| 초록 |
Hydrate-based gas separation (HBGS) has been suggested as a novel pathway to respond to CO2 emission reduction. In this study, CO2 capture from fuel gas mixture of CO2 (40%) + H2 (60%) using TBAC semiclathrate was explored to evaluate the feasibility of semiclathrate-based pre-combustion CO2 capture. The phase equilibria of CO2 (40%) + H2 (60%) + TBAC (1.0, 3.3, and 5.0 mol%) semiclathrates were measured to examine the thermodynamically stable region. The gas uptake and the CO2 concentration changes in the vapor phase were also monitored to clarify CO2 selectivity between the vapor and semiclathrate phases. The enclathration of CO2 and H2 into the TBAC semiclathrate was confirmed via Raman spectroscopy. The dissociation enthalpy of CO2 + H2 + TBAC semiclathrates was measured via a HP μ-DSC. The TBAC semiclathrates showed a remarkably high CO2 selectivity (~94%) with one step of formation. The overall experimental results provide the fundamental data for designing the pre-combustion CO2 capture process using TBAC semiclathrate. |
