3. Resultsanddiscussion
3.1. Adsorbentcharacterization
3.1.1. Nitrogen adsorption/desorption isotherms
The textural properties of the pristine and amino-impregnated zeolites are shown in Table 2. A progressive reduction of the spe- cific surface area and pore volume were observed as the amine concentration increases, which indicates that MEA tends to fill and obstruct micropores, preventing nitrogen from being adsorbed. Only the textural characteristics for the pristine zeolite and that