Pd-PVP colloid as catalyst for Heck and carbonylation reactions:: TEM and XPS studies

被引：231

作者：

Gniewek, A

Trzeciak, AM

Ziólkowski, JJ

Kepinski, L

Wrzyszcz, J

Tylus, W

机构：

[1] Univ Wroclaw, Fac Chem, PL-50383 Wroclaw, Poland

[2] Polish Acad Sci, Inst Low Temp & Struct Res, PL-50950 Wroclaw, Poland

[3] Wroclaw Univ Technol, Inst Inorgan Technol, PL-50370 Wroclaw, Poland

来源：

JOURNAL OF CATALYSIS | 2005年 / 229卷 / 02期

关键词：

Pd-PVP colloid; Heck reactions methoxycarbonylation; XPS; TEM; redispersion of Pd;

D O I：

10.1016/j.jcat.2004.11.003

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 Phl 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 = 1, Br) and [Bu4N]X (X = Cl, Br, 1). The biggest shift of the center of nanoparticle size distribution, from 19.8 run to 7.6 nm, was found when Pd-PVP reacted with Phl and [Bu4N]Br. The formation of [Bu4N](2)[Pd(Ph)Br-3]- and [Bu4N](2)[PdBr4]-type complexes in that system was evidenced by XPS and UV-vis spectra. (C) 2004 Elsevier Inc. All rights reserved.

引用

页码：332 / 343

页数：12

共 43 条

[21]

Gürtler C, 1999, CHEM-EUR J, V5, P3107, DOI 10.1002/(SICI)1521-3765(19991105)5:11<3107::AID-CHEM3107>3.0.CO

[22]

2-#

[23] Heterogeneous Heck reaction catalyzed by Pd/C in ionic liquid [J].