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• W2079662841 abstract "This study focuses on the effect of various parameters of the synthesis procedure of the CO2 sorbent—CaO−Ca12Al14O33 derived from calcium acetate—on the CO2 sorption ability and lifetime. The synthesis procedure consists of the calcination of the acetate CaO precursor (step 1), the precipitation of the CaO with aluminum nitrates (step 2), followed by calcination at 500 °C for nitrates removal (step 3) and the calcination at 900 °C for the synthesis of Ca12Al14O33 (step 4). It has been shown, by employing TGA, that the applied difference in the calcination conditions (900 °C/2 h, 850 °C/1 h, 750 °C/0.5 h,) for the decomposition of the CaO acetate precursor (step 1) is not adequate to affect the sorption fixation and stability results. On the other hand calcination history of the precipitate and the addition of water in between the two calcination steps (nitrates removal and Ca12Al14O33 synthesis reaction) are of high importance for ensuring sorption capacities higher than 6.5 mol CO2/kg of sorbent in the first cycle. SEM observations showed that the addition of water after calcination at 500 °C (step 3) accounts for the generation of the regular hexagonal crystalloids of Ca(OH)2 which transforms in a porous network during calcination at 900 °C. It was also demonstrated that the quantity of CO2 molecules retained increases with decreasing aging time of the precipitate as a result of higher surface area (smaller crystal size) of the as-synthesized samples. The sorbent with the lower binder content (CaO/Ca12Al14O33 = 85:15) showed the prospective higher capacity (45% weight increase) in the first cycle but also a fair stability on repetitive sorption−desorption cycles." @default.
• W2079662841 created "2016-06-24" @default.
• W2079662841 creator A5006689971 @default.
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• W2079662841 date "2008-11-05" @default.
• W2079662841 modified "2023-09-30" @default.
• W2079662841 title "Parametric Study of the CaO−Ca₁₂Al₁₄O₃₃ Synthesis with Respect to High CO₂ Sorption Capacity and Stability on Multicycle Operation" @default.
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• W2079662841 doi "https://doi.org/10.1021/ie800882d" @default.
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