微（纳）级介孔羟基磷酸铁负载金催化剂的制备及其催化性能研究

项目名称： 微（纳）级介孔羟基磷酸铁负载金催化剂的制备及其催化性能研究

项目编号： No.21303085

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： 刘俊华

作者单位： 南京师范大学

项目金额： 25万元

中文摘要： 烯烃环氧化物及亚砜类化合物具有重要的经济价值，以较高产率实现烯烃环氧化及硫醚氧化到亚砜反应具有重要学术意义。本项目拟采用反相微乳液-溶剂热合成方法合成新型微（纳）级介孔羟基磷酸铁，以其为载体制备纳米金催化剂，实现环氧化烯烃及亚砜类产物环境友好的高效催化合成。载体丰富的表面碱性羟基利于纳米金的良好分散，与铁组分的可还原性（或可产生大量氧空位，从而增强载体-金协同作用）共同为纳米金催化性能的提高提供了可能，分别建立表面碱性羟基、氧空位与催化性能的构效关系；而介孔微（纳）结构的塑造可以弥补羟基磷酸盐比表面积小、质量传递差的劣势。采用环境友好的反应体系（低温液相反应，环境友好的氧化剂），考察系列纳米金催化剂对于烯烃及硫醚氧化反应的催化性能，探讨载体-金相互作用及纳米金粒径对这些反应的作用机理。本项目将促进羟基磷酸铁的合成及其作为催化载体的应用，对纳米金催化这一重要领域的发展具有一定的意义。

中文关键词： 反相微乳液；溶剂热合成；羟基磷酸铁；纳米金；反应机理

英文摘要： Epoxides and sulfoxides are very useful and versatile intermediates for the synthesis of many commodity and fine chemicals,olefin epoxidation and selective oxidation of sulfides to sulfoxides with high selectivity are subjects of great interest from both academic and industrial points of view.This project is intended to synthesize new types of micro (nano) sized mesoporous reducible iron hydroxyphosphates using inverse microemulsion and solvothermal synthesis technology, then the nano-gold catalysts will be prepared using these materials as supports to achieve environmentally friendly catalytic synthesis for epoxides. The sufficient surface basic hydroxyls are conducive to good dispersion of gold nanoparticles,together with reducible iron components (perhaps yielding large number of oxygen vacancies, so support-gold interactions are strengthened),they will provide higher catalytic performances,then the structure- activity relationships may be established between the basic hydroxyls, oxygen vacancies and the catalytic performance, respectively. While the formation of mesoporous micro (nano) sized structure can solve some disadvantages of the iron hydroxyphosphates, such as the low surface area and the poor mass transfer performance, so the high substrate conversions and desired product selectivities will be obta

英文关键词： Inverse microemulsion；Solvothermal；Ferric hydroxypophosphates；Nano gold；Reaction mechanism