Organometallic-polyoxometalate hybrid based on V-Schiff base and phosphovanadomolybdate as a highly effective heterogenous catalyst for hydroxylation of benzene

• A novel organometallic-polyoxometalate hybrid is prepared.
• The hybrid catalyst leads to the heterogeneous hydroxylation of benzene with H2O2.
• The hybrid catalyst gives high conversion and selectivity.
• The catalyst can be easily recovered and reused.

A novel organometallic-polyoxometalate hybrid has been prepared by anion-exchange of V Schiff base functionalized ionic liquid with V-containing Keggin-type polyoxometalate. The hybrid solid with two types of catalytic active V components demonstrates remarkable capability for heterogeneous hydroxylation of benzene with excellent phenol yield 19.6% and 100% selectivity. After reaction, the catalyst can be simply recovered by filtration and reused at least 4 times without the change of catalyst structure. The synergistic effect between metal Schiff base complex and polyoxometalate plays an important role in the promotion of catalytic activity.

A new organometallic-polyoxometalate hybrid is synthesized and proved to be a highly efficient and steadily reused heterogeneous catalyst for hydroxylation of benzene with H2O2.Figure optionsDownload as PowerPoint slide