负载型Fe四氢席夫碱催化剂的制备、表征及催化性能研究

Preparation,Characterization and Catalytic Properties of Supported Fe Tetrahydro-salen Schiff Base Catalysts

通过共价固载制备Fe四氢席夫碱和Fe席夫碱配合物修饰的氨基功能化石墨烯氧化物有机-无机杂化材料,并将其用于空气氧化苯乙烯环氧化反应中.作为对比,相应的均相配合物在空气氧化苯乙烯环氧化反应中的催化性能进行了测试.通过XRD、FT-IR和TEM等表征手段对新制备的催化剂进行了表征,说明Fe四氢席夫碱和Fe席夫碱配合物已经成功固载到石墨烯氧化物载体上.催化结果发现负载型Fe四氢席夫碱催化剂的活性高于负载型Fe席夫碱催化剂的活性,可能是由于金属离子周围的电子环境不同.此外,这些催化剂重复使用几次后催化活性和选择性没有发生明显变化.

A new type of inorganic-organic hybrid material immobilization of tetrahydro-salen and salen Fe（III）complexes on amino-modified graphene oxide were synthesized by covalent attachment. They were screened as heterogeneous catalysts for aerobic epoxidation of styrene in comparison with the corresponding homogeneous catalysts.All the synthesized heterogeneous catalysts were thoroughly investigated using different characterization techniques,including X-ray diffraction（XRD）,FT-IR and TEM. These results revealed the incorporation of tetrahydrosalen and salen Fe（III）complexes on amino-modified graphene oxide. It was found that graphene oxide tethered tetrahydrosalen Fe（III）complex catalysts were more active than supported salen complex catalysts due to the electronic environment around metal ions. Furthermore,these catalysts exhibited good recoverability without significant loss in activity and selectivity within successive runs.