金纳米颗粒的限域生长及FeOx-Au@SiO2纳米结构的催化活性

项目名称： 金纳米颗粒的限域生长及FeOx-Au@SiO2纳米结构的催化活性

项目编号： No.51502298

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 一般工业技术

项目作者： 丁华霖

作者单位： 中国科学院合肥物质科学研究院

项目金额： 21万元

中文摘要： 本项目以金纳米颗粒（NPs）的限域生长及FeOx-Au@SiO2纳米结构与催化活性的关联为研究目标，利用表面洁净的蛋黄-蛋壳型Fe3O4@SiO2纳米结构作为纳米限域合成器，研究尺寸小于5nm的金NPs在氧化铁上的无配体生长技术，探讨空腔大小和SiO2壳层厚度与金NPs尺寸的关系，优化Au纳米颗粒的生长技术；以环己醇气相催化氧化为手段，研究氧化铁和金NPs的尺寸、空腔大小、SiO2壳层厚度及孔径与催化活性的关系，揭示FeOx/Au纳米颗粒的协同作用及其与催化活性的关联，优化FeOx-Au@SiO2纳米结构的催化活性。Fe3O4@SiO2纳米结构作为限域合成器，可以有效地控制金NPs的尺寸和避免配体的干扰，有助于揭示FeOx-Au复合结构的催化作用机制。本项目不仅可以深化对金NPs催化活性本质的认识，而且可以为高活性催化剂的设计和实现基于金NPs的“合成—保护—催化”的一体化奠定基础。

中文关键词： 蛋黄-蛋壳型结构；小尺寸Au纳米颗粒；纳米限域合成器；催化

英文摘要： The aim of this project is to realize the confinement growth of gold nanoparticlesand understand the relationship between FeOx-Au@SiO2 nanostructures and catalytic activity; to explore ligand-free growth of gold nanoparticles (with size less than 5 nm) on the surface of iron oxides by using surface-clean yolk/shell Fe3O4@SiO2 nanoparticles as nanosynthesizer, to analyze the relationship between the size of gold nanoparticles and the cavity volume as well as silica shell thicknesses; to optimize the growth parameters of ultrasmall gold nanoparticles; to investigate the dependence of catalytic activity on the size of iron oxide and gold nanoparticle, the cavity volume, silica shell thicknesses and pore sizes by the mean of cyclohexanol gas phase catalytic oxidation, upon which to optimize the catalytic activity of FeOx-Au@SiO2 nanostructures. There are two advantages in the synthesis of Au nanoparticles by using Fe3O4@SiO2 nanostructure as synthesizers: it can effectively control the size of the gold nanoparticles in the first place, and on the other hand it can avoid the interference of the ligands, making it easier to reveal the catalytic mechanism of the FeOx/Au composite structures. This project will shed some light on further understanding the nature of the catalytic activity of ultrasmall gold nanoparticles, and designing and constructing highly active catalysts, which will provide some basis for the realization of the integration of “synthetic - protection – catalysis” system based on gold nanoparticles.

英文关键词： Yolk/shell structures;Ultrasmall Au nanoparticles;Nanosynthesizer;Catalysis