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Wyszukujesz frazę "hydrogenation reaction" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Magnetic recykling of complex catalysts immobilized on thiol-functionalized polymer supports
Autorzy:
Bączek, N
Strzelec, K.
Wąsikowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/779554.pdf
Data publikacji:
2013
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
encapsulation
magnetic recycling
epoxy resin
supported catalysts
Heck reaction
hydrogenation reaction
Opis:
In this work, the application of the thiol-functionalized epoxy resin encapsulated on magnetic core as supports for palladium catalysts is reported. The study focuses on obtaining of heterogeneous catalysts which can be separated by magnetic field. Palladium complex catalyst [PdCl2(PhCN)2] has been heterogenized by anchoring to these supports via ligand exchange reaction. The characterization of polymeric supports and heterogenized palladium catalysts has involved research methods like time-of-flight secondary ion mass spectrometry (TOF-SIMS), scanning electron microscopy (SEM) and nitrogen BET surface area measurements. The activity and stability during long-term use of the investigated catalytic systems were tested in a Heck and hydrogenation reaction. The influence of the type of thiols used as epoxy hardeners and the morphology of the supports on the catalytic properties of epoxy-supported palladium catalysts was discussed.
Źródło:
Polish Journal of Chemical Technology; 2013, 15, 3; 65-68
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Screening of the catalytic activity of pd0 and pd2+- supported on chitosan beads and cryogels
Autorzy:
Pestov, Aleksandr
Mekhaev, Aleksandr
Privar, Yuliya
Prokuda, Natalya
Modin, Evgeniy
Bratskaya, Svetlana
Powiązania:
https://bibliotekanauki.pl/articles/1034532.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
Heck reaction
catalysis
chitosan
cryogel
hydrodechlorination
hydrogenation
Opis:
Here, we report the results of screening of the catalytic activity of Pd-containing chitosan beads and cryogels in the cross-coupling reaction, hydrogenation of alkenes, nitro-, and carbonyl compounds and the hydrodechlorination of chlorophenols. Pd0-containing chitosan beads and cryogels show moderate catalytic activity in the reduction of alkenes and nitroaromatics. The conversion of nitroaromatics decreases for substrates with electron-withdrawing substituents, while the conversion of alkenes increases with the activation of carbon-carbon double bonds. For several substrates, a significant difference in kinetics and conversion degrees was observed for Pd nanoparticles supported on chitosan beads and cryogels. It was found that conversion in the hydrodechlorination reaction depends on substrate structure, being higher for substrates containing substituents with a positive mesomeric effect. Pd2+-chitosan catalysts showed high catalytic activity in cross-coupling (Heck reaction) offering the following advantages over known catalytic systems: lower reaction temperature, the selective functionalisation of C-I bonds, and the possibility to perform reactions with iodobenzene without base addition.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 149-158
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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