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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites
Original language description
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
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2012
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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