How do CaO/CuO materials evolve in integrated calcium and chemical looping cycles?

Zheng, Yaoyao; Scott, Stuart A.

Abstract

Maintaining high CO2 uptake is critical for combined Ca-Cu looping applications, however, the long-term behaviour of combined Ca and Cu materials under repeated cycling conditions remains less understood. This study examined three materials with a fixed Cu/Ca mole ratio of 1.6 to analyse the material phase evolution and identify factors influencing CO2 uptake. The materials underwent 50 TGA cycles in two distinct looping applications: blast furnace gas (BFG) cycling (reduction-carbonation-oxidation) and flue gas cycling (carbonation-reduction-oxidation).
Different preparation methods significantly affected the initial phase distribution. The multi-grain precipitate material (MGP), prepared to minimise the chemical contact between Ca and Cu, primarily contained separate CaO and CuO phases; while the multi-stage mechanically mixed materials (MM1 and MM2), in which there was extensive contact between the Ca and Cu, exhibited mixed Ca-Cu-O phases along with separate CuO. However, the initial phase distribution had little influence on the longer-term CO2 uptake with the accessibility of CaO and cycling conditions having a more significant impact. BFG cycling consistently resulted 70–100; % greater CO2 uptake than flue gas cycling, highlighting the strong influence of cycling conditions.

Citation

Zheng, Y., & Scott, S. A. (2025). How do CaO/CuO materials evolve in integrated calcium and chemical looping cycles?. Carbon Capture Science & Technology, 15, Article 100389. https://doi.org/10.1016/j.ccst.2025.100389

• Journal Article Type: Article
• Acceptance Date: Feb 19, 2025
• Online Publication Date: Feb 19, 2025
• Publication Date: 2025-06
• Deposit Date: Apr 9, 2025
• Publicly Available Date: Apr 9, 2025
• Journal: Carbon Capture Science & Technology
• Electronic ISSN: 2772-6568
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 15
• Article Number: 100389
• DOI: https://doi.org/10.1016/j.ccst.2025.100389
• Keywords: Chemical looping, Calcium looping, Blast furnace gas, Flue gas, CaO/CuO
• Public URL: https://nottingham-repository.worktribe.com/output/45863817
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S2772656825000296?via%3Dihub