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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F06%3A00044451%21RIV07-AV0-61388955
rdf:type
n11:Vysledek skos:Concept
dcterms:description
Byly vyvinuty nové typy heterogenních katalyzátorů pro metathesi alkenů, založené na oxidu molybdenovém naneseném na mesoporesních molekulových sítech MCM-41, MCM-48 a SBA-15. Tyto nové systémy představují levné, snadno připravitelné a vysoce aktivní a selektivní heterogenní katalyzátory pro metathese lineárních alkenů použitelné za mírných reakčních podmínek bez nutnosti použití rozpouštědla nebo kokatalyzátoru. Ve srovnání s oxidem molybdenovým naneseným na konveční silice vykázaly tyto katalyzátory v metathesi 1-oktenu značně vyšší aktivitu se selektivitou v rozmezí od 60 % do 90 %. Nejvyšší aktivitu poskytl katalyzátor MoO3/MCM-41 se šesti váhovými procenty Mo (konverze 75 % po šesti hodinách při teplotě 40 oC se selektivitou na 7-tetradecen 84 %). Turn-over frekvence katalyzátorů s loadingem 8 váhových procent Mo klesala v pořadí MCM-41 > MCM-48 > SBA-15, zatímco selektivita v uvedeném pořadí mírně rostla. New types of heterogeneous catalysts for alkene metathesis based on molybdenum oxide supported on mesoporous molecular sieves MCM-41, MCM-48 and SBA-15 were developed. These new systems represent inexpensive, easy-to-prepare and highly active and selective heterogeneous catalysts for metathesis of linear alkenes applicable under mild reaction conditions without the necessity of solvent or co-catalyst presence in the reaction mixture. In metathesis of 1-octene, these catalysts showed considerably higher activity compared with MoO3 supported on conventional silica with selectivity to 7-tetradecene being in the range between 60% and 95%. The highest activity exhibited MoO3/MCM-41 with 6 wt.% of Mo (75% conversion after 6 h at 40 oC with selectivity to 7-tetradecene 84%). The turn-over-frequency of the catalysts loaded with 8 wt.% of Mo decreased in the order MCM-41 > MCM-48 > SBA-15, while the selectivity slightly increased in the same order. New types of heterogeneous catalysts for alkene metathesis based on molybdenum oxide supported on mesoporous molecular sieves MCM-41, MCM-48 and SBA-15 were developed. These new systems represent inexpensive, easy-to-prepare and highly active and selective heterogeneous catalysts for metathesis of linear alkenes applicable under mild reaction conditions without the necessity of solvent or co-catalyst presence in the reaction mixture. In metathesis of 1-octene, these catalysts showed considerably higher activity compared with MoO3 supported on conventional silica with selectivity to 7-tetradecene being in the range between 60% and 95%. The highest activity exhibited MoO3/MCM-41 with 6 wt.% of Mo (75% conversion after 6 h at 40 oC with selectivity to 7-tetradecene 84%). The turn-over-frequency of the catalysts loaded with 8 wt.% of Mo decreased in the order MCM-41 > MCM-48 > SBA-15, while the selectivity slightly increased in the same order.
dcterms:title
Metathese 1-oktenu na oxidu molybdenovém naneseném na mesoporesních molekulových sítech: vliv architektury nosiče Metathesis of 1-octene over MoO3 supported on mesoporous molecular sieves: The influence of the support architecture Metathesis of 1-octene over MoO3 supported on mesoporous molecular sieves: The influence of the support architecture
skos:prefLabel
Metathese 1-oktenu na oxidu molybdenovém naneseném na mesoporesních molekulových sítech: vliv architektury nosiče Metathesis of 1-octene over MoO3 supported on mesoporous molecular sieves: The influence of the support architecture Metathesis of 1-octene over MoO3 supported on mesoporous molecular sieves: The influence of the support architecture
skos:notation
RIV/61388955:_____/06:00044451!RIV07-AV0-61388955
n3:strany
44;54
n3:aktivita
n15:P n15:Z
n3:aktivity
P(GD203/03/H140), P(IAA4040411), Z(AV0Z40400503)
n3:cisloPeriodika
1-3
n3:dodaniDat
n4:2007
n3:domaciTvurceVysledku
n8:6503284 n8:3040291 n8:7016662 n8:4766350 n8:5120500
n3:druhVysledku
n13:J
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n7:predkladatel
n3:idSjednocenehoVysledku
485067
n3:idVysledku
RIV/61388955:_____/06:00044451
n3:jazykVysledku
n12:eng
n3:klicovaSlova
metathesis; 1-octene; mesoporous molecular sieves; molybdenum oxide; Raman spectroscopy
n3:klicoveSlovo
n10:molybdenum%20oxide n10:Raman%20spectroscopy n10:mesoporous%20molecular%20sieves n10:metathesis n10:1-octene
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[C121545EA3D0]
n3:nazevZdroje
Microporous and Mesoporous Materials
n3:obor
n17:CF
n3:pocetDomacichTvurcuVysledku
5
n3:pocetTvurcuVysledku
6
n3:projekt
n6:GD203%2F03%2FH140 n6:IAA4040411
n3:rokUplatneniVysledku
n4:2006
n3:svazekPeriodika
96
n3:tvurceVysledku
Čejka, Jiří Topka, Pavel Balcar, Hynek Verpoort, F. Rathouský, Jiří Žilková, Naděžda
n3:zamer
n16:AV0Z40400503
s:issn
1387-1811
s:numberOfPages
11