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Mechanism of lattice oxygen migration in decarburized Fe-based oxygen carriers to chemical looping gasification

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  • Liang, Shuang
  • Liao, Yanfen
  • Zhang, Tongyu
  • Yang, Hailong
  • Wang, Tingwei

Abstract

In chemical looping cycling, Fe-based oxygen carriers often suffer from agglomeration and phase separation. This study addresses these issues by developing a decarbonized Fe-based oxygen carrier with NiFe2O4 as the active site, CaO as the decarbonizer, and La2O3 as the stabilizer to enhance structural stability. The improvements are achieved through two mechanisms: restricting the thermal movement of the active site and facilitating lattice oxygen migration. Density functional theory calculations suggest that both CaO and La2O3 promote the detachment of lattice oxygen from NiFe2O4. Experimental results demonstrate that the NF@CaLa carrier exhibits a total gas production of 857.4 ml/g at 650 °C with a hydrogen selectivity of 50 %, while maintaining stable performance over 50 cycles. The decarbonized Fe-based oxygen carrier modulates the size and morphology of the active nanoparticles through interactions among the active sites, decarbonizer, and stabilizer, which enhances the size effect. Furthermore, the incorporation of CaO shifts the reaction equilibrium, further improving reactivity. The stabilizer, La2O3, ensures the structural integrity of the oxygen carrier throughout the cycling process.

Suggested Citation

  • Liang, Shuang & Liao, Yanfen & Zhang, Tongyu & Yang, Hailong & Wang, Tingwei, 2024. "Mechanism of lattice oxygen migration in decarburized Fe-based oxygen carriers to chemical looping gasification," Renewable Energy, Elsevier, vol. 236(C).
    • Handle: RePEc:eee:renene:v:236:y:2024:i:c:s0960148124015246
    DOI: 10.1016/j.renene.2024.121456
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    References listed on IDEAS

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