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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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High Purity Hydrogen Production by Redox Cycle Operation

산화-환원 싸이클 조업에 의한 고순도 수소생성

  • Jeon, Bup-Ju (Department of Energy Resources, Hanbuk University) ;
  • Park, Ji-Hun (Department of Materials Science & Engineering, Korea University)
  • 전법주 (한북대학교 에너지자원학과) ;
  • 박지훈 (고려대학교 신소재공학과)
  • Received : 2010.07.12
  • Accepted : 2010.10.20
  • Published : 2010.10.31
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Abstract

High purity hydrogen, 97-99 vol.%, with CO at just ppm levels was obtained in a fixed bed of iron oxide employing the steam-iron cycle operation with reduction at 823K and oxidation in a steam-$N_2$ mixture at 773K TGA experiments indicated that temperature of the reduction step as well as its duration are important for preventing carbon build-up in iron and the intrusion of $CO_2$ into the hydrogen product. At a reduction temperature of 823K, oxide reduction by $H_2$ was considerably faster than reduction by CO. If the length of the reduction step exceeds optimal value, low levels of methane gas appeared in the off-gas. Furthermore, with longer durations of the reduction step and CO levels in the reducing gas greater than 10 vol.%, carbidization of the iron and/or carbon deposition in the bed exhibited the increasing pressure drop over the bed, eventually rendering the reactor inoperable. Reduction using a reducing gas containing 10 vol.% CO and a optimal reduction duration gave constant $H_2$ flow rates and off-gas composition over 10 redox reaction cycles.

Keywords

References

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