• 제목/요약/키워드: 황-요오드 싸이클

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SI 원자력 수소생산을 위한 $SO_3$ 분해반응촉매에 관한 연구 ($SO_3$ Decomposition Catalysis in SI Cycle to to Produce Hydrogen)

  • 김태호;신채호;주오심;정광덕
    • 한국수소및신에너지학회논문집
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    • 제22권1호
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    • pp.21-28
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    • 2011
  • Fe, Ni and Co, typical active components, were dispersed on $Al_2O_3$ and $TiO_2$ for $SO_3$ decomposition. $SO_3$ decomposition was conducted at the temperature ranges from $750^{\circ}C$ to $950^{\circ}C$ using the prepared catalysts. Alumina based catalysts showed the surface areas higher than Titania based catalysts, which resulted from spinel structure formation of alumina based catalysts. Catalytic $SO_3$ decomposition reaction rates were in the order of Fe>Co${\gg}$Ni. The metal sulfate decomposition temperature were in the order of Ni>Co>Fe from TGA/DTA analysis of metal sulfate. During $SO_3$ decomposition, metal sulfate can form on the catalysts. $SO_2$ and $O_2$ can be produced from the decomposition of metal sulfate. In that point of view, the less is the metal sulfate deomposition temperature, the higher can be the $SO_3$ decomposition activity of the metal component. Therefore, it can be concluded that metal component with the low metal sulfate decomposition temperature is the pre-requisite condition of the catalysts for $SO_3$ decomposition reaction.

물분해 수소제조를 위한 SI cycle에서의 EMIm[$EtSO_4$]를 이용한 $SO_2/O_2$ 분리공정 ($SO_2/O_2$ Separation Process with EMIm[$EtSO_4$] in SI Cycle for the Hydrogen Production by Water Splitting)

  • 이기용;김홍곤;정광덕;김창수
    • 한국수소및신에너지학회논문집
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    • 제22권1호
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    • pp.13-20
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    • 2011
  • $SO_2$ has been absorbed and separated selectively by an ionic liquid from $SO_2/O_2$ mixture decomposed from sulfuric acid during the thermochemical SI cycle for the water splitting. In order to design and operate high pressure $SO_2/O_2$ separation system, the solubility of $SO_2$ in [EMIm]$EtSO_4$ (1-ethyl-3-methylimidazolium ethylsulfate) has been measured by Magnetic Suspension Balance at high pressure and temperature. Based on the measured solubility, a pressurized separation system was set up and operated. 194 L/h of $SO_2$($SO_2:O_2$=0.65:1) has been separated with 99.85% of $O_2$ at the vent of absorption tower, which is 22.7% of the theoretically ideal capacity of the system. This discrepancy results from the reduced contact between the gaseous $SO_2$ and the ionic liquid. Increased $SO_2$ supply, scale-up of the absorption column, and a faster ionic liquid circulation speed were suggested to improve the separation capacity.