Magnetically recoverable porphyrin-based nanocatalyst for the effective oxidation of olefins with hydrogen peroxide: a comparative study
In this paper, preparation, characterization and catalytic application of metalloporphyrin-based magnetic nanocatalysts were investigated. meso‐tetrakis(4‐carboxyphenyl) porphyrinatoiron (III) chloride (Fe(TCPP)Cl) and meso-tetrakis(4‐carboxyphenyl) porphyrinatomanganese (III) acetate (Mn(TCPP)OAc) were separately immobilized of onto the surface of amine functionalized magnetic nanoparticles (Fe3O4@SiO2@NH2) via covalent attachment. The obtained nanocatalysts were characterized by FT-IR and UV-Vis and atomic absorption spectroscopy, X-ray powder diffraction (XRD), vibrating sample magnetometry (VSM), thermogravimetric analysis (TGA), transmission electron microscope (TEM). The catalytic efficiency of Fe3O4@SiO2@NH2@Fe(TCPP)Cl and Fe3O4@SiO2@NH2@Mn(TCPP)OAc for the green oxidation of alkenes with H2O2 were investigated in a comparative manner. Mn-porphyrin based magnetic nanocatalyst shows higher catalytic efficiency compared to the Fe--porphyrin. In addition, the prepared magnetic nanocatalyst exhibited excellent reusability and could be reused at least for five times without significant leaching or loss of activity.