{HEAD ~ Xenon} and krypton are recovered from oxygen containing gas, typically derived from liquid oxygen bottoms in a cryogenic air separation plant, by 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 {TAIL ~ the adsorbent} 
{ HEAD ~ Xenon } and krypton are recovered from oxygen containing gas , typically derived from liquid oxygen bottoms in a cryogenic air separation plant , by 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 { TAIL ~ the adsorbent }
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