Colloidal platinum nanoparticles stabilized by vinyl polymers with amide side chains: Dispersion stability and catalytic activity in aqueous electrolyte solutions

被引:42
作者
Chen, CW [1 ]
Tano, D [1 ]
Akashi, M [1 ]
机构
[1] Kagoshima Univ, Fac Engn, Dept Chem Engn & Appl Chem, Kagoshima 8900065, Japan
关键词
colloidal platinum nanoparticles; poly(N-vinylformamide); dispersion stability; catalyst; hydrogenation;
D O I
10.1006/jcis.2000.6731
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
Colloidal platinum nanoparticles were prepared by ethanol reduction of PtCl62- in the presence of poly(N-vinylformamide) (PNVF), poly(N-vinylacetamide) (PNVA), or poly(N-vinylisobutyramide) (PNVIBA). The effects of molecular weight and molar ratio of monomeric unit/Pt on the particle sizes and size distributions were characterized by transmission electron microscopy and UV-visible spectroscopy. The flocculation behavior of the polymer-stabilized colloidal Pt nanoparticles was studied with respect to the effects of temperature, addition of inorganic salts, and composition of the mixed solvents. The dispersion stability of the platinum colloids stabilized by poly(N'-isopropylacrylamide) (PNIPAAm) and poly(vinylpyrrolidone) (PVP) was also examined. The sequence of polymer-stabilized platinum colloids in increasing order of dispersion stability was found to be PNIPAAm-Pt < PNVIBA-Pt < PVP-Pt < PNVA-Pt < PNVF-Pt. Anions of the added salts played an essential role in reducing the dispersion stability and sulfates were more efficient at promoting flocculation than chlorides. The PNVF-Pt colloids did not show any critical flocculation point (temperature or salt concentration) under employed conditions, owing to the strongly hydrophilic nature of PNVF chains. The catalytic activity of PNVF-Pt colloids for hydrogenation of allyl alcohol in 0.8 M Na2SO4 solution was the same as that in pure water. (C) 2000 Academic Press.
引用
收藏
页码:349 / 358
页数:10
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