Naslov
Thermal and mechanochemical transformations of potassium exchanged zeolite A

Autori
Kosanović, Cleo ; Subotić, Boris ; Šmit, Ivan ; Čižmek, Ankica

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Fifth Slovenian - Croatian Crystallographic Meeting - Programme and Book of Abstracts / Golič, Ljubo ; Leban, Ivan ; Golobič, Amalija - Ljubljana : Slovenian Crystallographic Society, 1996, 34-34

Skup
Fifth Slovenian - Croatian Crystallographic Meeting

Mjesto i datum
Zreče, Slovenija, 13.06.1996. - 15.06.1996

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Zeoliti; Modeliranje; Kristalizacija; Populacijska ravnoteža
(Zeolites; Modeling; Crystallization; Population balance)

Sažetak
Thermal transformations of potassium-exchanged zeolite A and the x-ray amorphous material obtained by ball milling of the potassium-exchanged zeolite A were investigated by different methods such as: differential thermogravimetry (DTG), differential scanning calorimetry (DSC), X-ray diffractometry, FTIR spectroscopy and scanning-electron microscopy. Controlled heating of crystalline, potassium-exchanged zeolite A causes a phase transformation in the sequence: [0.22Na2O, 0.78K2O] Al2O3 2 SiO2 3.48 H2O amorphous kalsilite + kaliophiliote, while the heating of mechanochemically amorphized potassium-exchanged zeolite A results in its transformation into a mixture of kalsilite and kaliphilite, or even to pure kalsilite at higher transformation temperatures. The differences in the pathways of transformation processes are discussed in the term of structural properties of the starting materials.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA