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Self-sustained catalytic combustion of CO enhanced by micro fluidized bed: stability operation, fluidization state and CFD simulation

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Abstract

A micro fluidized bed reactor was used to study the self-sustaining catalytic combustion of carbon monoxide (CO). The Cu1−xCexOy catalyst, as well as the pure CuO and CeO2, are used to investigate the contributing mechanism of different active sites including dispersed CuO and Cu—Ce solid solutions. The ignition temperature (Ti) of CO over these catalysts at a flow rate of 2000 mL/min followed the order: 74 °C (Cu0.5Ce0.5Oy) < 75 °C (Cu0.25Ce0.75Oy) < 84 °C (Cu0.75Ce0.25Oy) < 105 °C (CuO) < 500 °C (CeO2). Furthermore, the lean combustion limits (equivalence ratio ϕ) over these catalysts under the flow rates of 750–3000 mL/min (through fixed, bubbling, and fluidized bed) were also measured, which are Cu0.5Ce0.5Oy < Cu0.25Ce0.75Oy < Cu0.75Ce0.25Oy < CuO < CeO2. The fluidized bed was simulated using the Eulerian two-fluid model (TFM) coupled with a diffusion/kinetic-limited reaction model to evaluate the influence of operation conditions on the self-sustained combustion of CO. The predicted maximum temperature agreed with the experimental measurements, demonstrating the validity of the kinetic model and simulation parameters. The results of catalytic combustion with increasing CO concentrations suggest that the catalytic combustion reaction could co-exist with the flamed combustion. When a high concentration of CO is used, a blue-purple flame caused by CO combustion appears in the upper part of the fluidized bed, indicating that the range of CO-containing exhaust gas purification could be expanded to a larger range using the fluidized-bed catalytic combustion technique.

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Acknowledgements

We gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 52176141).

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Authors and Affiliations

  1. State Key Laboratory of High-Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China

    Zirui Zhang, Chenhang Zhang, Huan Liu, Feng Bin, Xiaolin Wei & Running Kang

  2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, China

    Zirui Zhang

  3. School of Energy and Power Engineering, Dalian University of Technology, Dalian, 116000, China

    Shaohua Wu

  4. Department of Mechanical Engineering, National University of Singapore, Singapore, 117575, Singapore

    Wenming Yang

  5. School of Vehicle and Energy, Yanshan University, Qinhuangdao, 066000, China

    Hongpeng Xu

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  1. Zirui Zhang
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  2. Chenhang Zhang
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  3. Huan Liu
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  4. Feng Bin
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  5. Xiaolin Wei
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  6. Running Kang
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  7. Shaohua Wu
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  8. Wenming Yang
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  9. Hongpeng Xu
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Corresponding authors

Correspondence to Feng Bin, Shaohua Wu or Hongpeng Xu.

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Highlights

• Catalytic combustion in fluidized bed realizes efficient heat and mass transfer.

• Catalytic combustion in fluidized bed reduces the lean combustion limits.

• Catalytic combustion and flame combustion can be coupled.

• The diffusion/kinetics limited reaction model is suitable for catalytic combustion.

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Zhang, Z., Zhang, C., Liu, H. et al. Self-sustained catalytic combustion of CO enhanced by micro fluidized bed: stability operation, fluidization state and CFD simulation. Front. Environ. Sci. Eng. 17, 109 (2023). https://doi.org/10.1007/s11783-023-1709-x

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  • DOI: https://doi.org/10.1007/s11783-023-1709-x

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