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

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About: On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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–Al groups 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 extraframework iron atoms can be determined by a simple method based on pyridine adsorption followed by IR spectroscopy. 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–Al groups 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 extraframework iron atoms can be determined by a simple method based on pyridine adsorption followed by IR spectroscopy. (en)
Title	On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites (en)
skos:prefLabel	On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites On the location of iron and aluminium atoms in thermally activated AlMCM-58 and FeMCM-58 zeolites (en)
skos:notation	RIV/61388955:_____/12:00375929!RIV13-GA0-61388955
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GAP106/11/0819), P(GD203/08/H032), Z(AV0Z40400503)
http://linked.open...iv/cisloPeriodika	MAR 2012
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Kubů, Martin Čejka, Jiří
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...dnocenehoVysledku	156425
http://linked.open...ai/riv/idVysledku	RIV/61388955:_____/12:00375929
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	MCM-58; heteroatom location; IR, EPR and NMR spectroscopy (en)
http://linked.open.../riv/klicoveSlovo	IR EPR and NMR spectroscopy MCM-58 heteroatom location
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[E64476308DBA]
http://linked.open...i/riv/nazevZdroje	Microporous and Mesoporous Materials
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	6 (xsd:int)
http://linked.open...vavai/riv/projekt	Understanding and controlling the location of acid sites in zeolites for their catalytic applications Advanced catalytic processes and materials
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	151
http://linked.open...iv/tvurceVysledku	Kubů, Martin Čejka, Jiří Adamski, A. Gil, B. Marszalek, B. Olejniczak, Z.
http://linked.open...ain/vavai/riv/wos	000300747000044
http://linked.open...n/vavai/riv/zamer	Struktura, reaktivita a dynamika molekulárních a biomolekulárních systémů: teorie, experiment, aplikace
issn	1387-1811
number of pages	7 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.micromeso.2011.10.014

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