Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Improved high-performance La0.7Sr0.3MxFe1-xO3 (M = Cu, Cr, Ni) perovskite catalysts for ortho-para hydrogen spin conversion

  • Choi, Jeong-Gil (Department of Chemical Engineering and Advances Materials, Hannam University) ;
  • Choi, Euiji (Applied Chemistry, Department of Materials Science and Engineering, Kyushu University) ;
  • Kweon, Soon-Cheol (Green City Technology Institute, Korea Institute of Science and Technology) ;
  • Oh, In-Hwan (Green City Technology Institute, Korea Institute of Science and Technology)
  • Received : 2017.12.04
  • Accepted : 2017.12.28
  • Published : 2018.02.28
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Abstract

The improved high-performance Fe-based perovskite-type oxides ($La_{0.7}Sr_{0.3}M_xFe_{1-x}O_3$, M = Cu, Cr, Ni) were synthesized by a citrate method and characterized by SEM, EDS, XRD and NMR spectroscopy analyses. The characterization analyses revealed that the stoichiometric amounts of lattice oxygen were existed in all of perovskite samples except for a nickel-doped perovskite. Fe-based perovskites exhibited a surprising result for ortho-para $H_2$ spin conversion reaction, indicating two orders of magnitude higher conversions and conversion rates than commercial $Fe_2O_3$. It was considered that this conversion difference might be attributed to the presence of oxygen vacancies in Fe-based perovskites prepared in this study.

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References

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