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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Particle Size and Reaction Temperature Effects on the Hydrolysis Reaction of Zinc in TGA (Thermo Gravimetric Analyzer)

열 중량 분석기에서 zinc 입자 크기와 반응 온도에 따른 물 분해 특성 연구

  • Ahn, Seung-Hyuck (Grad. School of Industrial Chemistry, Chungnam National Univ.) ;
  • Kang, Kyoung-Soo (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Kim, Chang-Hee (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Bae, Ki-Kwang (Hydrogen Energy Research Center, Korea Institute of Energy Research) ;
  • Kim, Young-Ho (Grad. School of Industrial Chemistry, Chungnam National Univ.) ;
  • Park, Chu-Sik (Hydrogen Energy Research Center, Korea Institute of Energy Research)
  • 안승혁 (충남대학교 공업화학과) ;
  • 강경수 (한국 에너지 기술 연구원 수소에너지 연구 센터) ;
  • 김창희 (한국 에너지 기술 연구원 수소에너지 연구 센터) ;
  • 배기광 (한국 에너지 기술 연구원 수소에너지 연구 센터) ;
  • 김영호 (충남대학교 공업화학과) ;
  • 박주식 (한국 에너지 기술 연구원 수소에너지 연구 센터)
  • Published : 2008.08.30
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Abstract

ZnO/Zn redox cycle is the one of the promising thermochemical cycles for hydrogen production via water splitting with high temperature heat source like a concentrated solar energy. This paper reports the particle size effect of Zinc on water splitting behavior. Water splitting reaction experiments were carried out at isothermal conditions of 350 and 400$^{\circ}C$ in TGA (Thermo Gravimetric Analyzer) using four commercial Zinc powders (nano, <10 ${\mu}m$, <150 ${\mu}m$ and $150{\sim}600\;{\mu}m$ particle sizes). Before the experiments, average particle size of Zinc powders was analyzed by PSA (Particle Size Analysis). After the experiments, XRD (X-Ray Diffraction) and SEM (Scanning Electron Microscope) analyses were conducted on the samples. The experimental results showed that particle size had a effect on the conversion of Zinc to ZnO. Zinc conversion was increased, as the particle size decreased. Especially, the nano size particles were aggregated and the particle's morphology changed on the surface during hydrolysis reaction.

Keywords

References

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