Calcium looping (CaL) is a CO2 capture technique based on the reversible carbonation/calcination of CaO that is considered promising lớn reduce anthropogenic CO2 emissions. However, the rapid decay of the CO2 uptake of CaO over repeated cycles of carbonation and calcination due lớn sintering limits its implementation at the industrial scale. Thus, the development of material design strategies lớn stabilize the CO2 uptake capacity of CaO is paramount. The addition of alkali metal salts lớn CaO has been proposed as a strategy lớn mitigate the rapid loss of its cyclic CO2 uptake capacity. However, there are conflicting results concerning the effect of the addition of alkali metal carbonates on the structure and CO2 capacity of CaO. In this work, we aim at understanding the effect of the addition of Na2CO3 lớn CaO on the sorbent's structure and its CO2 uptake capacity. We demonstrate that under industrially-relevant conditions the addition of as little as 1 wt% of Na2CO3 reduces severely the CO2 uptake of CaO. Combining TGA, XAS and FIB-SEM analysis allowed us lớn attribute the performance degradation lớn the formation of the double salt Na2Ca(CO3)2 that induces strong sintering leading lớn a significant loss in the sorbent's pore volume. In addition, during the carbonation step the formation of a dense layer of Na2Ca(CO3)2 that covers unreacted CaO prevents its full carbonation lớn CaCO3.
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- Article type
- 19 Aug 2020
- 15 Oct 2020
- First published
- 15 Oct 2020
- This article is Open Access
Phys. Chem. Chem. Phys., 2020,22, 24697-24703
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Na2CO3-modified CaO-based CO2 sorbents: the effects of structure and morphology on CO2 uptake
A. Kurlov, A. M. Kierzkowska, T. Huthwelker, P.. M. Abdala and C. R. Müller, Phys. Chem. Chem. Phys., 2020, 22, 24697 DOI: 10.1039/D0CP04410E
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