Xenon and krypton are recovered from oxygen containing gas, typically derived from liquid oxygen bottoms in {HEAD ~ a cryogenic air separation plant}, by {TAIL ~ selective adsorption} on a Li and Ag exchange zeolite containing 5 to 40% Ag exchange capacity on an equivalents basis, with periodic thermal regeneration of the adsorbent 
Xenon and krypton are recovered from oxygen containing gas , typically derived from liquid oxygen bottoms in { HEAD ~ a cryogenic air separation plant } , by { TAIL ~ selective adsorption } on a Li and Ag exchange zeolite containing 5 to 40 % Ag exchange capacity on an equivalents basis , with periodic thermal regeneration of the adsorbent
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