opens possibilities for the removal of impurities and for the improvement of the cationic
composition of the sample with low dealumination and with a smaller decrease of
crystallinity than with strong acids like HCl (Malharbe, 2001). In this study, the CO2 and N2
adsorption on acid treated natural zeolites and also synthetic zeolites at 5 and 25 ◦ C was
investigated. Sips and Langmuir adsorption …