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• W3197576932 endingPage "132236" @default.
• W3197576932 startingPage "132236" @default.
• W3197576932 abstract "The reversible CO2 adsorption/desorption by Li4SiO4-based sorbents under high temperature has attracted much attention in recent years due to its potential to capture CO2 with a high capacity and excellent cyclic stability. Implementation of the approach largely depends on the equilibrium between CO2 partial pressure and temperature of the sorbents. However, until now no research has been focused on revealing the experimental equilibrium correlation, despite some work alluding to potential effects by precursors or dopants. In this work, typical Li4SiO4-based sorbents with various silicon precursors, dopants of Ce/Fe/Na/K, and varying K contents were synthesized, and experimentally tested using thermogravimetry (TG) by changing the CO2 partial pressure in the range of 0.05–0.5 atm. Results show that experimental equilibrium temperatures are 30–60 °C higher than theoretical values, and pure silicon precursors and dopants of Ce/Fe impose only marginal effects on the adsorption/desorption equilibrium. Interestingly, equilibrium temperatures of sorbents with the presence of K/Na drop off significantly under 0.5 atm of CO2, and more K-dopant corresponds to a lower turnover temperature. This phenomenon is proposed to be the combined action of Li4SiO4 formation and eutectic materials at 500–750 °C. Finally, a correlation formula is established to describe the CO2 adsorption/desorption equilibrium of Li4SiO4-based sorbents by fitting experimental data according to thermodynamic laws." @default.
• W3197576932 created "2021-09-13" @default.
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• W3197576932 date "2022-02-01" @default.
• W3197576932 modified "2023-10-14" @default.
• W3197576932 title "Adsorption and desorption equilibrium of Li4SiO4-based sorbents for high-temperature CO2 capture" @default.
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• W3197576932 doi "https://doi.org/10.1016/j.cej.2021.132236" @default.
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