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| rdf:type
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| Description
| - Bifunkční katalyzátory byly připraveny nanesením chemicky redukovaných palladiových nanočástic na bazické nosiče na bázi MCM-41. Tyto nosiče byly připraveny iontovou výměnou hliníkem dopovaných mesoporézních molekulových sít MCM-41 cesnými a draselnými ionty. Tato síta byla dopována hliníkem během syntézy i po syntéze ((Al)MCM-41, Al-grafted MCM-41). Pro porovnání byl připraven také palladiem modifikovaný iontově vyměněný zeolit Y a nebazické molekulové síto MCM-41. Všechny připravené katalyzátory byly testovány v Heckově reakci butylakrylátu s brombenzenem, při které vzniká butyl ester kyseliny skořicové. Katalyzátor Pd@ Cs+ (Al)MCM-41 a Pd@Cs+ Al-grafted MCM-41 měly nejvyžší konverzi, vyjádřeno pomocí turn over number a turn over frequency, z analogických katalyzátorů dříve publikovaných. Ovšem nejaktivnější systém byl dosažen kombinací nebazického katalyzátoru s bází octanem sodným s výtěžkem 33 % po 20 hodinách při 160 oC v N,N-dimethylacetamidu a přítomnosti 1 mol.% palladia. (cs)
- Bifunctional supported catalysts were prepared by grafting of chemically reduced palladium nanoparticles onto basic MCM-41 type solid supports. The supports were obtained by ion-exchange with Cs+ or K+ ions from both in-synthesis and post-synthesis Al-doped mesoporous molecular sieves MCM-41 (i.e. (Al)MCM-41 and Al-grafted MCM-41). For a comparison, Pd@Cs+-exchanged zeolite Y and the non-basic Pd@MCM-41 catalyst were also prepared. All supported catalysts were tested in Heck reaction of butyl acrylate and bromobenzene to give n-butyl cinnamate. Catalysts Pd@Cs+-(Al)MCM-41 and Pd@Cs+-Al-grafted MCM-41 proved to be superior to the analogous catalysts reported in the literature in terms of turnover number and turnover frequency. Most active, however, were catalytic systems obtained from combination of the simple, non-basic Pd@MCM-41 with an external base, which gave the coupling product in 33% after 20 h at 160oC in N,N-dimethylacetamide in the presence of sodium acetate ...
- Bifunctional supported catalysts were prepared by grafting of chemically reduced palladium nanoparticles onto basic MCM-41 type solid supports. The supports were obtained by ion-exchange with Cs+ or K+ ions from both in-synthesis and post-synthesis Al-doped mesoporous molecular sieves MCM-41 (i.e. (Al)MCM-41 and Al-grafted MCM-41). For a comparison, Pd@Cs+-exchanged zeolite Y and the non-basic Pd@MCM-41 catalyst were also prepared. All supported catalysts were tested in Heck reaction of butyl acrylate and bromobenzene to give n-butyl cinnamate. Catalysts Pd@Cs+-(Al)MCM-41 and Pd@Cs+-Al-grafted MCM-41 proved to be superior to the analogous catalysts reported in the literature in terms of turnover number and turnover frequency. Most active, however, were catalytic systems obtained from combination of the simple, non-basic Pd@MCM-41 with an external base, which gave the coupling product in 33% after 20 h at 160oC in N,N-dimethylacetamide in the presence of sodium acetate ... (en)
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| Title
| - The used of palladium nanoparticles supported on MCM-41 mesoporous molecular sieves in Heck reaction: A comparison of basic and neutral supports
- The used of palladium nanoparticles supported on MCM-41 mesoporous molecular sieves in Heck reaction: A comparison of basic and neutral supports (en)
- Použití palladiových nanočástic nanesených na mesoporézním molekulovém sítě MCM-41 v Heckově reakci: porovnání bazických a neutrálních nosičů (cs)
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| skos:prefLabel
| - The used of palladium nanoparticles supported on MCM-41 mesoporous molecular sieves in Heck reaction: A comparison of basic and neutral supports
- The used of palladium nanoparticles supported on MCM-41 mesoporous molecular sieves in Heck reaction: A comparison of basic and neutral supports (en)
- Použití palladiových nanočástic nanesených na mesoporézním molekulovém sítě MCM-41 v Heckově reakci: porovnání bazických a neutrálních nosičů (cs)
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| skos:notation
| - RIV/61388955:_____/07:00083517!RIV08-MSM-61388955
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| http://linked.open.../vavai/riv/strany
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
| - P(GA104/05/0192), P(LC06070), Z(AV0Z40400503)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/61388955:_____/07:00083517
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - bifunctional catalysts; supported catalysts; palladium; nanoparticles; MCM-41 (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Journal of Molecular Catalysis A-Chemical
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Čejka, Jiří
- Štěpnička, P.
- Demel, Jan
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| http://linked.open...n/vavai/riv/zamer
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| issn
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| number of pages
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