| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 50648 | Catalysis Communications | 2014 | 5 Pages |
•Dendrimer-stabilized bimetallic Pd/Au nanoparticles were prepared.•Particle size is controlled by dendrimer:metal ratio and dendrimeric scaffold.•The alloy structure was confirmed by UV–vis spectroscopy, XRPD and TEM imaging.•Immobilized Pd/Au nanoparticles are active catalysts in vinyl acetate synthesis.
The preparation, characterization and a novel application to vinyl acetate synthesis of dendrimer-stabilized Pd/Au nanoparticles are described. The nanoparticles were synthesized by co-precipitation of aqueous Pd2 +/Au3 + salt solutions with hydrazine in the presence of (poly)amidoamine (PAMAM)-based dendrimers functionalized with terminal ethylene glycol ethers. Characterization by transmission electron microscopy and UV–vis spectroscopy confirmed that alloyed Pd/Au nanoparticles with a mean diameter of 6.0 (± 1.2) to 10.4 (± 1.7) nm were formed. After nanoparticle immobilization onto a silica support and thermal dendrimer removal, the resulting materials are high active catalysts in ethylene acetoxylation to vinyl acetate monomer with a productivity of 2.1 kgVAM kgcat− 1 h− 1.
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