Zeolitic adsorbents, their process of preparation and their uses

An agglomerated zeolitic adsorbent, based on crystals of zeolite X and on at least one non-zeolitic phase, wherein:

• the crystals of zeolite X exhibit:
• i. a number-average diameter of less than or equal to 1.7 μm
• ii. an Si/Al atomic ratio of between 1.00 and 1.50, limits included,
• the content by weight of non-zeolitic phase (NZP) is such that 2.0%<NZP<5.0%, by weight of the total weight of the adsorbent,
• the content by weight of barium oxide (BaO) is greater than 23%, with respect to the total weight of the adsorbent,
• the content by weight of potassium oxide K2O is less than 9%, with respect to the total weight of the adsorbent, and
• the total content by weight of oxides of alkali metal or alkaline earth metal ions, other than BaO and K2O, is less than 5% with respect to the total weight of the adsorbent.