硝基芳烃的连续流催化还原反应及反应机理研究综合实验设计

Comprehensive experimental design of continuous flow catalysis toward nitroaromatics reduction and the reaction mechanism

该实验制备了氮掺杂石墨烯-硅酸铝纤维组装体催化剂,并利用该催化剂构筑了连续流催化系统,研究了其对硝基芳烃的无金属催化还原反应机理。实验以氧化石墨烯、氨水和硅酸铝纤维为原料,经水热法合成了氮掺杂石墨烯-硅酸铝纤维组装体催化填料,通过扫描电子显微镜、透射电子显微镜、X射线光电子能谱等对其结构、形貌和元素组成进行了表征,并通过紫外可见吸收光谱、高效液相色谱和气相-质谱联用研究其催化硼氢化钠还原硝基芳烃的转化率和反应历程。

In this experiment,a nitrogen-doped graphene(NG)-aluminum silicate microfibers(ASMFs)assembly catalyst is prepared.A continuous flow catalytic system is constructed based on the resultant NG-ASMFs catalyst,and its metal-free catalytic reduction mechanism for nitroaromatics is also studied.The NG-ASMFs packing catalyst is synthesized via a hydrothermal method using graphene oxide,ammonium hydroxide and ASMFs as raw materials.Its structure,morphology and elemental composition are characterized by scanning electron microscopy,transmission electron microscopy,and X-ray photoelectron spectroscopy.The conversion and reaction mechanism of nitroaromatics reduction by sodium borohydride are investigated by and UV-visible absorption spectroscopy,high performance liquid chromatography and gas chromatography-mass spectrometry.