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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F10%3A00437171%21RIV15-GA0-61388955
rdf:type
n14:Vysledek skos:Concept
dcterms:description
The effect of synthesis conditions on the preparation and properties of three novel zeolites TUN, IMF, and -SVR was investigated and compared with MFI. X-ray powder diffraction, infrared spectroscopy, chemical analysis, sorption measurements, and scanning electron microscopy were employed to characterize the textural and chemical properties of these zeolites. FTIR spectroscopy in combination with pyridine as probe molecule was used to describe the type, concentration and acid strength of these zeolites. Zeolite -SVR was synthesized with Si/Al ratios higher than 100 in contrast with TUN and IMF having Si/Al ratios about 20-30, respectively. TUN, MFI and IMF zeolites exhibit similar concentrations of Bronsted and Lewis acid sites and also similar acid strength of Bronsted sites. In contrast, the presence of one vacancy/unit cell in the case of -SVR zeolite substantially changes its acidic properties. Generally, zeolites TUN and IMF exhibit similar acidic properties in terms of acid strength and Bronsted to Lewis acid site ratio like MFI and due to their slightly larger pores higher activities in catalytic reactions are expected. The effect of synthesis conditions on the preparation and properties of three novel zeolites TUN, IMF, and -SVR was investigated and compared with MFI. X-ray powder diffraction, infrared spectroscopy, chemical analysis, sorption measurements, and scanning electron microscopy were employed to characterize the textural and chemical properties of these zeolites. FTIR spectroscopy in combination with pyridine as probe molecule was used to describe the type, concentration and acid strength of these zeolites. Zeolite -SVR was synthesized with Si/Al ratios higher than 100 in contrast with TUN and IMF having Si/Al ratios about 20-30, respectively. TUN, MFI and IMF zeolites exhibit similar concentrations of Bronsted and Lewis acid sites and also similar acid strength of Bronsted sites. In contrast, the presence of one vacancy/unit cell in the case of -SVR zeolite substantially changes its acidic properties. Generally, zeolites TUN and IMF exhibit similar acidic properties in terms of acid strength and Bronsted to Lewis acid site ratio like MFI and due to their slightly larger pores higher activities in catalytic reactions are expected.
dcterms:title
TUN, IMF and-SVR zeolites; synthesis, properties and acidity TUN, IMF and-SVR zeolites; synthesis, properties and acidity
skos:prefLabel
TUN, IMF and-SVR zeolites; synthesis, properties and acidity TUN, IMF and-SVR zeolites; synthesis, properties and acidity
skos:notation
RIV/61388955:_____/10:00437171!RIV15-GA0-61388955
n4:aktivita
n11:Z n11:P
n4:aktivity
P(GA203/08/0604), P(GD203/08/H032), Z(AV0Z40400503)
n4:cisloPeriodika
19-20
n4:dodaniDat
n5:2015
n4:domaciTvurceVysledku
n9:7350678 n9:7016662
n4:druhVysledku
n16:J
n4:duvernostUdaju
n10:S
n4:entitaPredkladatele
n8:predkladatel
n4:idSjednocenehoVysledku
293738
n4:idVysledku
RIV/61388955:_____/10:00437171
n4:jazykVysledku
n19:eng
n4:klicovaSlova
novel zeolites; diquats; TUN
n4:klicoveSlovo
n7:TUN n7:diquats n7:novel%20zeolites
n4:kodStatuVydavatele
NL - Nizozemsko
n4:kontrolniKodProRIV
[728240C22F0F]
n4:nazevZdroje
Topics in Catalysis
n4:obor
n12:CF
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
3
n4:projekt
n18:GA203%2F08%2F0604 n18:GD203%2F08%2FH032
n4:rokUplatneniVysledku
n5:2010
n4:svazekPeriodika
53
n4:tvurceVysledku
Kubů, Martin Čejka, Jiří Zones, S. I.
n4:wos
000283584800007
n4:zamer
n13:AV0Z40400503
s:issn
1022-5528
s:numberOfPages
10
n3:doi
10.1007/s11244-010-9591-8