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

Ping Wang, Bret Howard, Nicholas Means, Dushyant Shekhawat and David Berry
Additional contact information
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
Dushyant Shekhawat: DOE, NETL, 3610 Collins Ferry Road, Morgantown, WV 26507, USA
David Berry: DOE, NETL, 3610 Collins Ferry Road, Morgantown, WV 26507, USA

Energies, 2019, vol. 12, issue 8, 1-13

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 ? = 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.

Keywords: chemical-looping with oxygen uncoupling (CLOU); coal; Cu-based oxygen carrier; reactivity; recyclability; natural minerals; chemical-looping combustion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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