Abstract
The search for cheap solutions for carbon dioxide capture in order to prevent global warming is still challenging. Calcium oxide may be a suitable sorbent, but the regeneration process from calcium carbonate requires too high temperatures, causing sintering and decreasing sorption capacity. In this study the effect of steam on the decomposition of the carbonate is investigated. A clear rate-enhancing effect up to a factor of 4 is observed when steam concentrations up to 1.25% are applied during isothermal reactions at temperatures between 590 and 650°C. This results in a decrease of the apparent activation barrier from 201 to 140kJmol-1, caused by the opening of a new reaction pathway. The kinetics of steam catalyzed decomposition of CaCO3 is discussed and a simple reaction scheme is proposed, including estimation of kinetic constants. The new pathway proceeds via formation of a stable surface bicarbonate followed by decomposition to surface OH groups, which then decompose by desorbing H2O.
| Original language | English |
|---|---|
| Pages (from-to) | 341-356 |
| Number of pages | 16 |
| Journal | Journal of CO2 Utilization |
| Volume | 33 |
| Early online date | 4 Jul 2019 |
| DOIs | |
| Publication status | Published - 1 Oct 2019 |
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Keywords
- Calcium carbonate
- Carbon capture and storage
- Catalytic effect of water
- Decomposition reaction
- Greenhouse gases
Cite this
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Catalytic effect of water on calcium carbonate decomposition. / Giammaria, Guido; Lefferts, Leon.
In: Journal of CO2 Utilization, Vol. 33, 01.10.2019, p. 341-356.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Catalytic effect of water on calcium carbonate decomposition
AU - Giammaria, Guido
AU - Lefferts, Leon
PY - 2019/10/1
Y1 - 2019/10/1
N2 - The search for cheap solutions for carbon dioxide capture in order to prevent global warming is still challenging. Calcium oxide may be a suitable sorbent, but the regeneration process from calcium carbonate requires too high temperatures, causing sintering and decreasing sorption capacity. In this study the effect of steam on the decomposition of the carbonate is investigated. A clear rate-enhancing effect up to a factor of 4 is observed when steam concentrations up to 1.25% are applied during isothermal reactions at temperatures between 590 and 650°C. This results in a decrease of the apparent activation barrier from 201 to 140kJmol-1, caused by the opening of a new reaction pathway. The kinetics of steam catalyzed decomposition of CaCO3 is discussed and a simple reaction scheme is proposed, including estimation of kinetic constants. The new pathway proceeds via formation of a stable surface bicarbonate followed by decomposition to surface OH groups, which then decompose by desorbing H2O.
AB - The search for cheap solutions for carbon dioxide capture in order to prevent global warming is still challenging. Calcium oxide may be a suitable sorbent, but the regeneration process from calcium carbonate requires too high temperatures, causing sintering and decreasing sorption capacity. In this study the effect of steam on the decomposition of the carbonate is investigated. A clear rate-enhancing effect up to a factor of 4 is observed when steam concentrations up to 1.25% are applied during isothermal reactions at temperatures between 590 and 650°C. This results in a decrease of the apparent activation barrier from 201 to 140kJmol-1, caused by the opening of a new reaction pathway. The kinetics of steam catalyzed decomposition of CaCO3 is discussed and a simple reaction scheme is proposed, including estimation of kinetic constants. The new pathway proceeds via formation of a stable surface bicarbonate followed by decomposition to surface OH groups, which then decompose by desorbing H2O.
KW - Calcium carbonate
KW - Carbon capture and storage
KW - Catalytic effect of water
KW - Decomposition reaction
KW - Greenhouse gases
U2 - 10.1016/j.jcou.2019.06.017
DO - 10.1016/j.jcou.2019.06.017
M3 - Article
VL - 33
SP - 341
EP - 356
JO - Journal of CO2 Utilization
JF - Journal of CO2 Utilization
SN - 2212-9820
ER -