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Effect of oxidation states of Mn in Ca1−x Li x MnO3 on chemical-looping combustion reactions

  • Catalysis, Reaction Engineering
  • Published:
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Abstract

We investigated the effect of the oxidation state of Mn in CaMnO3 perovskite particles to improve their oxygen transfer performance for chemical-looping combustion (CLC). Li was introduced in the Ca site of CaMnO3 to increase the Mn oxidation state. Ca1−x Li x MnO3 particles were synthesized by the solid-state method, and the amount of Li added ranged from 0 to 0.015 mol. The structure of the synthesized Ca1−x Li x MnO3 particles was examined using XRD, and all particles were confirmed to have a CaMnO3 perovskite structure. The shape and chemical properties of the prepared particles were characterized by using SEM and CH4-TPD. The binding energy and oxidation state of the different elements in the Ca1−x Li x MnO3 particles were measured by XPS. When Li was added, the oxidation state of Mn in Ca1−x Li x MnO3 was higher than that of Mn in CaMnO3. The oxygen transfer performance of the particles was determined by an isothermal H2-N2/air and CH4-CO2/air redox cycle at 850 °C, repeated ten times, using TGA. All particles showed an oxygen transfer capacity of about 8.0 to 9.0 wt%. Among them, Ca0.99Li0.01MnO3 particles had the best performance and the oxygen transfer capacity under H2-N2/air and CH4-CO2/air atmosphere was 8.47 and 8.75 wt%, respectively.

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Authors and Affiliations

  1. Department of Chemistry, College of Science, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Korea

    Byeong Sub Kwak & Misook Kang

  2. School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk, 38541, Korea

    No-Kuk Park

  3. Korea Electric Power Corporation Research Institute, 105 Munji-ro, Yuseong-gu, Daejeon, 34056, Korea

    Jeom-In Baek

  4. Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Korea

    Ho-Jung Ryu

Authors
  1. Byeong Sub Kwak
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  2. No-Kuk Park
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  3. Jeom-In Baek
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  4. Ho-Jung Ryu
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  5. Misook Kang
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Correspondence to Misook Kang.

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Kwak, B.S., Park, NK., Baek, JI. et al. Effect of oxidation states of Mn in Ca1−x Li x MnO3 on chemical-looping combustion reactions. Korean J. Chem. Eng. 34, 1936–1943 (2017). https://doi.org/10.1007/s11814-017-0107-0

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  • DOI: https://doi.org/10.1007/s11814-017-0107-0

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