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Effect of Sodium Bromide on CaO-Based Sorbents Derived from Three Kinds of Sources for CO 2 Capture.
- Source :
-
ACS omega [ACS Omega] 2020 Jul 17; Vol. 5 (29), pp. 17908-17917. Date of Electronic Publication: 2020 Jul 17 (Print Publication: 2020). - Publication Year :
- 2020
-
Abstract
- The calcium looping (CaL), which applies carbonation/calcination cyclic reactions of a CaO sorbent, has received extensive attention for postcombustion CO <subscript>2</subscript> capture. However, as the number of cyclic reactions increased, the capture efficiency of regenerated CaO decreased rapidly. Sodium doping was proposed for modification of a CaO sorbent, but there was little research on whether sodium doping had a good effect on different kinds of sorbents. In this paper, three different kinds of calcium-based sorbents, i.e., CaCO <subscript>3</subscript> , dolomite, and SG-CaO, were modified by NaBr to explore the effect of sodium on CO <subscript>2</subscript> capture performance. The results showed that the modification effects of sodium on three kinds of precursors were different. For CaCO <subscript>3</subscript> , the modification effect of sodium doping was the best. After 50 cycles, the sorption capacity of CaO/NaBr was over 3.5 times that of an unmodified sorbent; for dolomite, sodium had a moderate effect during initial cycles and then showed obvious improvement in the stability of the sorbent, the sorption capacity of the modified dolomite increased by over 30% after 50 cycles; for the SG-CaO, sodium had a negative effect, the sorption capacity of the modified sorbent decreased by about 30% after 50 cycles. When the atmosphere contained SO <subscript>2</subscript> , the doping of an alkali metal also showed a certain effect.<br />Competing Interests: The authors declare no competing financial interest.<br /> (Copyright © 2020 American Chemical Society.)
Details
- Language :
- English
- ISSN :
- 2470-1343
- Volume :
- 5
- Issue :
- 29
- Database :
- MEDLINE
- Journal :
- ACS omega
- Publication Type :
- Academic Journal
- Accession number :
- 32743162
- Full Text :
- https://doi.org/10.1021/acsomega.0c00219