TiO2纳米管载金催化剂的微观结构调控及催化CO氧化性能研究

项目名称： TiO2纳米管载金催化剂的微观结构调控及催化CO氧化性能研究

项目编号： No.21301098

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： 朱宝林

作者单位： 南开大学

项目金额： 25万元

中文摘要： 载金催化剂催化CO氧化性能优异，但有关于其微观形貌与宏观活性的关系，及其催化CO氧化的机理有待于深入研究。水热方法所得的钛氧纳米管暴露单一锐钛矿型（101）晶面，符合模型催化剂载体的基本条件。本课题以此纳米管为载体，金为活性组分，利用载体特有的结构和一维介孔的限域作用，在液相体系内，通过调变制备条件和过程，制备金的目标活性晶面充分暴露的CO氧化催化剂；通过理论模拟，建立TiO2纳米管载金催化剂体系中CO的吸附－脱附和O2的吸附解离模型，阐明此体系中CO催化氧化反应的微观机理。通过此课题的实施，揭示催化剂结构与性能的关系，为纳米管负载金催化剂微观结构的目标调控这个关键科学问题的解决，及一维纳米管催化体系中CO氧化的反应机制的探索提供数据及理论参考。

中文关键词： TiO2纳米管；载金催化剂；CO氧化；微结构调控；催化机理

英文摘要： Supported gold catalysts are prominent for their excellent catalytic activity for CO oxidation. But the relationship between the catalysts' microstructure and catalytic avtivity, and the catalytic mechanism of CO oxidation in this catalytic system are still indistinct. The hydrogen titanate nanotubes prepared from hydrothermal process are suitable for support of model catalysts due to their pure (101) plane exposure. In virtue of the hydrogen titanate nanotubes' special structure and its one-dimensional microporous confinement, TiO2 nanotubes-supported gold catalysts for CO xoidation will be prepared by using the titanate nanotubes as support and gold as active component in liquid system. The specially appointed planes of gold will be fully exposed by the experiment condition control. Based on the model and theoretical calculation of CO adsorption-desorption and O2 adsorption-dissociation on the TiO2 nanotubes-supported gold catalysts, the mechanism of CO oxidation in this system will be illuminated. According to the obtained results, the relationship between the structure and catalytic performance can be revealed. It is predictable that some original results related to the microstructure control of the nanotube-supported gold nanocatalysts and the mechanism investigation of CO oxidation are going to be obtained

英文关键词： TiO2 nanotubes；supported gold catalysts；CO oxidation；microstructure control；catalytic mechanism