The effect of encapsulated Zn-POM on the catalytic activity of MIL-101 in the oxidation of alkenes with hydrogen peroxide

Abstract

Zinc monosubstituted Keggin heteropolyanion [PZnMo₂W₉O₃₉]⁵⁻ was electrostatically bound to nanocages of MIL-101 polymer matrix. The Zn-POM@MIL-101 catalyst was characterized by XRD, N₂ adsorption, atomic absorption (AAS), and FT-IR spectroscopic methods. The catalytic activity of the new composite material, Zn-POM@MIL-101, was assessed in the oxidation of alkenes using aqueous hydrogen peroxide as oxidant. Zn-POM@MIL-101/H₂O₂ catalytic system demonstrated good catalytic activity in the oxidation reactions. Zn-POM@MIL-101 was reusable for three catalytic cycles. While the MIL-101 matrix is an active catalyst in these oxidation reactions, the presence of Zn-POM significantly changed the selectivity and reaction times.

Keywords:

• Metal–organic framework
• MIL-101
• Supported polyoxometalate
• Alkene oxidation
• Hydrogen peroxide
• Nanoporous material

Acknowledgments

The authors would like to acknowledge the Center of Excellence of Chemistry of University of Isfahan (CECUI) in supporting this study.