Regarding thermodynamics, equilibrated states were measured for three reactor temperatures below the ice point and found to agree well with theoretical values computed using CSMGem . To our knowledge, this is the first experimental data of this kind on the N 2 -CO 2 system for temperatures lower than 260 K. Remarkably, even though no chemical additives were used in these experiments, the formation pressures achieved are comparable to those obtained when using tetrahydrofuran, a well-known and established promoter. With equilibrium concentrations as low as 1.5%, the process under consideration enables post-combustion capture of CO 2 from the lean gas mixtures typical of gas turbine emissions-a feat highly desirably for any carbon capture process.