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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 39  1980
Some Aspects of ion-exchange and Catalytic Activity of Faujasite Type Molecular Sieve Zeolites
DIBYENDU GANGULI AND PRASENJIT SAHA
Pages : 57-62
DOI : 10.1080/0371750X.1980.10840723
Abstract
Natural and synthetic crystalline zeolites are characterized by frameworks originating from linkages of (Si, Al)-tetrahedra, in which structural cages and channels are occupied by water molecules and an appropriate amount of non· framework cations for balancing the negative charge of the available (AI02)- groups. Most common among these non-framework cations are Na+, Ca+ and K+ (in both natural and as-synthesized zeolites). Reversible and facile exchange of these cations with others is one of the characteristic properties of zeolites. The extents of such exchanges are guided by factors like crystallographic sites and structural openings involved, ionic hydration energies, hydrated radii of the ions etc. Technologically important ion exchanges in zeolites include Ni+, RE3+ (e.g. La3+, CeH) and NH4 + for sodium.
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