Speciation of Fe in Fe-modified zeolite catalysts.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F10%3A10218061" target="_blank" >RIV/61989592:15310/10:10218061 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61388980:_____/10:00346577 RIV/68081723:_____/10:00346577 RIV/00216275:25310/10:39882006

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Speciation of Fe in Fe-modified zeolite catalysts.

Popis výsledku v původním jazyce

Fe-modified zeolites (ferrierite and MFI) were prepared by four impregnation methods followed by calcination and tested as catalysts in oxidative dehydrogenation of ethane by nitrous oxide at 350 degrees C. The Fe cationic and Fe oxidic species were identified by combination of UV-Vis spectroscopy and voltammetry. Monomeric or dimeric Fe ions have only UV absorption bands and some of them evolve voltammetrically identifiable [Fe(OH)(x)]((3-x)+) ions in contact with acetic acid-sodium acetate buffer. Feoxide nanoclusters characterised by UV band at about 28,000 cm(-1) are not detected by voltammetry under chosen conditions because they are situated inside the zeolite channels. Amorphous, nanocrystalline, and crystalline Fe(III) oxides were distinguished sensitively by their specific voltammetric reduction peaks at potentials -0.1 to -0.8 V/SCE in acetate buffer (pH 4.7) and by phase-specific electron pair transitions responsible for Vis absorption band centred at 17,500-21,000 cm(-1).

Název v anglickém jazyce

Speciation of Fe in Fe-modified zeolite catalysts.

Popis výsledku anglicky

Fe-modified zeolites (ferrierite and MFI) were prepared by four impregnation methods followed by calcination and tested as catalysts in oxidative dehydrogenation of ethane by nitrous oxide at 350 degrees C. The Fe cationic and Fe oxidic species were identified by combination of UV-Vis spectroscopy and voltammetry. Monomeric or dimeric Fe ions have only UV absorption bands and some of them evolve voltammetrically identifiable [Fe(OH)(x)]((3-x)+) ions in contact with acetic acid-sodium acetate buffer. Feoxide nanoclusters characterised by UV band at about 28,000 cm(-1) are not detected by voltammetry under chosen conditions because they are situated inside the zeolite channels. Amorphous, nanocrystalline, and crystalline Fe(III) oxides were distinguished sensitively by their specific voltammetric reduction peaks at potentials -0.1 to -0.8 V/SCE in acetate buffer (pH 4.7) and by phase-specific electron pair transitions responsible for Vis absorption band centred at 17,500-21,000 cm(-1).

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CB - Analytická chemie, separace

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2010

Kód důvěrnosti údajů

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

Název periodika

Journal of Electroanalytical Chemistry

ISSN

1572-6657

e-ISSN

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Svazek periodika

647

Číslo periodika v rámci svazku

1 (2010)

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

12

Strana od-do

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Kód UT WoS článku

000280863200002

EID výsledku v databázi Scopus

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