负载型磁性杂多酸盐/FeO_(x)/rGO催化剂的制备及性能研究

Preparation and properties of polyoxometalate/FeO x/rGO magnetic catalyst

与杂多酸均相催化剂比较,负载型杂多酸催化剂不仅易于回收利用且一定程度上减少了设备腐蚀和环境污染,同时还可以提高催化活性和选择性.本文采用水热法将石墨烯与磁性纳米粒子相结合,制备得到磁性复合载体FeO x/rGO,并将具有较高催化活性的夹心型杂多酸盐Na 14[Zn 2Sb 2(ZnW 9O 34)2]·14H 2O(记为Zn 2Sb 2)通过静电作用均匀地固载到磁性载体上,成功制得一种磁性石墨烯/杂多酸盐复合催化剂FeO x@Zn 2Sb 2/rGO.实验结果表明:该磁性多酸复合催化剂不仅能解决催化剂分离回收的问题,还保持了较高的催化活性和结构稳定性,避免了催化剂活性组分的流失;催化反应结束后,在外加磁场作用下实现了简单、高效的分离.此工作为多酸基纳米催化剂的设计提出了新的思路.

In this paper,graphene is combined with magnetic nanoparticles to prepare magnetic support FeO x/rGO hybrid by hydrothermal method.Afterwards,sandwich type polyoxometalate Na 14[Zn 2Sb 2(ZnW 9O 34)2]·14H 2O(Zn 2Sb 2) with high catalytic efficiency is anchored on the surface of FeO x/rGO support to form magnetic POM-based hybrid nanocatalyst FeO x@Zn 2Sb 2/rGO through electrostatic interaction.It can not only solve the catalyst separation and recovery problems,but also maintain high stability to prevent or slow catalyst deactivation.After the catalytic reaction,a simple and efficient magnetic separation can be achieved under the external magnetic field.These results shed new light on the preparation and recycling of POMs-based nanocatalysts.