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VPSA System. Oxygen Plants. For these non-cryogenic O2 plants, Zeochem also offers a variety of adsorbents with high N2 capacity and high N2/O2 selectivity. The latest generation products such as Z10-04, for PSA units, and Z10-05-03, an advanced LiLSX adsorbent for VSA plants, provide customers with improved plant economics.