| http://www.w3.org/ns/prov#value | - carried out depending on the content of impurity contained in exhaust gas for recovery ot noble gasUS6277342 *Aug 23, 1999Aug 21, 2001Air Products And Chemicals, Inc.A support including at least one polymer sufficiently acidic to protonate the gas is contacted with the gas to protonate the gas to form a solid salt which is sorbed by the support. the gas is dispensed by deprotonationUS6309446 *Aug
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