Alteration of Adsorption Selectivity of LSX Zeolite in Li+ and H+ forms towards CO2 and N2O

The adsorption and textural properties of LSX zeolite after cation exchange both in LiCl and NH Cl aqueous solutions have been evaluated from elemental analysis, XRD, N adsorption at 77K, and CO and N O adsorption at 273K. Incorporation of Li and H results in a significant decrease of adsorption selectivity towards CO in a pressure range 0.01 - 1 Torr compared to the initial LSX in the K-Na form. This feature allows simultaneous quantitative sequestration of CO and N O traces from contaminated gas flows, or can be useful for pre-concentration of these gases prior to catalytic utilization. Above 1 Torr adsorption selectivity rises to 1.0 for the unmodified LSX, but incorporation of Li+ and H+ increases it in the range 5 - 50 Torr, allowing adsorption purification of N O from CO diluted an in inert gas flow under the applied conditions.