The synthesis of novel supported niobium oxide catalysts and their application for aniline conversion to azoxybenzenes is described. The catalysts were successfully prepared by thermal decomposition of layered double hydroxides (LDHs), containing M2+ (M = Mg2+ and/or Zn2+) and Al3+ as layer cations, followed by niobium oxide incorporation employing the wetness impregnation method. These catalysts were
描述了新型的负载型
氧化铌催化剂的合成及其在
苯胺转化为a
氧基
苯中的应用。通过热分解含M 2+(M = Mg 2+和/或Zn 2+)和Al 3+的层状双
氢氧化物(LDHs),成功制备了
催化剂。作为层阳离子,然后采用湿法浸渍法掺入
氧化铌。这些
催化剂通过实验技术和理论计算均得到了充分表征,然后成功地用于将
苯胺选择性转化为a
氧基
苯衍
生物,在紫光存在下,转化率高达98%,分离产率为92%。对照实验和DFT计算表明,该
催化剂在该转化中具有双重作用,在
氧化步骤中既充当
路易斯酸,又在
亚硝基苯中间体的二聚作用中充当光
催化剂。