Open AccessA STUDY ON Sn4+ CATION EXCHANGE NATURAL ZEOLITE TREATED AT DIFFERENT TEMPERATURES
Author(s) -
Yonghua Wu,
Huixiang Li,
Dazhi Wang,
Daoyuan Zhang
Publication year - 1992
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.41.1208
Subject(s) - zeolite , mössbauer spectroscopy , materials science , atmospheric temperature range , spectroscopy , electric field , analytical chemistry (journal) , chemistry , crystallography , thermodynamics , physics , environmental chemistry , catalysis , organic chemistry , quantum mechanics
The samples of Sn4+ zeolite are obtained by cation exchange between natural zeolite and SnCl4, and then treated at different Temperatures (70-1000℃). By using Mossbauer spectroscopy, X-ray diffraction and infra-red spectroscopy, we studied the change of position of Sn4+ in the zeolite structure with the temperature. The results show that the Sn4+ is situated in the main duct (channel) of the zeolite structure, but with the increase of the temperature the zeolite is dehydrated gradually, then the Sn4+ begins to move from the center of the duct to the walls of the duct, consequently, owing to the increase of the asymmetry of the electric field where the Sn4+ is situated, the quadruple splitting increases with the increase of the temperature. At the same time the SnO2 component increases with the increase of temperature. When heat-treatment temperature reached 1000℃ the long range order structure of zeolite may be destroyed completely.