepted : 2019.02.28
  • Published : 2019.02.28
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Abstract

In order to apply the Sievert's type automatic apparatus to thermal analysis of hydrogen absorbing materials, the Sievert's type automatic apparatus was modified in my laboratory. In this study, an experiment was conducted to see if hydrogen absorption and desorption reactions are possible under near constant pressure (${\pm}0.05atm$) using this device. The hydrogenation and dehydrogenation of the Mg-H system was investigated. And the program was also modified for the kinetics. It was found that it is possible to measure the hydrogen absorption rate under near constant pressure of Mg by using the modified Sievert's type automatic apparatus at 573 K and 598 K. And using this system, the hydrogen desorption rate of Mg hydride under near constant pressure at 623 K was also measurable. However, since the hydrogen desorption rate of Mg hydride is fast at 648 K, the hydrogen desorption reaction did not proceed within a constant pressure range of $0.15{\pm}0.05atm$.

Keywords

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Fig. 1. Schematic diagram of automatic experiment apparatus (a) and pressure change behaviors during the reaction of absorption (b) and during the reaction of desorption (c)

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Fig. 2. Example of a setup screen for entering hydrogen ab-sorption and release conditions

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Fig. 6. Pressure changes of hydrogen with time at different temperatures during hydrogen desorption reaction of Mg

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Fig. 7. Shape of Fig. 4 enlarged in a specific time zone, (a) 0to 30 , (b) 30 to 60, (c) 60 to 100 minutes

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Fig. 8. Hydrogen desorption behaviors of Mg at a temper-ature 623 K and 648 K under near constant pressure

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Fig. 3. Pressure changes of hydrogen with time at different temperatures during hydrogen absorption reaction of Mg

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Fig. 4. Shape of Fig. 3 enlarged in a specific time zone, (a) 1 to 5, (b) 20 to 30, (c) 70 to 100 minutes

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Fig. 5. Hydrogen absorption behaviors of Mg at a temperature 573 K and 598 K under near constant pressure

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