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Lookup NU author(s): Peter Asiedu-Boateng, Dr Jonathan McDonoughORCiD, Dr Vladimir ZivkovicORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Carbonation–calcination looping using CaO-based natural sorbents such as limestone is a promising technology for the capture of CO2 from fossil fuel-based power plants. In this study, the CO2 capture capacities of Buipe, Oterpkolu, and Nauli limestones from quarries in Ghana were measured in a laboratory-scale micro-fluidized bed reactor through multiple carbonation–calcination cycles. The changes in CO2 capture capacity and conversion with the number of cycles mostly correlated with the changes in the physico-chemical properties: Capture capacity dropped from >60% to <15% after 15 cycles and the surface area dropped to below 5 m2 g−1 from as much as 20 m2 g−1 (for the Oterkpolu). The pore volume of the Nauli limestone was essentially invariant with the number of cycles while it increased for the Buipe limestone, and initially increased and then dropped for the Oterpkolu limestone. This decrease was likely due to sintering and a reduction in the number of micropores. The unusual increase in pore volume after multiple cycles was due to the formation of mesopores with smaller pore diameters.
Author(s): Asiedu-Boateng P, Asiedu NY, Patience GS, McDonough JR, Zivkovic V
Publication type: Article
Publication status: Published
Journal: Catalysts
Year: 2025
Volume: 15
Issue: 8
Online publication date: 22/07/2025
Acceptance date: 18/07/2025
Date deposited: 20/08/2025
ISSN (electronic): 2073-4344
Publisher: MDPI
URL: https://doi.org/10.3390/catal15080697
DOI: 10.3390/catal15080697
Data Access Statement: The original contributions presented in this study are included in the article. Further inquiries can be directed to the corresponding author(s).
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