Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 24, Pages 4881-4891Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm402875v
Keywords
carbon capture and storage; CO2 absorption; X-ray diffraction; thermogravimetric analysis; perovskite
Funding
- Australian Research Council Discovery Projects [DP110102662]
- Engineering and Physical Sciences Research Council [EP/G063265/1]
- Cambridge Commonwealth Trusts
- Trinity College, Cambridge
- EU ERG
- Engineering and Physical Sciences Research Council [EP/G063265/1] Funding Source: researchfish
- EPSRC [EP/G063265/1] Funding Source: UKRI
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A novel compound for carbon capture and storage (CCS) applications, the 6H perovskite Ba4Sb2O9, was found to be able to absorb CO2 through a chemical reaction at 873 K to form barium carbonate and BaSb2O6. This absorption was shown to be reversible through the regeneration of the original Ba4Sb2O9 material upon heating above 1223 K accompanied by the release of CO2. A combined synchrotron X-ray diffraction, thermogravimetric, and microscopy study was carried out to characterize first the physical absorption properties and then to analyze the structural evolution and formation of phases in situ. Importantly, through subsequent carbonation and regeneration of the material over 100 times, it was shown that the combined absorption and regeneration reactions proceed without any significant reduction in the CO, absorption capacity of the material. After 100 cycles the capacity of Ba4Sb2O9 was similar to 0.1 g (CO2)/g (sorbent), representing 73% of the total molar capacity. This is the first report of a perovskite-type material showing such good properties, opening the way for studies of new classes of inorganic oxide materials with stable and flexible chemical compositions and structures for applications in carbon capture.
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