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Structural and morphological Transformations of the (NH4, Na)-exchanged Zeolites 4A, 13X and Synthetic Mordenite by ThermalTreatment

Thermal treatment of (NH4, Na)-exchanged Zeolites 4A and 13X results in the formation of an amorphous phase (below 1000 oC) and a crystalline phase of mullite at temperatures above 1000 oC. No structural changes are noticed for the (NH4, Na)-exchanged synthetic mordenite treated at the same conditions. Scanning electron microscopy (SEM), X-ray powder diffraction, Fourier transform infrared (FT-IR) spectroscopy and particle size analysis were used to characterize the initial materials and the obtained products.

Ion-exchanged zeolites; thermal transformations; pseudomorphic transformation; mullite

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