The crystal structures of natural and hydrated Na-, Ca-, Sr-, and K-exchanged chabazite from Keller (Germany) were refined at room temp. in the R‾3m space group. The most probable distribution of ions indicates the presence of 4 cation sites; 1 at the center of the hexagonal prism, 2 in the large cage along the [111] diagonal, and the 4th near the 8-ring window which is split into 2 sites close to each other in the monovalent exchanged forms. The site at the center of the D6R is empty in the Na and K-exchanged chabazites. In this last form, 1 of the 2 sites along [111] is also empty. H2O mols. are spread over a large no. of sites, 1 with 100% occupancy, at the center of the 8-ring window, the others, normally with low occupancy, inside the large cage. Occupancies of both cation and H2O mol. sites vary greatly in the different forms.

Position of cations and water molecules in hydrated chabazite. Natural and sodium, calcium, strontium, and potassium-exchanged chabazites / A., Alberti; Galli, Ermanno; Vezzalini, Maria Giovanna; Passaglia, Elio; P. F., Zanazzi. - In: ZEOLITES. - ISSN 0144-2449. - STAMPA. - 2:(1982), pp. 303-309.

Position of cations and water molecules in hydrated chabazite. Natural and sodium, calcium, strontium, and potassium-exchanged chabazites

GALLI, Ermanno;VEZZALINI, Maria Giovanna;PASSAGLIA, Elio;
1982-01-01

Abstract

The crystal structures of natural and hydrated Na-, Ca-, Sr-, and K-exchanged chabazite from Keller (Germany) were refined at room temp. in the R‾3m space group. The most probable distribution of ions indicates the presence of 4 cation sites; 1 at the center of the hexagonal prism, 2 in the large cage along the [111] diagonal, and the 4th near the 8-ring window which is split into 2 sites close to each other in the monovalent exchanged forms. The site at the center of the D6R is empty in the Na and K-exchanged chabazites. In this last form, 1 of the 2 sites along [111] is also empty. H2O mols. are spread over a large no. of sites, 1 with 100% occupancy, at the center of the 8-ring window, the others, normally with low occupancy, inside the large cage. Occupancies of both cation and H2O mol. sites vary greatly in the different forms.
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Position of cations and water molecules in hydrated chabazite. Natural and sodium, calcium, strontium, and potassium-exchanged chabazites / A., Alberti; Galli, Ermanno; Vezzalini, Maria Giovanna; Passaglia, Elio; P. F., Zanazzi. - In: ZEOLITES. - ISSN 0144-2449. - STAMPA. - 2:(1982), pp. 303-309.
A., Alberti; Galli, Ermanno; Vezzalini, Maria Giovanna; Passaglia, Elio; P. F., Zanazzi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/737732
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