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Experimental and Thermodynamic Study on the Interaction of Copper Oxygen Carriers and Alkaline-Containing Salts Commonly Present in Ashes

  • Duygu Yilmaz*
    Duygu Yilmaz
    Chemistry and Chemical Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden
    *Email: [email protected]
    More by Duygu Yilmaz
  • Esraa Darwish
    Esraa Darwish
    Chemistry and Chemical Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden
  • , and 
  • Henrik Leion
    Henrik Leion
    Chemistry and Chemical Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden
    More by Henrik Leion
Cite this: Energy Fuels 2020, 34, 4, 4421–4432
Publication Date (Web):March 9, 2020
https://doi.org/10.1021/acs.energyfuels.0c00229
Copyright © 2020 American Chemical Society

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    Abstract

    As CO2 emission is one of the most critical issues that causes global warming, methods have been developed for carbon capture and storage. Chemical looping combustion (CLC) and chemical looping oxygen uncoupling (CLOU) are unique and useful methods for direct separation of carbon dioxide in combustion. In CLC and CLOU, metal oxides are used as an oxygen carrier to transfer oxygen between an air and a fuel reactor. The fuel is oxidized with the released oxygen by the oxygen carrier used. When coal or any ash-containing fuels are used an interaction between ash-forming matters and oxygen carrier can occur which can cause to deactivation or agglomeration of the oxygen carriers. The composition of species in the ash and their amount can vary widely and also depend on the fuel used. Thermodynamic equilibrium calculations (TEC) can be used to predict the resulting compounds during in CLC and CLOU. This can help choosing the right fuel for the right oxygen carrier or vice versa. In this study, the interaction between common salt-based ash-forming matters present in ash and the widely used CuO oxygen carriers was studied both experimentally and thermodynamically. Experiments were carried out at 900 °C under both oxidizing and inert atmospheres using CuO or Cu2O (CuO/Cu2O) as the oxygen carrier and K- and Na-based carbonate, chloride, nitrate, phosphate, and sulfate to represent salt compounds present in the ashes. To observe the interaction of the oxygen carriers with each salt compound used, equal moles of copper oxide and a salt compound were mixed. In addition to this, the effect of salt compounds used for the interaction between oxygen carrier and a model ash was also investigated. NaSO4 showed the harshest effect among the salts used since it caused a strong agglomeration. Generally, potassium-based salts did not affect the oxygen carriers directly and the results were consistent with the TEC. However, sodium-based salts showed significant effect on the system which differed from the TEC results.

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    Cited By

    This article is cited by 5 publications.

    1. Emil O. Lidman Olsson, Peter Glarborg, Kim Dam-Johansen, Hao Wu. Review of Phosphorus Chemistry in the Thermal Conversion of Biomass: Progress and Perspectives. Energy & Fuels 2023, 37 (10) , 6907-6998. https://doi.org/10.1021/acs.energyfuels.2c04048
    2. Duygu Yilmaz, Britt-Marie Steenari, Henrik Leion. Comparative Study: Impacts of Ca and Mg Salts on Iron Oxygen Carriers in Chemical Looping Combustion of Biomass. ACS Omega 2021, 6 (25) , 16649-16660. https://doi.org/10.1021/acsomega.1c02138
    3. Duygu Yilmaz, Henrik Leion. Interaction of Iron Oxygen Carriers and Alkaline Salts Present in Biomass-Derived Ash. Energy & Fuels 2020, 34 (9) , 11143-11153. https://doi.org/10.1021/acs.energyfuels.0c02109
    4. Jie Yang, Shengyu Liu, Quxiu Dai, Zhiying Guo, Ran Ao, Jinghuan Pan, Yingchun Yang, Yijin Yang, Liping Ma. Regeneration mechanism of CuO-CaSO4 based oxygen carriers. Fuel 2021, 306 , 121668. https://doi.org/10.1016/j.fuel.2021.121668
    5. Tian Ren, Mei An, Xiude Hu, Jingjing Ma, Qingjie Guo. Development of inexpensive perovskite Mn‐based oxygen carriers using the waste manganese sand for chemical looping gasification. International Journal of Energy Research 2021, 45 (2) , 2416-2431. https://doi.org/10.1002/er.5936