一种用于电子转移反应的高效、可重复使用的二氧化硅/树枝状大分子负载铂催化剂。

An efficient and reusable silica/dendrimer supported platinum catalyst for electron transfer reactions.

机构信息

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou 350002, PR China.

出版信息

J Colloid Interface Sci. 2011 Jan 1;353(1):149-55. doi: 10.1016/j.jcis.2010.09.047. Epub 2010 Oct 12.

DOI:10.1016/j.jcis.2010.09.047

PMID:20943225

Abstract

A series of Pt nanoparticles (NPs) smaller than 3 nm were successfully encapsulated in dendrimer/SBA-15 organic and inorganic hybrid composite. The obtained catalysts were characterized by XPS, XRD and TEM. The results of XPS and XRD indicate the existence of Pt NPs in the hybrid matrix. TEM images display the Pt NPs with narrow size distribution are monodispersed in SBA-15 channels. Catalytic property of the supported Pt catalysts was investigated in inorganic (ferricyanide to ferrocyanide by thiosulfate) and organic (p-nitrophenol to p-aminophenol by sodium borohydride) electron transfer (redox) reactions. In both cases, the reduction reactions followed smoothly and the catalysts showed excellent catalytic activity. Moreover, the catalysts can be easily separated and reused several times preserving good catalytic performance.

摘要

一系列小于 3nm 的 Pt 纳米颗粒（NPs）成功地被包裹在树状大分子/SBA-15 有机-无机杂化复合材料中。所得到的催化剂通过 XPS、XRD 和 TEM 进行了表征。XPS 和 XRD 的结果表明 Pt NPs 存在于杂化基体中。TEM 图像显示 Pt NPs 具有较窄的尺寸分布，在 SBA-15 通道中呈单分散状态。负载型 Pt 催化剂的催化性能在无机（铁氰化物到亚铁氰化物通过硫代硫酸盐）和有机（对硝基苯酚到对氨基酚通过硼氢化钠）电子转移（氧化还原）反应中进行了研究。在这两种情况下，还原反应都进行得很顺利，催化剂表现出优异的催化活性。此外，催化剂可以很容易地分离并重复使用多次，保持良好的催化性能。