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Analysis of Fe species in zeolites by UV-VIS-NIR, IR spectra and voltammetry. Effect of preparation, Fe loading and zeolite type
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SYSNO ASEP 0031109 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Analysis of Fe species in zeolites by UV-VIS-NIR, IR spectra and voltammetry. Effect of preparation, Fe loading and zeolite type Title Analýza Fe specií v zeolitech pomocí UV-VIS-NIR, IR spekter a voltametrie. Vliv preparace, koncentrace Fe a typu zeolitu Author(s) Čapek, Libor (UFCH-W)
Kreibich, Viktor (UFCH-W)
Dědeček, Jiří (UFCH-W) RID, ORCID
Grygar, Tomáš (UACH-T)
Wichterlová, Blanka (UFCH-W) RID
Sobalík, Zdeněk (UFCH-W) RID
Martens, J. A. (BE)
Brosius, R. (BE)
Tokarová, V. (CZ)Source Title Microporous and Mesoporous Materials. - : Elsevier - ISSN 1387-1811
Roč. 80, 1-3 (2005), s. 279-289Number of pages 11 s. Language eng - English Country NL - Netherlands Keywords Fe-zeolites ; UV-VIS spectra ; IR spectra ; voltammetry ; Fe complexes Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects OC D15.20 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z40400503 - UFCH-W (2005-2011) Annotation Three procedures were employed for the preparation of Fe-zeolites with ZSM-5 (MFI), ferrierite (FER) and beta (BEA) structures: ion exchange from FeCl3 solution in acetyl acetonate and solid-state ion exchange from FeCl2 using an oxygen or nitrogen stream. A combination of UV-VIS-NIR spectra, IR spectra of skeletal vibrations and of adsorbed NO, as well as voltammetry provided information on the type of Fe species introduced. Single Fe(III) ion complexes (Fe(H2O)(6-x)OHx) in hydrated zeolites were reflected in the charge-transfer bands at 33100, 37300 and 45600 cm(-1). The single Fe(II) ions at cationic sites in evacuated zeolites yielded (through perturbation of framework T-O bonds) characteristic bands (910-950 cm(-1)) in the region of the skeletal window. These Fe(II) ions with adsorbed NO were also reflected in vibrations at 1880 cm(-1). Dinuclear Fe-oxo complexes yielded the Vis band at 28200 cm(-1). Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2006
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