Study of structural transformations in potassium- exchanged zeolite A induced by thermal and mechanochemical treatments (CROSBI ID 81832)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Kosanović, Cleo ; Subotić, Boris ; Šmit, Ivan ; Čižmek, Anja ; Stubičar, Mirko ; Tonejc, Antun
engleski
Study of structural transformations in potassium- exchanged zeolite A induced by thermal and mechanochemical treatments
Thermal transformations of potassium-exchanged zeolite A and the X-ray amorphous material obtained by ball milling the potassium-exchaged zeolite A were investigated by different methods, such as differential thermogravimetric analysis (DTA), differential scanning calorimetry (DSC), X- ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Controlled heating of crystalline, potassium-exchanged zeolite A causes a phase transformation in the sequence: [0.22Na2O, 0.78K2O]x(Al2O3)x(2SiO2)x(3.48H2O)--- amorphous phase---crystalline (kalsilite+kaliophilite) phases, while the heating of mechanochemically amorphous potassium-exchanged zeolite A results in its transformation into a mixture of kalsilite and kaliophilite. The differences in the pathways of the transformation processes are discussed in terms of the structural properties of the starting materials.
structural transformations ; potassium-exchanged zeolite A ; amorphization by thermal or mechanochemical treatments ; crystallization processes ; differential thermal analysis (DTA) ; X-ray diffraction (XRD) ; Fourier transform infrared (FTIR) spectroscopy.
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Podaci o izdanju
32
1997.
73-78
objavljeno
0022-2461
1573-4803
10.1023/A%3A1018514929882