X Zeolites are crystalline microporous oxides with pore size intherangeof11–14A ̊.Althoughtheirchemicalcompositionis limited to aluminosilicate tetrahedra, cations (usually Na) should be introduced to compensate the negative charge of oxygen linked to Al atoms in the framework. This chemical versatility allows for the modification of some physicochemical zeolite properties (such as acidity, redox properties, or hydrophobic–hydrophilic nature) and, consequently, tunes them for a specific application [5].