Abstract
The immobilized Vitamin B 12 (Vit-B 12) within the nanoreactors of MCM-41 as molecular sieves was characterized by X-ray powder diffraction (XRD), FT-IR, chemical analysis and nitrogen adsorption–desorption. XRD and N 2 adsorption–desorption isotherms showed that the well ordered hexagonal structure of MCM-41 is presented and surface area, pore volumes and pore diameters decrease after immobilization of Vit-B 12 within nanoreactors of MCM-41. It was found that Vit-B 12/MCM-41 successfully catalyzes the oxygen transfer of tert-butylhydroperoxide (TBHP) to norbornene and trans-2-hexene-1-ol and formation of the corresponding epoxides with 90% reactivity and 100% selectivity. Moreover, cyclohexane, cyclohexene and cyclohexanol are converted to the corresponding alcohols and ketones. On the other hand, styrene undergoes oxidative degradation with the formation of benzaldehyde and benzoic acid.
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