Characterization of glycine metal salts for CO₂ absorption

This work deals with the chemical characterization of glycine aqueous solution in CO₂ absorption. Three alkali elements were impregnated into the glycine in order to facilitate the formation of amino functionalities. The analysis by IR revealed the transformation of ammonium ions to the amino group. In addition, the NMR analysis showed that the substitution of metal cations to the chemical shift of hydrogen and carbon atoms in glycine; in order of lithium glycinate, sodium glycinate and potassium glycinate depending on the electro negativity. Meanwhile, the CO₂ absorption at room temperature was the highest in primary amine solution, but at the increasing temperature sodium glycinate could capture more CO₂ than that of the pure amine solution.