Removal of krypton and xenon impurities from argon by MOF adsorbent

A method of removing krypton and/or xenon impurities from an argon gaseous mixture, said method comprising the steps of:

• (a) obtaining an argon gaseous mixture comprising argon and impurities of krypton and/or xenon;
• (b) flowing the mixture through a cartridge containing one or more adsorbents made of a metal organic framework (MOF);
• and
• (c) producing purified argon from the cartridge,
• wherein the argon gaseous mixture has an argon concentration of at least 99% v/v,
• wherein the purified argon produced in step (c) has a krypton concentration of less that or equal to 0.5 ppm krypton w/w and/or a xenon concentration of less that or equal to 0.25 ppm w/w, and
• wherein the temperature of the MOF is between −26 degrees C and −200 degrees C.