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Statements

Subject Item
n2:RIV%2F61389013%3A_____%2F14%3A00425217%21RIV14-GA0-61389013
rdf:type
n5:Vysledek skos:Concept
dcterms:description
In this contribution, we present the application potentiality of biaxial Q-shearing of 27Al 3QMAS NMR spectra in the analysis of structural defects of aluminium units in aluminosilicates. This study demonstrates that the combination of various shearing transformations of the recorded 27Al 3QMAS NMR spectra enables an understanding of the broadening processes of the correlation signals of disordered framework aluminosilicates, for which a wide distribution of 27Al MAS NMR chemical shifts and quadrupolar parameters (i.e., second-order quadrupolar splitting and quadrupole-induced chemical shifts) can be expected. By combining the suitably selected shearing transformation procedures, the mechanisms of the formation of local defects in aluminosilicate frameworks, including Al/Si substitution effects in the next-nearest neighbouring T-sites, variations in bond angles, and/or variations in the physicochemical nature of charge-balancing counter-ions, can be identified. The proposed procedure has been extensively tested on a range of model aluminosilicate materials (kyanite, γ-alumina, metakaolin, analcime, chabazite, natrolite, phillipsite, mordenite, zeolite A, and zeolite Y). In this contribution, we present the application potentiality of biaxial Q-shearing of 27Al 3QMAS NMR spectra in the analysis of structural defects of aluminium units in aluminosilicates. This study demonstrates that the combination of various shearing transformations of the recorded 27Al 3QMAS NMR spectra enables an understanding of the broadening processes of the correlation signals of disordered framework aluminosilicates, for which a wide distribution of 27Al MAS NMR chemical shifts and quadrupolar parameters (i.e., second-order quadrupolar splitting and quadrupole-induced chemical shifts) can be expected. By combining the suitably selected shearing transformation procedures, the mechanisms of the formation of local defects in aluminosilicate frameworks, including Al/Si substitution effects in the next-nearest neighbouring T-sites, variations in bond angles, and/or variations in the physicochemical nature of charge-balancing counter-ions, can be identified. The proposed procedure has been extensively tested on a range of model aluminosilicate materials (kyanite, γ-alumina, metakaolin, analcime, chabazite, natrolite, phillipsite, mordenite, zeolite A, and zeolite Y).
dcterms:title
Biaxial Q-shearing of 27Al 3QMAS NMR spectra: insight into the structural disorder of framework aluminosilicates Biaxial Q-shearing of 27Al 3QMAS NMR spectra: insight into the structural disorder of framework aluminosilicates
skos:prefLabel
Biaxial Q-shearing of 27Al 3QMAS NMR spectra: insight into the structural disorder of framework aluminosilicates Biaxial Q-shearing of 27Al 3QMAS NMR spectra: insight into the structural disorder of framework aluminosilicates
skos:notation
RIV/61389013:_____/14:00425217!RIV14-GA0-61389013
n5:predkladatel
n6:ico%3A61389013
n3:aktivita
n13:I n13:P
n3:aktivity
I, P(GA13-24155S), P(IAA400400904)
n3:cisloPeriodika
February–April
n3:dodaniDat
n4:2014
n3:domaciTvurceVysledku
n12:5021197 n12:2613549 n12:6354068
n3:druhVysledku
n16:J
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
5220
n3:idVysledku
RIV/61389013:_____/14:00425217
n3:jazykVysledku
n9:eng
n3:klicovaSlova
27Al 3QMAS NMR; biaxial shearing; zeolites
n3:klicoveSlovo
n11:27Al%203QMAS%20NMR n11:biaxial%20shearing n11:zeolites
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[868E934D6231]
n3:nazevZdroje
Solid State Nuclear Magnetic Resonance
n3:obor
n18:JN
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
5
n3:projekt
n7:GA13-24155S n7:IAA400400904
n3:rokUplatneniVysledku
n4:2014
n3:svazekPeriodika
57-58
n3:tvurceVysledku
Klein, Petr Brus, Jiří Urbanová, Martina Dědeček, Jiří Kobera, Libor
n3:wos
000331707800005
s:issn
0926-2040
s:numberOfPages
10
n15:doi
10.1016/j.ssnmr.2013.11.003