In:
Physical Chemistry Chemical Physics, Royal Society of Chemistry (RSC), Vol. 23, No. 47 ( 2021), p. 26696-26708
Abstract:
Although Li 4 SiO 4 -based sorbents are candidates for CO 2 capture at high temperatures, it is still necessary to improve their kinetic activation for adsorption and desorption. Carbonate doping to Li 4 SiO 4 is considered as one of the effective means to improve CO 2 capture by Li 4 SiO 4 . In this study, Li 4 SiO 4 was synthesized using Li 2 CO 3 and SiO 2 at 900 °C, and mixed with different amounts of Na 2 CO 3 as CO 2 sorbents. The effects of Na 2 CO 3 on the absorption and desorption were characterized using thermal analyses in an atmosphere of 80 vol% CO 2 –20 vol% N 2 . In situ Raman and XRD were used for the characterization of the structural transformations and phase evolution during the CO 2 capture. The activation energy of both chemisorption and diffusion in adsorption dropped significantly. The additive Na 2 CO 3 can react with CO 2 and produce the pyrocarbonate, which is favorable for CO 2 capture of Li 4 SiO 4 and CO 2 diffusion. The doped Na 2 CO 3 served two functions: producing the intermediate product and forming the melt with the product Li 2 CO 3 to accelerate CO 2 transport. The Na 2 CO 3 -doped Li 4 SiO 4 exhibits stable cyclic durability with conversions of 75% in 20 adsorption–desorption cycles.
Type of Medium:
Online Resource
ISSN:
1463-9076
,
1463-9084
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
1476283-3
detail.hit.zdb_id:
1476244-4
detail.hit.zdb_id:
1460656-2
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