Tailoring of the structure of Fe-cationic species in Fe-ZSM-5 by distribution of Al atoms in the framework for N2O decomposition and NH3-SCR-NOx

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F14%3A00425817" target="_blank" >RIV/61388955:_____/14:00425817 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jcat.2014.01.019" target="_blank" >http://dx.doi.org/10.1016/j.jcat.2014.01.019</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jcat.2014.01.019" target="_blank" >10.1016/j.jcat.2014.01.019</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tailoring of the structure of Fe-cationic species in Fe-ZSM-5 by distribution of Al atoms in the framework for N2O decomposition and NH3-SCR-NOx

Popis výsledku v původním jazyce

The heterogeneity and redox behavior of Fe-cationic species in Fe-ZSM-5 catalysts for N2O decomposition and NH3-SCR-NOx were analyzed by Mössbauer and UV?Vis spectroscopy, TPR-H2, and reaction kinetic measurements. Iron was introduced into ZSM-5 zeolitesof similar Si/Al but with different populations of close (Al?Si?Si?Al sequences in one ring ? Al pairs) and far distant (single Al in different rings) Al atoms in the zeolite framework. It has been found that Al pairs in 6MRs of the framework greatly stabilize divalence of bare Fe(II) ions and [Fe(II)?O?Fe(II)]2+ complexes even in oxidizing atmosphere. These species were completely oxidized only with N2O and recognized as the most active sites in N2O decomposition. On the contrary, the prevailing concentration of single Al atoms resulted at comparable conditions in high population of Fe(III)-oxo species. Fe(III)-oxo species of low nuclearity with partially compensated positive charge by the zeolite framework facilitate the formation of

Název v anglickém jazyce

Tailoring of the structure of Fe-cationic species in Fe-ZSM-5 by distribution of Al atoms in the framework for N2O decomposition and NH3-SCR-NOx

Popis výsledku anglicky

The heterogeneity and redox behavior of Fe-cationic species in Fe-ZSM-5 catalysts for N2O decomposition and NH3-SCR-NOx were analyzed by Mössbauer and UV?Vis spectroscopy, TPR-H2, and reaction kinetic measurements. Iron was introduced into ZSM-5 zeolitesof similar Si/Al but with different populations of close (Al?Si?Si?Al sequences in one ring ? Al pairs) and far distant (single Al in different rings) Al atoms in the zeolite framework. It has been found that Al pairs in 6MRs of the framework greatly stabilize divalence of bare Fe(II) ions and [Fe(II)?O?Fe(II)]2+ complexes even in oxidizing atmosphere. These species were completely oxidized only with N2O and recognized as the most active sites in N2O decomposition. On the contrary, the prevailing concentration of single Al atoms resulted at comparable conditions in high population of Fe(III)-oxo species. Fe(III)-oxo species of low nuclearity with partially compensated positive charge by the zeolite framework facilitate the formation of

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

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Journal of Catalysis

ISSN

0021-9517

e-ISSN

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Svazek periodika

312

Číslo periodika v rámci svazku

APR 2014

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

123-138

Kód UT WoS článku

000335111300013

EID výsledku v databázi Scopus

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