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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F08%3A00315585%21RIV10-AV0-61388955
rdf:type
n11:Vysledek skos:Concept
dcterms:description
Two novel zeolites SSZ-33 and SSZ-35 were investigated with respect to their acidic properties using different probe molecules to characterize the accessibility and acid strength of Lewis and Bronsted acid sites. Ammonia, pyridine, pivalonitrile, and acetonitrile-d(3) were used as probe molecules, and the results were correlated with Al-27 and H-1 magic angle spinning NMR. Both SSZ-33 and SSZ-35 zeolites were found to possess bridging Si-OH-Al groups of virtually uniform and high acid strength. For both SSZ-33 and SSZ-35, there is the typical presence of highly disturbed OH groups (IR band around 3500 cm-1), which amounts to almost half of the overall Bronsted acidity. It was found that almost all bridging Si-OH-Al groups in SSZ-33 are located in the 12-MR rings. Both acetonitrile-d(3) and pyridine sorptions suggest the presence of two types of Lewis sites in SSZ-35, differing in acid strength and electron-acceptor properties, whereas in the SSZ-33 zeolite only one type is present. Two novel zeolites SSZ-33 and SSZ-35 were investigated with respect to their acidic properties using different probe molecules to characterize the accessibility and acid strength of Lewis and Bronsted acid sites. Ammonia, pyridine, pivalonitrile, and acetonitrile-d(3) were used as probe molecules, and the results were correlated with Al-27 and H-1 magic angle spinning NMR. Both SSZ-33 and SSZ-35 zeolites were found to possess bridging Si-OH-Al groups of virtually uniform and high acid strength. For both SSZ-33 and SSZ-35, there is the typical presence of highly disturbed OH groups (IR band around 3500 cm-1), which amounts to almost half of the overall Bronsted acidity. It was found that almost all bridging Si-OH-Al groups in SSZ-33 are located in the 12-MR rings. Both acetonitrile-d(3) and pyridine sorptions suggest the presence of two types of Lewis sites in SSZ-35, differing in acid strength and electron-acceptor properties, whereas in the SSZ-33 zeolite only one type is present.
dcterms:title
Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study
skos:prefLabel
Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study Acidic properties of SSZ-33 and SSZ-35 novel zeolites: a complex infrared and MAS NMR study
skos:notation
RIV/61388955:_____/08:00315585!RIV10-AV0-61388955
n4:aktivita
n10:Z n10:P
n4:aktivity
P(1QS400400560), P(GA104/07/0383), Z(AV0Z40400503)
n4:dodaniDat
n20:2010
n4:domaciTvurceVysledku
n8:7016662 n8:6503284 n8:2410044
n4:druhVysledku
n18:D
n4:duvernostUdaju
n6:S
n4:entitaPredkladatele
n9:predkladatel
n4:idSjednocenehoVysledku
354757
n4:idVysledku
RIV/61388955:_____/08:00315585
n4:jazykVysledku
n21:eng
n4:klicovaSlova
SSZ-33; SSZ-35; zeolites; acidity
n4:klicoveSlovo
n5:SSZ-35 n5:zeolites n5:SSZ-33 n5:acidity
n4:kontrolniKodProRIV
[A15315050FE0]
n4:mistoKonaniAkce
Paris
n4:mistoVydani
Oxford
n4:nazevZdroje
Zeolites and Related Materials: Trends, Targets and Challenges
n4:obor
n19:CF
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
6
n4:projekt
n16:1QS400400560 n16:GA104%2F07%2F0383
n4:rokUplatneniVysledku
n20:2008
n4:tvurceVysledku
Čejka, Jiří Voláková, Martina Gil, B. Žilková, Naděžda Zones, S. I. Hwang, S.-J.
n4:typAkce
n15:WRD
n4:zahajeniAkce
2008-09-01+02:00
n4:zamer
n12:AV0Z40400503
s:numberOfPages
6
n13:hasPublisher
Elsevier
n17:isbn
978-0-444-53297-8