Oxygen transfer centers in Fe-FER and Fe-MFI zeolites: redox behavior and Debye temperature derived from in situ Mossbauer spectra

Authors
Lazar, K Kotasthane, AN Fejes, P
Citation
K. Lazar et al., Oxygen transfer centers in Fe-FER and Fe-MFI zeolites: redox behavior and Debye temperature derived from in situ Mossbauer spectra, CATAL LETT, 57(4), 1999, pp. 171-177
Citations number
29
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
CATALYSIS LETTERS
ISSN journal
1011372X → ACNP
Volume
57
Issue
4
Year of publication
1999
Pages
171 - 177
Database
ISI
SICI code
1011-372X(1999)57:4<171:OTCIFA>2.0.ZU;2-3
Abstract
77 and 300 K in situ Mossbauer spectra recorded after redox treatments of F e-FER and Fe-MFI ferrisilicates are compared. Similar behavior is found for the two catalysts; reversible redox processes can be detected. Oxidation a nd coordination states are identified after various treatments, and the val ue of the average Debye temperature is estimated (260 < Theta(D) < 300 K). Analysis and comparison of data support the assignment of redox centers to Fe-framework-O-Feextra-framework pairs.