Abstract
AbstractMicroporous zeolites Na‐Y and K‐Y were converted into the NaNH4‐Y and KNH4‐Y modifications by ion exchange being active in dealumination. Removal of framework aluminium and silicon is accompanied by formation of secondary mesopores. Internal mesopores are formed in the centre of zeolite crystals and external pores at their surface. Formation of mesopores changes the sorption behaviour.Residual alkali metal cations as Na+ or K+ stabilise, however, the framework ≡Si‐O‐Al≡ bonds. Because of inhomogeneous distribution of sodium ions, in NaNH4‐Y less internal but more external mesopores are formed. Potassium ions of KNH4‐Y are more homogeneous distributed over the framework why a more balanced formation of secondary pores takes place.
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