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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F07%3A00082441%21RIV08-AV0-61388955
rdf:type
n8:Vysledek skos:Concept
dcterms:description
Advanced heterogeneous catalysts for olefin metathesis were prepared by supporting Re(VII) oxide on (i) mesostructured gamma-aluminas with lathlike and scaffold-like morphologies and (ii) organized mesoporous alumina with wormhole-like pore structure. The thermal spreading method was found to be very suitable technique for preparation of a highly active catalyst. In the case of dec-1-ene metathesis, Re(VII) oxide catalysts supported on mesoporous aluminas exhibited a high activity and selectivity independently of the type of catalyst support. For metathesis of olefin functional derivatives, namely p-allylanisole and diethyl diallylmalonate, the activity of Re(VII) catalysts with optimum amount of Re(VII) being 9.0 wt% (with Me4Sn as co-catalyst) was found to depend on the catalyst pore size. Catalyst prepared from mesoporous aluminas with pore sizes at least 4.0 nm exhibited much higher conversions of substrates compared with catalysts of 3.5 nm pores. Advanced heterogeneous catalysts for olefin metathesis were prepared by supporting Re(VII) oxide on (i) mesostructured gamma-aluminas with lathlike and scaffold-like morphologies and (ii) organized mesoporous alumina with wormhole-like pore structure. The thermal spreading method was found to be very suitable technique for preparation of a highly active catalyst. In the case of dec-1-ene metathesis, Re(VII) oxide catalysts supported on mesoporous aluminas exhibited a high activity and selectivity independently of the type of catalyst support. For metathesis of olefin functional derivatives, namely p-allylanisole and diethyl diallylmalonate, the activity of Re(VII) catalysts with optimum amount of Re(VII) being 9.0 wt% (with Me4Sn as co-catalyst) was found to depend on the catalyst pore size. Catalyst prepared from mesoporous aluminas with pore sizes at least 4.0 nm exhibited much higher conversions of substrates compared with catalysts of 3.5 nm pores. Moderní heterogenní katalyzátory metateze olefinů byly připraveny nanesením oxidu rhenistého na (i) mesoporézní .nu.-aluminu s %22lath-like%22 a %22scaffold-like%22 morfologií a (ii) organisovanou mesoporézní aluminu s „wormhole-like“ strukturou. Nanesení provedené metodou teplotního rozestírání (thermal spreading) vedlo k přípravě velmi aktivních katalyzátorů. V případě metateze dec-1-enu, vykázaly tyto katalyzátory vysokou aktivitu a selektivitu nezávisle na typu použitého nosiče. V metatezi funkčních derivátů olefinů, jmenovitě p-allylanisolu a diethyldiallylmalonátu, aktivita těchto katalyzátorů (s optimálním obsahem Re = 9.0 vah.% a kokatalytickým přídavkem Me4Sn) závisela na velikosti póru katalyzátoru. Katalyzátory na nosičích o velikosti póru 4 nm a více, poskytly významně vyšší výtěžky metatezních produktů než katalyzátory o velikosti póru 3.5 nm.
dcterms:title
Re(VII) oxide on mesoporous alumina of different types - Activity in the metathesis of olefins and their oxygen-containing derivatives Oxid rhenistý nanesený na mesoporézní alumině různých typů – aktivita v metatezích olefinů a jejich kyslíkatých derivátů Re(VII) oxide on mesoporous alumina of different types - Activity in the metathesis of olefins and their oxygen-containing derivatives
skos:prefLabel
Oxid rhenistý nanesený na mesoporézní alumině různých typů – aktivita v metatezích olefinů a jejich kyslíkatých derivátů Re(VII) oxide on mesoporous alumina of different types - Activity in the metathesis of olefins and their oxygen-containing derivatives Re(VII) oxide on mesoporous alumina of different types - Activity in the metathesis of olefins and their oxygen-containing derivatives
skos:notation
RIV/61388955:_____/07:00082441!RIV08-AV0-61388955
n3:strany
56;63
n3:aktivita
n5:P n5:V n5:Z
n3:aktivity
P(FT-TA/042), P(IAA4040411), V, Z(AV0Z40400503)
n3:cisloPeriodika
-
n3:dodaniDat
n12:2008
n3:domaciTvurceVysledku
n4:4940717 n4:6503284 n4:7016662 n4:4766350
n3:druhVysledku
n7:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
447693
n3:idVysledku
RIV/61388955:_____/07:00082441
n3:jazykVysledku
n16:eng
n3:klicovaSlova
organized mesoporous alumina; metathesis; olefin functional derivatives; rhenium oxide
n3:klicoveSlovo
n14:metathesis n14:olefin%20functional%20derivatives n14:organized%20mesoporous%20alumina n14:rhenium%20oxide
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[85DEF93F380D]
n3:nazevZdroje
Applied Catalysis A - General
n3:obor
n13:CF
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
6
n3:projekt
n18:FT-TA%2F042 n18:IAA4040411
n3:rokUplatneniVysledku
n12:2007
n3:svazekPeriodika
320
n3:tvurceVysledku
Hamtil, Roman Čejka, Jiří Žilková, Naděžda Zhang, Z. Pinnavaia, T. J. Balcar, Hynek
n3:zamer
n17:AV0Z40400503
s:issn
0926-860X
s:numberOfPages
8