Mechanism of Framework Oxygen Exchange in Fe-Zeolites: A Combined DFT and Mass Spectrometry Study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F13%3A00389992" target="_blank" >RIV/61388955:_____/13:00389992 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1002/cphc.201200900" target="_blank" >http://dx.doi.org/10.1002/cphc.201200900</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/cphc.201200900" target="_blank" >10.1002/cphc.201200900</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Mechanism of Framework Oxygen Exchange in Fe-Zeolites: A Combined DFT and Mass Spectrometry Study

Popis výsledku v původním jazyce

The role of framework oxygen atoms in N2O decomposition [N2O(g)!N2(g) and 1=2O2(g)] over Fe-ferrierite is investigated employing a combined experimental (N2 18O decomposition in batch experiments followed by mass spectroscopy measurements) and theoretical (density functional theory calculations) approach. The occurrence of the isotope exchange indicates that framework oxygen atoms are involved in the N2O decomposition catalyzed by Fe-ferrierite. Our study, using an Fe-ferrierite sample with iron exclusively present as FeII cations accommodated in the cationic sites, shows that the mobility of framework oxygen atoms in the temperature range: 553 to 593 K is limited to the four framework oxygen atoms of the two AlO4- tetrahedra forming cationic sites that accomodate FeII. They exchange with the Fe extra-framework 18O atom originating from the decomposed N2 18O. We found, using DFT calculations, that O2 molecules facilitate the oxygen exchange. However, the corresponding calculated energy

Název v anglickém jazyce

Mechanism of Framework Oxygen Exchange in Fe-Zeolites: A Combined DFT and Mass Spectrometry Study

Popis výsledku anglicky

The role of framework oxygen atoms in N2O decomposition [N2O(g)!N2(g) and 1=2O2(g)] over Fe-ferrierite is investigated employing a combined experimental (N2 18O decomposition in batch experiments followed by mass spectroscopy measurements) and theoretical (density functional theory calculations) approach. The occurrence of the isotope exchange indicates that framework oxygen atoms are involved in the N2O decomposition catalyzed by Fe-ferrierite. Our study, using an Fe-ferrierite sample with iron exclusively present as FeII cations accommodated in the cationic sites, shows that the mobility of framework oxygen atoms in the temperature range: 553 to 593 K is limited to the four framework oxygen atoms of the two AlO4- tetrahedra forming cationic sites that accomodate FeII. They exchange with the Fe extra-framework 18O atom originating from the decomposed N2 18O. We found, using DFT calculations, that O2 molecules facilitate the oxygen exchange. However, the corresponding calculated energy

Druh

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

CEP obor

CF - Fyzikální chemie a teoretická chemie

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)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název periodika

ChemPhysChem

ISSN

1439-4235

e-ISSN

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Svazek periodika

14

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

11

Strana od-do

520-531

Kód UT WoS článku

000315142900009

EID výsledku v databázi Scopus

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