On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F12%3A00375929" target="_blank" >RIV/61388955:_____/12:00375929 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.micromeso.2011.10.014" target="_blank" >http://dx.doi.org/10.1016/j.micromeso.2011.10.014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.micromeso.2011.10.014" target="_blank" >10.1016/j.micromeso.2011.10.014</a>

Jazyk výsledku

angličtina

Název v původním jazyce

On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites

Popis výsledku v původním jazyce

FTIR study of iron and aluminium forms of zeolite MCM-58 showed that location of heteroatoms in this IFR structure depends on the type of heteroatom. The combination of the pyridine and CO adsorption allowed determination of the concentration of hydroxyls in the 12- and 5/6-rings. Both Fe and Al are generating hydroxyls pointing towards either 12-ring or 5/6-rings but the former are located in positions giving Si?OH?Fe hydroxyls pointing mainly to the 12-rings while the latter gives rise to the Si?OH?Algroups pointing primarily to the narrower 5- and 6-rings. (Al)MCM-58 undergoes only minor dehydroxylation associated with the acid sites even at temperatures as high as 700 °C, which indicates unique stabilization of Al atoms in the IFR structure. In the case of (Fe)MCM-58, dehydroxylation is more extensive. Furthermore the OH located in the 5/6-rings dehydroxylate at lower temperatures than those in the 12-rings. The study also demonstrates that the concentration of the framework and e

Název v anglickém jazyce

On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites

Popis výsledku anglicky

FTIR study of iron and aluminium forms of zeolite MCM-58 showed that location of heteroatoms in this IFR structure depends on the type of heteroatom. The combination of the pyridine and CO adsorption allowed determination of the concentration of hydroxyls in the 12- and 5/6-rings. Both Fe and Al are generating hydroxyls pointing towards either 12-ring or 5/6-rings but the former are located in positions giving Si?OH?Fe hydroxyls pointing mainly to the 12-rings while the latter gives rise to the Si?OH?Algroups pointing primarily to the narrower 5- and 6-rings. (Al)MCM-58 undergoes only minor dehydroxylation associated with the acid sites even at temperatures as high as 700 °C, which indicates unique stabilization of Al atoms in the IFR structure. In the case of (Fe)MCM-58, dehydroxylation is more extensive. Furthermore the OH located in the 5/6-rings dehydroxylate at lower temperatures than those in the 12-rings. The study also demonstrates that the concentration of the framework and e

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

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

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

Název periodika

Microporous and Mesoporous Materials

ISSN

1387-1811

e-ISSN

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Svazek periodika

151

Číslo periodika v rámci svazku

MAR 2012

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

339-345

Kód UT WoS článku

000300747000044

EID výsledku v databázi Scopus

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