Polyoxometalate-based hybrid mesostructured catalysts for green epoxidation of olefins

► Synthesize of α-H3PW12O40·nHMPA and α-H3PMo12O40·nHMPA hybrid polyoxometalates (POM). ► Synthesize of SBA-15 mesoporous silica and its aminopropyl functionalization. ► Immobilization of the newly synthesized hybrid POMs within the mesoporous supports. ► Heterogeneous catalysts used for green epoxidation of olefins; conditions optimized. ► Functional groups of support and POM's acidity play vital role in catalytic activity.