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Coal Chemical-Looping with Oxygen Uncoupling (CLOU) Using a Cu-Based Oxygen Carrier Derived from Natural Minerals

Author

Listed:
  • Ping Wang

    (Department of Energy (DOE), National Energy Technology Laboratory (NETL), 626 Cochrans Mill Road, Pittsburgh, PA 15236, USA)

  • Bret Howard

    (Department of Energy (DOE), National Energy Technology Laboratory (NETL), 626 Cochrans Mill Road, Pittsburgh, PA 15236, USA)

  • Nicholas Means

    (Department of Energy (DOE), National Energy Technology Laboratory (NETL), 626 Cochrans Mill Road, Pittsburgh, PA 15236, USA
    Leidos Research Support Team, 626 Cochrans Mill Road, P.O. Box 10940, Pittsburgh, PA 15236-0940, USA)

  • Dushyant Shekhawat

    (DOE, NETL, 3610 Collins Ferry Road, Morgantown, WV 26507, USA)

  • David Berry

    (DOE, NETL, 3610 Collins Ferry Road, Morgantown, WV 26507, USA)

Abstract

Chemical-looping with oxygen uncoupling (CLOU) is considered a promising technology to burn solid fuels with improved CO 2 capture and has the potential to improve fuel conversion and reaction rates. Cu-based oxygen carriers (Cu-OC) are often used in solid fuel CLOU. This study focused on investigating Cu-OC derived from a natural mineral for solid fuel CLOU because of their potentially lower cost compared to synthetic OCs. Reactivity and recyclability of a natural ore-derived Cu-OC on coal char (Powder River Basin sub-bituminous coal) were studied at 900 °C in Ar and air using TGA-QMS and fixed-bed reactor-QMS for five cycles. Cu-OC was prepared by simply heating chalcopyrite in air. Chalcopyrite is one of the principle copper sulfide ores and one of the primary ores for copper. The prepared Cu-OC had primarily CuO and CuFe 2 O 4 (CuOFe 2 O 3 ) as active compounds based on XRD analysis and an oxygen capacity 3.3% from oxygen uncoupling. The carbon conversion efficiency Xc was 0.94 for reduction at a ratio of Cu-OC to char ϕ = 75 and the product gas was primarily CO 2 with trace O 2 . The reactivities and the rates were similar for five redox cycles. These results indicate that the natural ore-derived material with low cost has potential as a competitive oxygen carrier in solid fuel CLOU based on its reactivity in this study.

Suggested Citation

  • Ping Wang & Bret Howard & Nicholas Means & Dushyant Shekhawat & David Berry, 2019. "Coal Chemical-Looping with Oxygen Uncoupling (CLOU) Using a Cu-Based Oxygen Carrier Derived from Natural Minerals," Energies, MDPI, vol. 12(8), pages 1-13, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:8:p:1453-:d:223488
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    References listed on IDEAS

    as
    1. Wang, Kun & Tian, Xin & Zhao, Haibo, 2016. "Sulfur behavior in chemical-looping combustion using a copper ore oxygen carrier," Applied Energy, Elsevier, vol. 166(C), pages 84-95.
    2. Hu, Wenting & Donat, Felix & Scott, S.A. & Dennis, J.S., 2016. "Kinetics of oxygen uncoupling of a copper based oxygen carrier," Applied Energy, Elsevier, vol. 161(C), pages 92-100.
    3. Ping Wang & Nicholas Means & Dushyant Shekhawat & David Berry & Mehrdad Massoudi, 2015. "Chemical-Looping Combustion and Gasification of Coals and Oxygen Carrier Development: A Brief Review," Energies, MDPI, vol. 8(10), pages 1-31, September.
    4. Clayton, Christopher K. & Whitty, Kevin J., 2014. "Measurement and modeling of decomposition kinetics for copper oxide-based chemical looping with oxygen uncoupling," Applied Energy, Elsevier, vol. 116(C), pages 416-423.
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