摘要
近年来高分子保护金属胶体的研究在金属催化剂领域中受到人们的突出关注。自Hirai等人对聚乙烯吡咯烷酮保护的铂族金属胶体的系统研究工作发表之后,一项重要的研究进展是双金属胶体的制备成功。当前制备窄分布乃至单分散胶体的努力成为众多研究的集中目标,具有重要的理论意义和实际应用价值。Bradley等报道用金属蒸汽冷凝至含有高分子稳定剂的有机溶剂中制备得到2.0—5.0nm直径的金属胶体,Schmid等报道用水溶性三苯膦磺酸钠小分子配位体作为稳定剂制备得到直径为18.6±0.1nm的金胶体。Esumi等用在有机溶剂中热解乙酸钯的方法制备得到不同粒径的均一球形的钯金属胶体。
The N-substituted polyacrylamide containing aclicyclic amino rings, such as: poly-N-acryloyl-N'-methylpiperazine, poly-N-acryloyl-morpholine, poly-N-acryloyl-pyrrolidone, poly-N-acryloyl-piperidine, were examined as the protective polymers for the formation of the precious metal colloids. It was found that in the presence of poly-N-acryloyl-morpholine stable metallic colloids with fine particle size and narrow dispersion of palladium, rhodium, platinum, ruthenium and silver were formed by means of alcohol reduction in a methanol-water mixed solvent system. TEM measurements illustrated that in poly-N-acryloyl-N'-methylpipe-razine protective system, palladium colloid was mostly distributed in the range of 1.5-2.0 nm with an average diameter of 1.6 nm; in poly-N-acryloyl-morpholine protective system, palladium colloid was in the range of 2.0-3.0 nm with an average diameter of 2.5 nm, rhodium colloid was in the range of 1.6-2.5 nm with an average diameter of 2.3 nm. Palladium, platinum and rhodium colloids formed were also surveyed as catalysts for hydrogenation of cy-clooctadiene.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1993年第1期105-108,共4页
Acta Polymerica Sinica
基金
国家自然科学基金
中国科学院上海有机化学研究所金属有机化学开放实验室
关键词
聚丙烯酰胺
贵金属胶体
脂肪环胺
Polyacrylamides, Polymer protected metallic colloid, Nobel metal colloids, Platinum metals colloids
