Critical evaluation of the role of the distribution of Al atoms in the framework for the activity of metallo-zeolites in redox N2O/NOx reactions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F14%3A00427597" target="_blank" >RIV/61388955:_____/14:00427597 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.apcata.2013.07.033" target="_blank" >http://dx.doi.org/10.1016/j.apcata.2013.07.033</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apcata.2013.07.033" target="_blank" >10.1016/j.apcata.2013.07.033</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Critical evaluation of the role of the distribution of Al atoms in the framework for the activity of metallo-zeolites in redox N2O/NOx reactions

Popis výsledku v původním jazyce

Both the laboratory synthesized zeolites with tailored distribution of framework Al atoms and commercial ZSM-5 zeolites of various proveniences were investigated in a broad region of Si/Al ratio with respect to the distribution of Al atoms in the framework. The analysis of the distribution of framework Al atoms was done by using strictly defined conditions of Co(II) ion exchange and UV-Vis, 27Al and 29Si (CP) MAS NMR experiments. Evidence has been found that the distribution of framework Al atoms in ZSM-5, and in Si-rich zeolites in general, is not random and is not controlled by statistics, but occurs between the most populated Al pairs (Al-Si-Si-Al sequences in 6MRs) and single far distant Al atoms (Al-Sin>2-Al sequences) located in different rings.Depending on the type of Si- and Al-reactants and presence of TPA+/Na+ in gels, a broad distribution of Al atoms (from 5 to 85% of Al atoms in Al pairs) for Si/Al 12-20 can be achieved. At Si/Al > 20, the population of Al pairs decreases,

Název v anglickém jazyce

Critical evaluation of the role of the distribution of Al atoms in the framework for the activity of metallo-zeolites in redox N2O/NOx reactions

Popis výsledku anglicky

Both the laboratory synthesized zeolites with tailored distribution of framework Al atoms and commercial ZSM-5 zeolites of various proveniences were investigated in a broad region of Si/Al ratio with respect to the distribution of Al atoms in the framework. The analysis of the distribution of framework Al atoms was done by using strictly defined conditions of Co(II) ion exchange and UV-Vis, 27Al and 29Si (CP) MAS NMR experiments. Evidence has been found that the distribution of framework Al atoms in ZSM-5, and in Si-rich zeolites in general, is not random and is not controlled by statistics, but occurs between the most populated Al pairs (Al-Si-Si-Al sequences in 6MRs) and single far distant Al atoms (Al-Sin>2-Al sequences) located in different rings.Depending on the type of Si- and Al-reactants and presence of TPA+/Na+ in gels, a broad distribution of Al atoms (from 5 to 85% of Al atoms in Al pairs) for Si/Al 12-20 can be achieved. At Si/Al > 20, the population of Al pairs decreases,

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

<a href="/cs/project/GAP106%2F11%2F0624" target="_blank" >GAP106/11/0624: Nová kategorie zeolitů s pentasilovou strukturou: Katalytické procesy na zeolitech s řízenou distribucí hliníku ve skeletu</a><br>

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

Applied Catalysis A - General

ISSN

0926-860X

e-ISSN

—

Svazek periodika

474

Číslo periodika v rámci svazku

MAR 2014

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

178-185

Kód UT WoS článku

000336005800022

EID výsledku v databázi Scopus

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