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Chemical looping with oxygen uncoupling of municipal solid waste with Cu-Ca composite oxygen carriers

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  • Lin, Yousheng
  • Lu, Zhihan
  • Ge, Ya
  • Xiao, Hanmin
  • Yang, Xiaoping
  • He, Qing

Abstract

To investigate the effects of Ca-doping on the characterization and thermal behavior of chemical looping with oxygen uncoupling (CLOU) of municipal solid waste (MSW), three Cu-Ca composite oxygen carriers (OCs) were prepared using mechanical mixing and self-assembly template synthesis (SATS). XRD results showed that the crystal phases and chemical state of CuO reverted to their initial state after redox cycles. H2 temperature-programmed reduction and thermogravimetric analysis indicated that 7.5 % Ca-doping enhanced reactivity and oxygen decoupling rate, with CuO@CaO/ZrO2-DW achieving the highest decoupling rate of −2.08 %/min. Catalytic activity was observed between 330 °C and 400 °C, while combustion enhancement was noted at 950 °C. 1:30 MSW-to-OC ratio was the most appropriate. The Cu-Ca composite OCs prepared by the SATS method exhibited excellent dispersion, and Ca doping alleviated Cu/CuO enrichment on the particle surface without significant agglomeration during 10 redox cycles. Kinetic analysis indicated that the chemical order model effectively describes the first stage, while the geometrical contraction model fits the second stage, with activation energies of 55.63–92.08 kJ/mol and 247.83–321.77 kJ/mol, respectively. These findings demonstrate that Cu-Ca composite OCs are excellent and stable candidates for CLOU applications.

Suggested Citation

  • Lin, Yousheng & Lu, Zhihan & Ge, Ya & Xiao, Hanmin & Yang, Xiaoping & He, Qing, 2025. "Chemical looping with oxygen uncoupling of municipal solid waste with Cu-Ca composite oxygen carriers," Energy, Elsevier, vol. 324(C).
    • Handle: RePEc:eee:energy:v:324:y:2025:i:c:s0360544225017141
    DOI: 10.1016/j.energy.2025.136072
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    References listed on IDEAS

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    1. Lin, Yousheng & Hu, Zhifeng & Ge, Ya & Xiao, Hanmin & Zhang, Gang & He, Qing, 2023. "Chemical looping with oxygen uncoupling of biomass-derived hydrochar with Cu-based oxygen carriers modified by alkaline earth metals," Energy, Elsevier, vol. 280(C).
    2. Wang, Haiming & Liu, Guicai & Veksha, Andrei & Giannis, Apostolos & Lim, Teik-Thye & Lisak, Grzegorz, 2021. "Effective H2S control during chemical looping combustion by iron ore modified with alkaline earth metal oxides," Energy, Elsevier, vol. 218(C).
    3. Zhang, Xuefei & Li, Yongling & Zhang, Xianwen & Ma, Peiyong & Xing, Xianjun, 2023. "Co-combustion of municipal solid waste and hydrochars under non-isothermal conditions: Thermal behaviors, gaseous emissions and kinetic analyses by TGA–FTIR," Energy, Elsevier, vol. 265(C).
    4. Kuang, Cao & Wang, Shuzhong & Luo, Ming & Cai, Jianjun & Zhao, Jun, 2020. "Investigation of CuO-based oxygen carriers modified by three different ores in chemical looping combustion with solid fuels," Renewable Energy, Elsevier, vol. 154(C), pages 937-948.
    5. Lai, ZhiYi & Ma, XiaoQian & Tang, YuTing & Lin, Hai, 2011. "A study on municipal solid waste (MSW) combustion in N2/O2 and CO2/O2 atmosphere from the perspective of TGA," Energy, Elsevier, vol. 36(2), pages 819-824.
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