Patent ID: 8597584

Claim:
A gas purifying device for removing trace constituents from a mixed gas containing a rare gas selected from at least one of krypton and xenon and nitrogen as main components; and at least one from among hydrogen, reaction products containing both nitrogen and hydrogen, water vapor and nitrogen oxides as said trace constituents, said device provided with the following devices (i)-(vi) in this order: (i) reducing substance adding device for adding ammonia or hydrogen to said mixed gas as a reducing substance; (ii) denitration device for reacting the nitrogen oxides present in the mixed gas after addition of the reducing substance, with said reducing substance by means of a catalytic denitration reaction, and converting said nitrogen oxides to nitrogen and water vapor; (iii) an adsorbing device for removing water vapor and reaction products containing both nitrogen and hydrogen, in the mixed gas exiting from said denitration device by using potassium ion-exchanged A-type zeolite as an adsorbent; (iv) an oxygenation device for adding oxygen to the mixed gas that is leaving said adsorbing device; (v) a hydrogen oxidation device for converting the hydrogen in the mixed gas after the oxygen has been added to water vapor by causing a reaction with said oxygen using a hydrogen oxidation catalyst; and (vi) a drying device for removing the water vapor generated in said hydrogen oxidation device by using potassium ion-exchanged A-type zeolite as an adsorbent.