Nitrogen adsorption with highly Li exchanged X-zeolites with low Si/Al ratio

摘要

Low silica X (LSX) zeolites having a framework Si/Al ratio equal to 1. 0 with lithium exchange levels greater than a threshold level of 70% exhibit unexpectedly higher capacity for nitrogen adsorption compared to LSX-zeolite with lower lithium exchange levels. These materials provide high performance adsorbents for PSA air separation processes at a lower cost for the adsorbent because of the lower threshold lithium exchange levels compared to highly exchanged lithium X- zeolite known in the prior art.