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CO2 capture
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DOI：10.1016/j.seppur.2024.128980.png)
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Abstract
En 中文
Microtubule-structured, Mn/Fe binary-doped dolomite-derived sorbents were synthesized by impregnated layer combustion synthesis method for direct solar-driven calcium looping system. The temperatures at which combustion occurs-specifically, 600, 700, 800, and 900 degrees C-as well as the modes used for impregnation, namely the wet and dry impregnated layer combustion synthesis methods, have a significant impact on both the CO2 2 capture performance and the optical absorbance of the sorbent. Overall, the cyclic CO2 2 capture performance of the microtubule-structured sorbents has been significantly enhanced, with a mere loss of 0.10 % to 0.32 % in CO2 2 capture capacity after 20 cycles, attributed to the distinctive porous structure of the absorbent paper. Moreover, the combustion synthesis temperature exceeds a certain threshold, it will compromise the integrity of the hollow microstructure of the sorbent, and 800 degrees C is the desirable synthesis combustion temperature. The average solar absorbance of the sorbent significantly improves under various impregnation modes at 800 degrees C, reaching 66 % to 69 %. This enhancement is attributed to the formation of Ca2Fe2O5 2 Fe 2 O 5 and Ca2MnO4, 2 MnO 4 , along with the decomposition of CaCO3. 3 . It's noteworthy that the citric acid complexed microtubule-structured, dolomite-derived sorbent exhibits the highest and most consistent CO2 2 capture capacity, retaining 93.5 % of its initial CO2 2 capture capacity (0.243 g/g) by the 20th cycle. It alongside possesses the highest average solar absorbance of 69 %, underscoring the efficacy of citric acid complexes in achieving atomic-level uniformity.
Keywords:
CO2 capture
Direct solar-driven calcium looping
Impregnation combustion synthesis
Combustion temperature
Journal
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9
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2.9W
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12.1W