CATION-EXCHANGE REACTIONS OF A SEDIMENTARY CHABAZITE

Authors
TORRACCA E GALLI P PANSINI M COLELLA C
Citation
E. Torracca et al., CATION-EXCHANGE REACTIONS OF A SEDIMENTARY CHABAZITE, MICROPOROUS AND MESOPOROUS MATERIALS, 20(1-3), 1998, pp. 119-127
Citations number
28
Categorie Soggetti
Chemistry Physical","Material Science","Chemistry Applied
Journal title
MICROPOROUS AND MESOPOROUS MATERIALS → ACNP
ISSN journal
13871811
Volume
20
Issue
1-3
Year of publication
1998
Pages
119 - 127
Database
ISI
SICI code
1387-1811(1998)20:1-3<119:CROASC>2.0.ZU;2-F
Abstract
The ion exchange behaviour of a Na-exchanged sedimentary chabazite for Pb2+, NH4+, K+, Ca2+ and Mg2+ was investigated. Equilibrium data were obtained at 25 degrees C for Pb2+, NH4+ and K+ and interpreted in ter ms of two different cation sites in the zeolite framework. A good sele ctivity was observed for NH4+ and Pb2+ and the selectivity sequence NH 4+>K+>Pb2+>Na+ was determined. Very low exchange rates were found for Ca2+ and Mg2+ whereas fast kinetics were observed for NH4+ and Pb2+ ei ther by chabazite in its original composition or especially by Na-exch anged chabazite. (C) 1998 Elsevier Science B.V.