| 초록 |
The enhancement mechanism of H2O dissociation-promoted CO2 sorption on the MgCeOx surface was studied through in situ DRIFTS analysis. Among solid CO2 sorbents, MgO attracts attention due to its applicability at high pressure and intermediate temperature. Notably, it has been found that H2O promotes sorption performance but still lacks insight into the dynamic sorption process under the corresponding conditions. Herein, the main contributor and mechanism to the CO2 sorption in each condition were analyzed through the in situ DRIFTS results measured with the injection of a mixture gas of CO2, H2O, and Ar. The adsorbed OH groups grew significantly with monodentate carbonate at the early sorption stage, leading to H2O dissociation-promoted sorption process. This study reveals the contribution of H2O to the performance improvement of the sorbent when applying the MgO-based CO2 sorbent to the actual process. |
