Study of structural transformations in potassium-exchanged zeolite A induced by thermal and mechanochemical treatments

被引：43

作者：

Kosanovic, C ^{[1
]}

Subotic, B ^{[1
]}

Smit, I ^{[1
]}

Cizmek, A ^{[1
]}

Stubicar, M ^{[1
]}

Tonejc, A ^{[1
]}

机构：

[1] UNIV ZAGREB, FAC SCI, DEPT PHYS, ZAGREB 10001, CROATIA

来源：

JOURNAL OF MATERIALS SCIENCE | 1997年 / 32卷 / 01期

关键词：

D O I：

10.1023/A:1018514929882

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thermal transformations of potassium-exchanged zeolite A and the X-ray amorphous material obtained by ball milling the potassium-exchanged 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: [0.22 Na2O, 0.78 K2O]. Al2O3 . 2SiO(2) . 3.48 H2O double right arrow amorphous double right arrow kalsilite + kaliophilite, 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.

引用

页码：73 / 78

页数：6

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