FTIR Study of Carbon Dioxide Interaction with some Room Temperature Ionic Liquids

Four ionic liquids were investigated for abilities to capture CO2 alone or with added catalyst at room temperature and atmospheric pressure. Hydrated aluminum nitrate Al (NO3)3.9H2O-urea with added CaO, hydrated ammonium aluminum sulfate NH4Al (SO4)2.12H2O-urea with added solid NaOH did not show in FTIR chart sign of either physical or chemical absorption of CO2, however hydrated ammonium aluminum sulfate NH4Al (SO4)2.22H2O-urea with added NaOHaq or few water showed a chemical absorption of CO2 at 1666 cm-1 as in aluminum chloride-urea ionic liquid while aluminum chloride-acetamide showed weaker or no ability to capture CO2.