Wydział Chemii

Andrzej Gniewek

Józef J. Ziółkowski

Anna M. Trzeciak

Mirosław Zawadzki

H. Grabowska

Józef Wrzyszcz

2008

Journal of Catalysis

254

121-130

10.1016/j.jcat.2007.12.004

Naukowa

Angielski

Artykuł

Alumina-based oxides Al₂O₃, Al₂O₃–ZrO₂ (A, B, C) and Al₂O₃–ZrO₂–Eu₂O₃ (D) were prepared by alkoxide sol–gel method and used as supports for palladium nanoparticles obtained by reduction of PdCl₂ by methanol or hydrazine. As confirmed by XRD and TEM methods, such catalysts are composed of palladium nanoparticles well dispersed on the surface of the alumina matrix. The Suzuki coupling of 2-bromotoluene with phenylboronic acid, used as the test reaction, revealed that the obtained catalysts were quite efficient even at 40 °C and that their catalytic activity increased at 60 and 80 °C. Very good results (95% yield after 1 h) also were obtained when PdCl₂ supported on mixed oxides was used without earlier palladium reduction. It was confirmed that under the reaction conditions, Pd(0) nanoparticles of ca. 5 nm in diameter were formed on the support. Under the same conditions (ⁱPrOH + H₂O used as a solvent, KOH as a base), a Pd(0)/PVP colloid exhibited slightly lower catalytic activity.

Suzuki–Miyaura reaction, Nanostructured alumina–zirconia, palladium nanoparticles, Metal colloid, Supported palladium

https://doi.org/10.1016/j.jcat.2007.12.004

http://www.elsevier.com