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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

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F05%3A00031109" target="_blank" >RIV/61388955:_____/05:00031109 - isvavai.cz</a>

  • Alternative codes found

    RIV/00216275:25310/05:00003291

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Analysis of Fe species in zeolites by UV-VIS-NIR, IR spectra and voltammetry. Effect of preparation, Fe loading and zeolite type

  • Original language description

    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).

  • Czech name

    Analýza Fe specií v zeolitech pomocí UV-VIS-NIR, IR spekter a voltametrie. Vliv preparace, koncentrace Fe a typu zeolitu

  • Czech description

    Byly použity tři postupy pro přípravu Fe-zeolitů s ZSM-5 (MFI), ferrieritem (FER) a zeolitem beta (BEA); postupy použity iontovou výměnu z roztoku FeCl3 v acetyl acetonu a iontovou výměnu z FeCl2 v proudu kyslíku nebo dusíku. Porovnání UV-VIS-NIR spekter, IR spekter skeletálních vibrací a adsorbovaného NO a také voltametrie poskytlo informace o typu vytvořených Fe specií. Samostatné Fe(III) iontové komplexy (Fe(H2O)6-xOHx) v hydratovaném zeolitu byly indikovány pomocí pásů přenosu náboje při 33 100, 37300 a 45 600 cm-1. Samostatné Fe(II) ionty v kationových posicích evakuovaného zeolitu poskytly (v důsledku perturbace lokálních T-O vazeb) charakteristické pásy (910-950 cm-1) v oblasti skeletálního okna. Tyto Fe(II) ionty po adsorpci NO jsou také indikovány vibrací při 1880 cm-1. Dinukleární Fe-oxo komplexy poskytly pás ve viditelné oblasti při 28 200 cm-1. Voltametrie ukázala na přítomnost oxidů železa (hematitu) s redukčním maximem při ? 0,7 V.

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    CF - Physical chemistry and theoretical chemistry

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/OC%20D15.20" target="_blank" >OC D15.20: Metal ion structures in crystalline matrices. Synthesis/structure/activity/selectivity relationship for development of catalysts for highly specific catalytic reactions.</a><br>

  • Continuities

    Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2005

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Microporous and Mesoporous Materials

  • ISSN

    1387-1811

  • e-ISSN

  • Volume of the periodical

    80

  • Issue of the periodical within the volume

    1-3

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    11

  • Pages from-to

    279-289

  • UT code for WoS article

  • EID of the result in the Scopus database