Colloidal dispersions of poly(N-vinyl-2-pyrrolidone) (PVP)-stabilized ruthenium-platinum and ruthenium-palladium bimetallic colloids were prepared by NaBH 4 reduction of the corresponding mixedmetal salts at room temperature and characterized by TEM, XPS, and XRD. The resulting bimetallic colloids w
Preparation, Characterization, and Catalytic Properties of Polymer-Stabilized Ruthenium Colloids
β Scribed by Weiyong Yu; Manhong Liu; Hanfan Liu; Xiaoming Ma; Zhijie Liu
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 439 KB
- Volume
- 208
- Category
- Article
- ISSN
- 0021-9797
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β¦ Synopsis
Poly(N-vinyl-2-pyrrolidone) (PVP)-stabilized ruthenium colloids were prepared by NaBH 4 reduction at room temperature and characterized by transmission electron microscopy and x-ray photoelectron spectra. The average diameters of the colloids were 1.3-1.8 nm with β«Ψβ¬ 0.4 -0.7 nm with respect to the preparation conditions. The PVP-stabilized ruthenium colloids were used as catalysts in the hydrogenations of cyclooctene and n-heptene and the selective hydrogenation of citronellal to citronellol.
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Several metal colloids stabilized by an amphiphilic copolymer, poly(1-vinylpyrrolidone-co-acrylic acid) (abbreviated as PVPAA), were prepared by refluxing alcohol-water mixed solutions of the corresponding metal precursors. They had small particle sizes and narrow size distributions. Their catalytic
Polymer-stabilized noble metal colloids were efficiently immobilized on silica by the addition of organic acids under mild conditions. The function of organic acids in the immobilization was studied by infrared spectroscopy. Transmission electron micrographs indicate that the immobilized colloids ha