摘要
合成了聚（乙烯基吡咯烷酮－苯乙烯）共聚物，并以此为保护剂，用蒽镁还原法在四氢呋喃中制备了Ｃｏ和Ｐｄ胶体．ＴＥＭ等测试结果表明，用该方法可以制备分布窄。
Poly(vinylpyrrolidone co styrene) protected cobalt metal colloid was prepared by anthracene magnesium reduction in THF at room temperature under the protection of nitrogen. The copolymer was synthesized by radical copolymerization of vinylpyrrolidone (NVP) with styrene (ST). From the elemental analysis, the mole ratio of NVP to ST was about 0 2, and the IR spectrum showed that the copolymer was composed of functional groups of the two monomers. TEM result indicated that the average particle size of the cobalt colloid was 1 48 nm with a standard deviation of 0 51 nm, and the electron diffraction pattern of the particles declared that they were amorphous phase. The XRD investigation showed that there was no obvious diffraction line of metallic cobalt or cobalt oxide , which was consistent with the result of electron diffraction. In order to verify the metal cobalt generation, the cobalt powder was prepared under the same condition as the colloid without protective copolymer. The cobalt particles immobilized on active carbon were served as catalyst for the selective hydrogenation of cinnamic aldehyde (CAL). Its TOF (defined as n CAL /( n Co · t )) was 9 2 mol/(mol·h) and the selectivity for cinnamic alcohol was over 90% at 20% conversion. The palladium colloid could be prepared by the same method.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1996年第3期241-244,共4页
基金
国家自然科学基金 中国科学院重点基金 中国科学院化学研究所所长基金
关键词
钴金属胶体
蒽镁
高分子保护有机溶胶
Cobalt metal colloid, Anthracene magnesium, Polymer protected organosol
