Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5423441 | Surface Science | 2012 | 6 Pages |
We present a detailed study of CO2 adsorption on CaO, by means of atomic-scale simulations relying on Density Functional Theory. Combining ab initio thermodynamics of the CO2 gas phase and a thorough analysis of its interaction with the oxide, we build an orientation-sensitive adsorption model, which demonstrates that low coverage by the gas is expected in a wide range of working conditions, including the domain of stability of CaCO3 calcite. Investigation of the interactions between the adsorbed molecules reinforces this conclusion. Our work thus provides a strong hint that calcite nucleation should occur by a localised mechanism, discarding the possibility of collective surface transformation.
⺠Thorough atomic-scale study of carbon dioxide adsorption on calcium oxide. ⺠Original treatment of interactions between adsorbed molecules. ⺠Ab initio quantitative assessment of CO2 adsorption levels. ⺠Hint that calcite nucleation occurs by localized mechanism.