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Use of a high-entropy oxide as an oxygen carrier for chemical looping

Author

Listed:
  • Adánez-Rubio, Iñaki
  • Izquierdo, María T.
  • Brorsson, Joakim
  • Mei, Daofeng
  • Mattisson, Tobias
  • Adánez, Juan

Abstract

One mixed oxide with 5 cations in equimolar proportions in the sublattice, to fulfil high-entropy oxide (HEO) criteria, has been developed and investigated as oxygen carrier for chemical looping combustion processes. As far as we know, nobody has explored this class of material for chemical looping combustion. Material is prepared by direct mixing of five metal oxides (CuO, Mn2O3, Fe2O3, TiO2, MgO), followed by calcination at 1000, 1100 and 1200 °C for 6 h in air. XRD characterization provides strong evidence that the synthesized oxygen carriers possess the hallmark properties of HEO, and SEM-EDX analysis shows an overall homogeneous metal distribution. Materials have one main cubic phase with the empirical formula MnCuMgFeTiO7, dominating under all conditions. One of the key objectives of this study is achieved, reduce chemical stress during redox cycles. Oxygen transfer capability is investigated by thermogravimetric analysis and batch fluidized bed reactor experiments for different fuels and atmospheres. Mass-based oxygen transport capacities for lattice oxygen and oxygen uncoupling are around 5.5 wt% and 1.1 wt%, respectively. This work opens up a new dimension for the future preparation of oxygen carriers for chemical looping processes, since the vast compositional space of HEO provides opportunities to tune both chemical and physical characteristics.

Suggested Citation

  • Adánez-Rubio, Iñaki & Izquierdo, María T. & Brorsson, Joakim & Mei, Daofeng & Mattisson, Tobias & Adánez, Juan, 2024. "Use of a high-entropy oxide as an oxygen carrier for chemical looping," Energy, Elsevier, vol. 298(C).
    • Handle: RePEc:eee:energy:v:298:y:2024:i:c:s0360544224010806
    DOI: 10.1016/j.energy.2024.131307
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    References listed on IDEAS

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    3. Cabello, Arturo & Abad, Alberto & Gayán, Pilar & García-Labiano, Francisco & de Diego, Luis F. & Adánez, Juan, 2021. "Increasing energy efficiency in chemical looping combustion of methane by in-situ activation of perovskite-based oxygen carriers," Applied Energy, Elsevier, vol. 287(C).
    4. Abhishek Sarkar & Leonardo Velasco & Di Wang & Qingsong Wang & Gopichand Talasila & Lea de Biasi & Christian Kübel & Torsten Brezesinski & Subramshu S. Bhattacharya & Horst Hahn & Ben Breitung, 2018. "High entropy oxides for reversible energy storage," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
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