高分子/SiO_2双负载纳米钯催化加氢反应特性 Ⅰ.双负载纳米钯的制备与表征  

The Hydrogenation Catalysis of Nanosized Palladium Supported by Polymer/Silica Di-Supporter Ⅰ. Synthesis and Characterization of Nano-Palladium Supported by Polymer/Silica Di-Supporter

作　　者：刘引烽[1] 黄爱明[1] 陈静[1] 陈来[1] 华家栋[1] 

机构地区：[1]上海大学材料科学与工程学院,上海201800

出　　处：《上海大学学报（自然科学版）》2003年第4期307-312,共6页Journal of Shanghai University:Natural Science Edition

基　　金：上海市教委青年基金 (98QN54)资助项目

摘　　要：作者采用配位转化方法,成功地制备了高分子/二氧化硅双重负载的纳米钯催化剂.运用光学显微镜、扫描电镜及透射电镜对催化体系的表面形态、纳米钯粒子的分布及粒径进行了测定.结果表明,通过配位转化方法制备的钯粒子与没有高分子保护的钯粒子相比,其在SiO2表面呈良好的球形,尺寸较为均一.高分子在SiO2表面的包覆层厚度、高分子配位基与金属钯离子的比例等对钯粒子的尺寸分布及粒径大小均有影响.通过红外光谱对纳米钯微粒制备过程中高分子配位基团的结构测定,推测了其制备过程的原理.In this study, nanosized palladium catalysts supported by silica and polymers were prepared by the coordination transition method. The morphology and the size of palladium particles on the supporters were determined by optical microscope, scanning electron microscope (SEM) and transmission electron microscope (TEM). The layer thickness of the polymer covered on silica was evaluated by the ratio of polymer to silica. It implies that the critical ratio of polymer to silica to form a polymer monolayer on silica is related to the gyration diameter of the polymer. It has been found that the palladium particles prepared by coordination transition method were nanosized and uniformly distributed in a spherical shape while those supported by silica alone are not. The effects of the ratios of the polymer both to silica and to palladium on the distribution and size of palladium particles are discussed. Based on the chemical structure characterized by the IR spectrum, the formation mechanism of nanosized palladium particles is then suggested.

关 键 词：纳米催化剂 高分子金属配合物 配位转化 

分 类 号：O643[理学—物理化学]