论文部分内容阅读
超顺磁性纳米颗粒及其复合材料作为有机反应的催化剂,不仅能通过外加磁场实现催化剂的分离回收,且在反应介质中催化活性位点利用率高,可起到均相催化的效果。本文在系统总结近年来磁性纳米催化剂制备的基础上,阐述了磁性纳米催化剂的制备方法、结构类型和特点。同时,对催化剂在有机合成中的应用和催化效果进行了综述,对磁性纳米催化剂在反应中失活的原因做了详尽分析,展望了超顺磁性纳米颗粒的主要发展方向和今后仍需解决的问题。
Superparamagnetic nanoparticles and their composites as catalysts for organic reactions can not only separate and recover the catalyst through an external magnetic field, but also have a high utilization rate of the catalytically active sites in the reaction medium and can act as a homogeneous catalyst. This article summarizes the preparation of magnetic nanocatalysts in recent years, and elaborates the preparation methods, structure types and characteristics of magnetic nanocatalysts. At the same time, the application of catalyst in organic synthesis and its catalytic effect are reviewed. The reasons for the deactivation of magnetic nano-catalyst in the reaction are analyzed in detail. The main development directions of superparamagnetic nanoparticles and the future need to be solved problem.