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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F07%3A00085035%21RIV08-AV0-61388955
rdf:type
n10:Vysledek skos:Concept
dcterms:description
A novel bifunctional mesoporous material Nb,Sn-SBA-15 has been synthesized in one pot synthesis by in-situ introduction of niobium and tin salts and by controlling the synthesis conditions. These molecular sieves possess a high dispersion of both metals resulting in both the strong and weak acidic sites being simultaneously formed on SBA-15. Optimization of acid concentration in synthetic gels resulted in tuning of pore geometries while maintaining high structural regularity and in silica frameworks appropriate for catalytic applications were proved by UV-vis spectroscopy and catalytic reaction. Activity and selectivity of niobium/tincontaining mesoporous molecular sieves have been tested in liquid phase oxidation of cyclohexene. On the basis of this investigation, the new efficient NbSBA-15 catalyst prepared via conventional synthesis has been selected. Byl syntetizován nový mesoporézní materiál na bázi Nb,Sn-SBA-15 přimým přidáním Sn a Nb do reakční směsi. Tento katalyzátor vykazuje vysokou disperzitu obou kovů v křemičitanové matrici. Optimalizace reakčních podmínek umožnla tvorbu mesoporézního síta s velikostí porů až 14 nm. Koordinace atomů byla studována pomocí UV-VIS a katalytických testů při oxidaci cyklohexenu v kapalné fázi. Podařilo se připravit nový typ katalyzátoru s vysokou oxidační aktivitou. A novel bifunctional mesoporous material Nb,Sn-SBA-15 has been synthesized in one pot synthesis by in-situ introduction of niobium and tin salts and by controlling the synthesis conditions. These molecular sieves possess a high dispersion of both metals resulting in both the strong and weak acidic sites being simultaneously formed on SBA-15. Optimization of acid concentration in synthetic gels resulted in tuning of pore geometries while maintaining high structural regularity and in silica frameworks appropriate for catalytic applications were proved by UV-vis spectroscopy and catalytic reaction. Activity and selectivity of niobium/tincontaining mesoporous molecular sieves have been tested in liquid phase oxidation of cyclohexene. On the basis of this investigation, the new efficient NbSBA-15 catalyst prepared via conventional synthesis has been selected.
dcterms:title
Exploring the catalytic activity of regular and ultralarge-pore Nb,Sn-SBA-15 mesoporous molecular sieves Exploring the catalytic activity of regular and ultralarge-pore Nb,Sn-SBA-15 mesoporous molecular sieves Výzkum katalytické aktivity na bázi Nb,Sn-SBA-15 mesoporézních molekulových sít
skos:prefLabel
Exploring the catalytic activity of regular and ultralarge-pore Nb,Sn-SBA-15 mesoporous molecular sieves Výzkum katalytické aktivity na bázi Nb,Sn-SBA-15 mesoporézních molekulových sít Exploring the catalytic activity of regular and ultralarge-pore Nb,Sn-SBA-15 mesoporous molecular sieves
skos:notation
RIV/61388955:_____/07:00085035!RIV08-AV0-61388955
n3:strany
1432;1437
n3:aktivita
n13:R n13:P n13:Z
n3:aktivity
P(1ET400400413), P(FT-TA/040), R, Z(AV0Z40400503)
n3:cisloPeriodika
-
n3:dodaniDat
n5:2008
n3:domaciTvurceVysledku
n4:6964788 n4:7016662
n3:druhVysledku
n14:J
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
421350
n3:idVysledku
RIV/61388955:_____/07:00085035
n3:jazykVysledku
n7:eng
n3:klicovaSlova
mesoporous molecular sieves; ultralerge-pore; Nb,Sn-SBA-15
n3:klicoveSlovo
n12:mesoporous%20molecular%20sieves n12:Nb n12:Sn-SBA-15 n12:ultralerge-pore
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[9D8176C333DC]
n3:nazevZdroje
Studies in Surface Science and Catalysis
n3:obor
n17:CF
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:projekt
n16:FT-TA%2F040 n16:1ET400400413
n3:rokUplatneniVysledku
n5:2007
n3:svazekPeriodika
170
n3:tvurceVysledku
Čejka, Jiří Feliczak, A. Nekoksová, Iveta Tomczak, A. Nowak, I.
n3:zamer
n11:AV0Z40400503
s:issn
0167-2991
s:numberOfPages
6