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Inne
Pd-PVP colloid as catalyst for Heck and carbonylation reactions: TEM and XPS studies.
Autorzy
Rok wydania
2005
Czasopismo
Numer woluminu
229
Strony
332-343
DOI
0.1016/j.jcat.2004.11.003
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Pd-PVP colloid (stabilized with polyvinylpyrrolidone) with a diameter of 19.8 nm in [Bu4N]Br medium catalyzes Heck coupling of bromobenzene with butyl acrylate and methoxycarbonylation of iodobenzene reactions. Oxidative addition of PhI or PhBr to Pd-PVP as the first step of a catalytic reaction was confirmed by TEM and XPS measurements. TEM studies showed significant reduction of Pd nanoparticle size after their reaction with PhX (X = I, Br) and [Bu4N]X (X = Cl, Br, I). The biggest shift of the center of nanoparticle size distribution, from 19.8 nm to 7.6 nm, was found when Pd-PVP reacted with PhI and [Bu4N]Br. The formation of [Bu4N]2[Pd(Ph)Br3]- and [Bu4N]2[PdBr4]-type complexes in that system was evidenced by XPS and UV–vis spectra.
Słowa kluczowe
Pd-PVP colloid, Heck reaction, Methoxycarbonylation, XPS, TEM, Redispersion of Pd
Adres publiczny
https://doi.org/10.1016/j.jcat.2004.11.003
Strona internetowa wydawcy
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