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• W2796000873 abstract "To decrease the sintering deterioration of CaO sorbents in multiple CO2 capture and release cycles, we synthesized a series of stabilized CaO sorbents incorporated with silica through freeze-drying and heat-drying, the latter of which was referred to as benchmark. The ratio of Ca and Si precursors was varied to control the reactive loadings of CaO (from 70 to 100 wt %) and the fraction of spacers in the sorbents. The characterization results show that the freeze-drying method produces sorbents with higher specific area and larger pore volume than the heat-drying method. Moreover, the stability test of over 30 cycles demonstrated that the freeze-dried samples exhibited better performance with higher stability and total CO2 uptake. The high-resolution transmission electron microscopy image shows that Ca2SiO4 crystallites as spacers are distributed within the matrix of CaO crystallites. The optimal spacer loading was determined to be ∼10 wt %, and the optimal reaction temperature was found to be 700 °C. Finally, the best sorbent was tested under harsh conditions and maintained a stable capture capacity with a CO2 uptake of 0.21 g of CO2 g–1 of sorbent even at the 30th cycle. The performance of the sorbent in this work was then systematically compared to those reported in the literature. The use of a Si-based spacer and freeze-drying have significant potential to enhance the stability of CaO sorbents." @default.
• W2796000873 created "2018-04-13" @default.
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• W2796000873 date "2018-04-03" @default.
• W2796000873 modified "2023-10-06" @default.
• W2796000873 title "Demonstration of Polymorphic Spacing Strategy against Sintering: Synthesis of Stabilized Calcium Looping Absorbents for High-Temperature CO₂ Sorption" @default.
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• W2796000873 doi "https://doi.org/10.1021/acs.energyfuels.8b00648" @default.
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