Microenvironments in faujasite-type Fe-Al zeolites probed by europium luminescence

Chemistry Letters

Volumn 34, Issue 4, 2005, Pages 490-491

  Nakamura, Yasushi ^a   Hasaegawa, Masatoshi ^a   Katsuki, Kazuko ^a  

^a TOHO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ALUMINUM; EUROPIUM; IRON; WATER; ZEOLITE;

ADSORPTION; ARTICLE; CHEMICAL BOND; COMPARATIVE STUDY; DESORPTION; HYDRATION; ION EXCHANGE; LUMINESCENCE; MICROENVIRONMENT; PHOTOLUMINESCENCE; SPECTROSCOPY; TEMPERATURE MEASUREMENT;

EID: 21744440006     PISSN: 03667022     EISSN: None     Source Type: Journal    
DOI: 10.1246/cl.2005.490     Document Type: Article

References (12)

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10. Similarly to hydrated zeolites, water-solubilized reverse micelles (W/O microemulsion) also include different types of water in the micellar core; water incorporated to ionic sites (bound water), water hydrogen-bonded to the bound water (intermediate water), and bulk-like water with the following order of polarity: bulk water > intermediate water > bound water (see ref 11).
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12. Physisorbed water in zeolites behaves as intermediate water between the bulk water desorbed below 100 C and the coordinated water. The physisorbed water molecules are located between the coordinated water molecules in zeolites. An increase in the amount of physisorbed water most likely allows the formation of relatively weakly hydrogen-bonded water molecules with the coordinated water. This can cause a shift of desorption temperature toward lower temperatures.