Abstract
The effect of several divalent cations (Mn2+, Mg2+, Ni2+, and Co2+) exchanged in Na-ferrierite and ammonia adsorption/desorption was studied by FTIR spectroscopy in the range 4000−400 cm-1. The complete cation exchange eliminated zeolite bridging acidic hydroxyls and provided for monitoring of the stretching and bending modes of ammonia interacting with cations and the accompanying parallel changes of the zeolite lattice vibrations induced by bare cations and cation−ligand complexes at various ammonia coverage. Dehydration of ferrierites with ion-exchanged divalent cations gives formation of new IR bands in the transmission window between antisymmetric (around 1070 cm-1) and symmetric (around 780 cm-1) T−O−T stretching lattice modes. These new bands disappear upon full saturation by ammonia and reappear under complete ammonia desorption. They are assigned to antisymmetric stretching T−O−T mode of zeolitic lattice shifted to a lower frequency due to the reversible local deformation of the flexible zeolitic...
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