Original scientific paper

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

Cleo Kosanović ; Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
Boris Subotić ; Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia
Alenka Ristić ; National Institute of Chemistry, Hajdrihova 19, p.p. 660, SI-1000 Ljubljana, Slovenia

Abstract

Thermal treatment of (NH₄, Na)-exchanged zeolites 4A and 13X results in the formation of an amorphous phase (T < 1000 °C) and a crystalline phase of mullite at temperatures above 1000 °C. No structural changes have been noticed for the (NH₄, Na)-exchanged synthetic mordenite treated under 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.

Keywords

ion exchanged zeolites; thermal transformations; pseudomorphic transformation; mullite

Hrčak ID:

129321

URI

https://hrcak.srce.hr/129321

Publication date:

1.8.2002.

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