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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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Redox Characteristics of $MO/Al_2O_3-ZrO_2$ [M=Ni and Cu] Mixed Metal Oxides

$MO/Al_2O_3-ZrO_2$ [M=Ni 및 Cu] 혼합 금속 산화물의 환원-산화 특성

  • Ryu, Jae-Chun (Department of Fine Chemicals Engineering & Chemistry, Chungnam National University) ;
  • Kim, Young-Ho (Department of Fine Chemicals Engineering & Chemistry, Chungnam National University) ;
  • Park, Chu-Sik (Korea Institute of Energy Research) ;
  • Hwang, Gab-Jin (Korea Institute of Energy Research) ;
  • Kim, Jong-Won (Korea Institute of Energy Research)
  • Published : 2005.03.15
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Abstract

[ $MO/Al_2O_3-ZrO_2$ ](M=Ni and Cu) mixed metal oxides were prepared using sol-gel method in order to investigate the applicability to the 2-step thermo-chemical water splitting process and their redox behaviors were studied by temperature programmed reaction(TPR) from room temperature to 900$^{\circ}C$ under 5% $H_2$/Ar for the reduction and $H_2O$/Ar for the oxidation, respectively. From the results, peaks of the reduction and the oxidation on temperature were shifted with the change of crystalline phases due to the addition of $Al_2O_3$ and $ZrO_2$. The intensities of the peaks were also increased with the increase of contents of NiO or CuO that could be considered as active species. In addition, based on the observation of SEM images before and after the redox test, it seemed that $Al_2O_3-ZrO_2$ added prevented high temperature sintering of active metal components such as Ni (or Cu) on the surface and played a role of dispersing the active species homogeneously in solid solution of mixed oxides.

Keywords

References

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