Host (nanocavity of zeolite-Y or X)–guest (manganese (III) tetrakis[4- N-methylpyridinum]porphyrin) nanocomposite materials as efficient catalysts for biomimetic alkene epoxidation with sodium periodate: Shape-selective epoxidation of linear alkenes

Abstract

Manganese (III) 5,10,15,20- tetrakis(4- N-methylpyridyl) porphyrin encapsulated into zeolite X, [Mn(TMPyP)-NaX], and zeolite Y, [Mn(TMPyP)-NaY] was synthesized through the zeolite synthesis method, in which NaX and NaY zeolites were synthesized around one cationic Mn porphyrin. The syntheses yielded pure MnP-NaX and MnP-NaY catalysts without any by-products blocking the zeolite nanopores. These heterogenized catalysts were characterized by FT-IR, UV–vis spectroscopic techniques, X-ray diffraction (XRD), neutron activation analysis (NAA) and thermal analysis. These catalysts were used for efficient and selective alkene epoxidation with NaIO 4 under mechanical stirring and under ultrasonic irradiation. These catalysts were also used for epoxidation of linear alkenes and good shape selectivity was observed.