Figures & data
Figure 1. The mole fraction solubility (x) of NO as a function of temperature in different (2:1 mole ratio) ILs.
Figure 2. The mole fraction solubility (x) of NO2 as a function of temperature in different (2:1 mole ratio) ILs.
Figure 3. The color change of caprolactam tetrabutyl ammonium bromide ionic liquids with different concentrations of NOx. (a) Caprolactam tetrabutyl ammonium bromide ionic liquid; (b) after bubbling NO for 20 min; (c) after bubbling NO2 for 20 min.
Figure 4. The mole fraction solubility (x) of NO as a function of temperature at different mole ratios of CPL and TBAB.
Figure 5. The mole fraction solubility (x) of NO2 as a function of temperature at different mole ratios of CPL and TBAB.
Figure 6. The mole fraction solubility (x) of N2, CO2, NO, and NO2 as a function of temperature at CPL and TBAB (mole ratio, 2:1).
Figure 7. The mole fraction solubility (x) of NOx desorption by vacuum rotary evaporator at different mole ratios of CPL and TBAB. After the ILs were reused, the absorption of gas was equal to the amount of absorbed gas. ▪ 2:1; • 3:1 (the desorption of NO); ▴ 2:1; ▾ 3:1 (the desorption of NO2).
Figure 8. 1H-NMR spectra ((CD3)2SO, 500 Hz) of CPL-TBAB IL and CPL-TBAB IL with NOx gas.
