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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F07%3A00091838%21RIV08-AV0-61388955
rdf:type
n15:Vysledek skos:Concept
dcterms:description
V acylačních reakcí ferrocenu a toluenu byl zkoumán vliv typu kyselých center (Broenstedova vs. Lewisova) v různých molekulových sítech. Pro reakce byly použity H, Zn, Fe a Al formy zeolitů Beta, USY a mesoporézních molekulových sít (Al)MCM-41 a (Al) a SBA-15. Bylo zjištěno, že přidané kationy působící jako Lewisova kyselá centra zvyšují aktivitu testovaných katalyzátorů. Nebyl nalezen obecně platný vztah mezi typem kationtu a konverzí jednotlivých substrátů. V případě acylace ferrocenu byla nejvyšší aktivita pozorována u Zn-forem, zatímco při acylaci toluenu nejvyšší aktivity vykazovaly Al-formy testovaných molekulových sít. The role of the type of acid site (Broensted vs. Lewis) on the activity and selectivity of molecular sieve catalysts was investigated in ferrocene and toluene acylation. H-, Zn-, Fe-, Aland La-forms of zeolite Beta, USY and mesoporous molecular sieves (Al) MCM-41, (Al) SBA-15 were tested. It was observed that addition of metal cations acting as Lewis acid sites can increase the acidity of various molecular sieve catalysts. No general relationship between the type of cation and conversion of individual substrate was found. While the highest activity in ferrocene acylation was observed after addition of Zn, in the case of toluene acylation Al-forms of catalysts were the most active. The results indicate that the acid strength of cationic Lewis sites controls their activity in acylation reactions. The role of the type of acid site (Broensted vs. Lewis) on the activity and selectivity of molecular sieve catalysts was investigated in ferrocene and toluene acylation. H-, Zn-, Fe-, Aland La-forms of zeolite Beta, USY and mesoporous molecular sieves (Al) MCM-41, (Al) SBA-15 were tested. It was observed that addition of metal cations acting as Lewis acid sites can increase the acidity of various molecular sieve catalysts. No general relationship between the type of cation and conversion of individual substrate was found. While the highest activity in ferrocene acylation was observed after addition of Zn, in the case of toluene acylation Al-forms of catalysts were the most active. The results indicate that the acid strength of cationic Lewis sites controls their activity in acylation reactions.
dcterms:title
The effect of type of acid sites in molecular sieves on activity and selectivity in acylation reactions Vliv typu kyselých center molekulových sít na aktivitu a selektivitu acylačních reakcí The effect of type of acid sites in molecular sieves on activity and selectivity in acylation reactions
skos:prefLabel
Vliv typu kyselých center molekulových sít na aktivitu a selektivitu acylačních reakcí The effect of type of acid sites in molecular sieves on activity and selectivity in acylation reactions The effect of type of acid sites in molecular sieves on activity and selectivity in acylation reactions
skos:notation
RIV/61388955:_____/07:00091838!RIV08-AV0-61388955
n3:strany
728;746
n3:aktivita
n6:P n6:Z
n3:aktivity
P(GA104/07/0383), P(GD203/03/H140), Z(AV0Z40400503)
n3:cisloPeriodika
5-6
n3:dodaniDat
n13:2008
n3:domaciTvurceVysledku
n5:7016662 n5:6873170 n5:4492803 n5:2410044
n3:druhVysledku
n9:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
419171
n3:idVysledku
RIV/61388955:_____/07:00091838
n3:jazykVysledku
n12:eng
n3:klicovaSlova
molecular sieves; catalysis; zeolites
n3:klicoveSlovo
n7:zeolites n7:molecular%20sieves n7:catalysis
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[67E4CAF54A99]
n3:nazevZdroje
Collection of Czechoslovak Chemical Communications
n3:obor
n14:CF
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
5
n3:projekt
n16:GA104%2F07%2F0383 n16:GD203%2F03%2FH140
n3:rokUplatneniVysledku
n13:2007
n3:svazekPeriodika
72
n3:tvurceVysledku
Vlk, J. Bejblová, Martina Procházková, Dana Šiklová, Helena Čejka, Jiří
n3:zamer
n4:AV0Z40400503
s:issn
0010-0765
s:numberOfPages
19