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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F07%3A00090513%21RIV08-AV0-61388955
rdf:type
skos:Concept n17:Vysledek
dcterms:description
eolites are crystalline microporous aluminosilicates widely used as molecular sieves and catalysts in industrial chemical processes. Silicon-rich zeolites (Si/Al>12) such as ZSM-5 (MFI framework) have found particular attention. The catalytically active species, that is, protons, metal cations, and metal-oxo cations, compensate the negative charge of the microporous aluminosilicate frameworks [Sin-mAlmO2n]m- made of corner-sharing TO4 tetrahedra (T=Si, Al-). A typical feature of many silicon-rich zeolites is a high number of crystallographically distinguishable T sites. Since the cationic species bind to the AlO4- tetrahedra, the crystallographic position of aluminum in zeolite frameworks governs the location of the active sites, which in turn affects the catalytic activity and selectivity. Zeolity jsou krystalické mikroporézní materiály široce používané jako molekulární síta a katalyzátory v průmyslových chemických procesech. Zejména křemíkem bohaté zeolity (Si/Al>12) jako ZSM-5 (MFI skelet) přitáhly pozornost. Katalyticky aktivní species, to jest protony, kationty kovů a kov-oxid kovu kationty kompenzují negativní náboj mikroporézního hliníko-křemíkového skeletu [Sin-mAlmO2n]m- které jsou tvořené rohy sdílejícími TO4 tetrahedry (T=Si, Al-). Typickým rysem mnoha křemíkem bohatých zeolitů je vysoký počet krystalograficky rozlišitelných T posicí. Neboť kationické species se vážou k AlO4- tetraedrům, krystalografická posice hliníku v zeolitickém skeletu určuje lokalizaci aktivních species. eolites are crystalline microporous aluminosilicates widely used as molecular sieves and catalysts in industrial chemical processes. Silicon-rich zeolites (Si/Al>12) such as ZSM-5 (MFI framework) have found particular attention. The catalytically active species, that is, protons, metal cations, and metal-oxo cations, compensate the negative charge of the microporous aluminosilicate frameworks [Sin-mAlmO2n]m- made of corner-sharing TO4 tetrahedra (T=Si, Al-). A typical feature of many silicon-rich zeolites is a high number of crystallographically distinguishable T sites. Since the cationic species bind to the AlO4- tetrahedra, the crystallographic position of aluminum in zeolite frameworks governs the location of the active sites, which in turn affects the catalytic activity and selectivity.
dcterms:title
Pozice hliníku v zeolitickém skeletu: ALNMR spektroskopie a kvantová mechanika/studie molekulární mechaniky na ZSM-5 Aluminum siting in silicon-rich zeolite frameworks: A combined high-resolution Al-27 NMR spectroscopy and quantum mechanics/molecular mechanics study of ZSM-5 Aluminum siting in silicon-rich zeolite frameworks: A combined high-resolution Al-27 NMR spectroscopy and quantum mechanics/molecular mechanics study of ZSM-5
skos:prefLabel
Aluminum siting in silicon-rich zeolite frameworks: A combined high-resolution Al-27 NMR spectroscopy and quantum mechanics/molecular mechanics study of ZSM-5 Aluminum siting in silicon-rich zeolite frameworks: A combined high-resolution Al-27 NMR spectroscopy and quantum mechanics/molecular mechanics study of ZSM-5 Pozice hliníku v zeolitickém skeletu: ALNMR spektroskopie a kvantová mechanika/studie molekulární mechaniky na ZSM-5
skos:notation
RIV/61388955:_____/07:00090513!RIV08-AV0-61388955
n3:strany
7286;7289
n3:aktivita
n7:Z n7:P
n3:aktivity
P(1ET400400413), P(GA203/06/1449), P(IAA4040308), Z(AV0Z40400503)
n3:cisloPeriodika
38
n3:dodaniDat
n9:2008
n3:domaciTvurceVysledku
Li, Chengbin n12:8208530 n12:9628983 n12:2980312 n12:5630134
n3:druhVysledku
n10:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
409193
n3:idVysledku
RIV/61388955:_____/07:00090513
n3:jazykVysledku
n14:eng
n3:klicovaSlova
MQ MAS NMR; chemical-shifts; ab-initio; catalysts
n3:klicoveSlovo
n5:chemical-shifts n5:MQ%20MAS%20NMR n5:ab-initio n5:catalysts
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[A0DAC174AE3C]
n3:nazevZdroje
Angewandte Chemie. International Edition in English
n3:obor
n16:CF
n3:pocetDomacichTvurcuVysledku
5
n3:pocetTvurcuVysledku
7
n3:projekt
n4:GA203%2F06%2F1449 n4:1ET400400413 n4:IAA4040308
n3:rokUplatneniVysledku
n9:2007
n3:svazekPeriodika
46
n3:tvurceVysledku
Sauer, J. Dědeček, Jiří Gábová, Vendula Li, Chengbin Sierka, M. Wichterlová, Blanka Sklenák, Štěpán
n3:zamer
n6:AV0Z40400503
s:issn
1433-7851
s:numberOfPages
4