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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F11%3A00359005%21RIV12-AV0-61388955
rdf:type
n5:Vysledek skos:Concept
dcterms:description
Two types of MFI zeolitic materials with improved accessibility, hierarchical zeolites and hybrid ordered mesoporous materials are here compared in terms of textural, acidic and catalytic properties. In both cases, protozeolitic units were employed as starting building blocks, the growth of which was perturbed by a silanization agent (hierarchical ZSM-5) or controlled by assembling around surfactant micelles (hybrid ordered mesoporous material, HZM). Likewise, two standard samples (nanocrystalline ZSM-5 and Al-MCM-41) were used as reference. Nitrogen adsorption measurements confirmed the presence of a secondary porosity and a high share of non-microporous surface area in hierarchical ZSM-5, whereas no significant amount of micropores was detected in the hybrid HZM sample. However, 27Al MAS NMR measurements indicated that zeolitic fragments are present within the walls of the latter sample. Two types of MFI zeolitic materials with improved accessibility, hierarchical zeolites and hybrid ordered mesoporous materials are here compared in terms of textural, acidic and catalytic properties. In both cases, protozeolitic units were employed as starting building blocks, the growth of which was perturbed by a silanization agent (hierarchical ZSM-5) or controlled by assembling around surfactant micelles (hybrid ordered mesoporous material, HZM). Likewise, two standard samples (nanocrystalline ZSM-5 and Al-MCM-41) were used as reference. Nitrogen adsorption measurements confirmed the presence of a secondary porosity and a high share of non-microporous surface area in hierarchical ZSM-5, whereas no significant amount of micropores was detected in the hybrid HZM sample. However, 27Al MAS NMR measurements indicated that zeolitic fragments are present within the walls of the latter sample.
dcterms:title
Acidic and catalytic properties of hierarchical zeolites and hybrid ordered mesoporous materials assembled from MFI protozeolitic units Acidic and catalytic properties of hierarchical zeolites and hybrid ordered mesoporous materials assembled from MFI protozeolitic units
skos:prefLabel
Acidic and catalytic properties of hierarchical zeolites and hybrid ordered mesoporous materials assembled from MFI protozeolitic units Acidic and catalytic properties of hierarchical zeolites and hybrid ordered mesoporous materials assembled from MFI protozeolitic units
skos:notation
RIV/61388955:_____/11:00359005!RIV12-AV0-61388955
n5:predkladatel
n18:ico%3A61388955
n3:aktivita
n6:Z
n3:aktivity
Z(AV0Z40400503)
n3:cisloPeriodika
2
n3:dodaniDat
n9:2012
n3:domaciTvurceVysledku
n15:7016662 n15:4492803
n3:druhVysledku
n14:J
n3:duvernostUdaju
n8:S
n3:entitaPredkladatele
n19:predkladatel
n3:idSjednocenehoVysledku
184448
n3:idVysledku
RIV/61388955:_____/11:00359005
n3:jazykVysledku
n16:eng
n3:klicovaSlova
hierarchical zeolites; hybrid zeolitic-mesostructured materials; Bronsted and Lewis acid centres
n3:klicoveSlovo
n11:Bronsted%20and%20Lewis%20acid%20centres n11:hierarchical%20zeolites n11:hybrid%20zeolitic-mesostructured%20materials
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[554318535A56]
n3:nazevZdroje
Journal of Catalysis
n3:obor
n7:CF
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
6
n3:rokUplatneniVysledku
n9:2011
n3:svazekPeriodika
279
n3:tvurceVysledku
Čejka, Jiří Vicente, G. Linares, M. García, R. A. Serrano, D. P. Procházková, Dana
n3:wos
000289919800015
n3:zamer
n10:AV0Z40400503
s:issn
0021-9517
s:numberOfPages
15
n17:doi
10.1016/j.jcat.2011.02.007