基于金属氢氧化物负载的纳米金催化剂的制备及构效关系研究

项目名称： 基于金属氢氧化物负载的纳米金催化剂的制备及构效关系研究

项目编号： No.21301107

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 贾春江

作者单位： 山东大学

项目金额： 25万元

中文摘要： 作为纳米催化领域考察催化材料结构和活性依赖关系的标杆催化剂，负载型纳米金催化剂独特的催化性质和广阔的应用前景使其备受关注。研究表明，负载型金催化剂表面羟基对低温催化CO氧化有着直接的促进作用，但其机理尚不明确。而金属氢氧化物材料表面富含羟基，其相应的负载型金催化剂可以为表面羟基对催化剂催化CO氧化活性的影响机理研究提供理想的体系。本项目拟设计合成系列尺寸、形貌与表面可控的低维碱土金属和稀土氢氧化物材料，以其作为载体，通过金纳米颗粒的负载，制备相应的负载型金催化剂；研究此类催化剂低温催化CO氧化的催化行为，并结合理论计算，从实验和理论两方面重点考察载体表面羟基对催化剂结构以及氧分子活化的影响；揭示碱土金属与稀土氢氧化物为载体的负载型金催化剂的结构/微结构特点与其催化性能的内在联系，探索金属氢氧化物材料在多相催化领域的应用前景。

中文关键词： 纳米催化；活性位点；构效关系；催化机理；负载型催化剂

英文摘要： Supported gold nanocatalysts exhibit distinctive catalytic properties in many catalytic reactions, among which, CO oxidation is always used as probe reaction to investigate the catalytic mechanism of gold catalysis. Currently,the surface hydroxyl group effect to enhance the activity of gold catalysts in CO oxidation has attracted great attention, however the the relevant fundamental understanding is still ambiguous. Metal hydroxides supported gold catalysts (Au/M(OH)x) could be ideal target system in which the surface hydroxyl group effect can be more crucial to the resulted catalytic properties due to the large amount of strongly bounded hydroxyl groups in the surface of the support. However, research work related to Au/M(OH)x catalyst is rarely reported. This project aims to synthesize a series of low dimentional metal hydroxides materials, which will then be used as supports to prepare supported gold catalysts. We will further explore the structure-property relationship by combining the experimental investigation and theory calculations, among which the surface hydroxyl group effect to the metal-support interaction and molecular oxygen activation in CO oxidation will be specially investigated. Based on the experimental results and theoretical modulations, the mechanism of surface hydroxy group effect will be

英文关键词： nanocatalysis；active site；structure-function relation；catalytic mechanism；supported catalysts