Host (nanocavity of dealuminated zeolite Y)–guest (12-molybdophosphoric acid) nanocomposite material: An efficient and reusable catalyst for oximation of aldehydes

12-Molybdophosphoric acid (MPA) encapsulated in the supercage of dealuminated zeolite Y (DAZY) was prepared and characterized by infrared spectroscopy (FT-IR), X-ray diffraction (XRD), differential thermal gravimetry (DTG) and atomic absorption spectroscopy (AAS) techniques. The amount of MPA in the supercage of zeolite was 0.0875 g/g of supported catalyst. This catalyst was used for efficient oximation of aldehydes under mechanical stirring, ultrasonic irradiation and solvent-free conditions and the corresponding products were obtained in 65–100% yields. The reaction times were 25–250 min for system under agitation with magnetic stirring, while under ultrasonic irradiation or solvent-free conditions, the oxime yields were increased and the reaction times decreased. The zeolite Y encapsulated 12-molybdophosphoric acid (MPA-DAZY) catalyst was reused several times without loss of its catalytic activity. The amount of Mo leached was less than 2.9%.

Manganes (III) 5,10,15,20-tetrakis(4-N-methylpyridyl) porphyrin encapsulated into zeolite X, and zeolite Y, were synthesized and used as catalysts for epoxidation of cyclic and linear alkenes with NaIO4 under mechanical stirring and ultrasonic irradiation. These catalysts were also used for epoxidation of linear alkenes and good shape selectivity was observed.Figure optionsDownload as PowerPoint slide