基于磷钼钒的离子高分子/Fe_3O_4磁性复合催化剂及其苯羟基化性能

Phosphovanadomolybdate-based Ionic Polymer /Fe_3O_4 Magnetic Composite Catalyst for Hydroxylation of Benzene

合成了一种基于杂多酸的离子高分子磁性复合催化剂Fe3O4@PIL-PMoV,采用红外(FTIR)、热重(TG)、X射线衍射(XRD)、扫描电镜(SEM)和磁化率测试仪(VSM)对其进行了详细的表征,并比较了该催化剂与其他催化剂在苯一步羟基化制苯酚反应中的催化性能。结果表明,Fe3O4@PIL-PMoV是一种高效的苯羟基化固体催化剂,在乙腈溶剂中,苯酚的收率和选择性分别为24.5%和100%;反应结束后,通过外加磁场可实现催化剂的快速分离和重复使用。催化剂优异的催化性能与酸性功能性基团—COOH的溶剂效应以及杂多阴离子特有的"假液相"行为密切相关。

A novel phosphovanadomolybdate-based ionic polymer/Fe3O4 composite catalyst Fe3O4 @ PIL-PMoV was synthesized, and fully characterized by FTIR, TG, XRD, SEM and VSM. Its catalytic performance was investigated in the hydroxylation of benzene to phenol with H2O2. The results demonstrate that Fe3 O4@ PIL-PMoV is a highly efficient heterogeneous solid catalyst for hydroxylation of benzene using CH3 CN as the solvent, and the phenol yield and selectivity were 24. 5% and 100% , respectively. After reaction, the catalyst could be easily recovered by an external magnet and reused directly in the next run. The excellent catalytic performance of the catalyst are closely related to the ＂solvent role ＂ of the functional --COOH groups and the ＂ pseudo-liquid behavior＂ of the heteropolyanion.